DIRECT DRIVE
DIGITAL CONTROL
SERVO VALVES
D636 SIZE 03
D637 SIZE 05
HIGH PRODUCTIVITY FOR DEMANDING APPLICATIONS
THAT REQUIRE A HIGHLY DYNAMIC RESPONSE, FLEXIBLE
INTEGRATION AND ADVANCED MAINTENANCE.
Rev. D, May 2019
WHAT MOVES YOUR WORLD
2Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
Whenever the highest levels of motion control performance
and design flexibility are required, you’ll find Moog expertise
at work. Through collaboration, creativity and world-class
technological solutions, we help you overcome your toughest
engineering obstacles. Enhance your machine’s performance,
and help take your thinking further than you ever thought
possible.
This catalog is for users with technical knowledge. To ensure all necessary characteristics for function and safety of the system, the user has
to check the suitability of the products described herein. The products described herein are subject to change without notice. In case of doubt,
please contact Moog.
Moog is a registered trademark of Moog Inc. and its subsidiaries. All trademarks as indicated herein are the property of Moog Inc. and its
subsidiaries. For the full disclaimer refer to www.moog.com/literature/disclaimers.
For the most current information, visit www.moog.com/industrial or contact your local Moog office.
INTRODUCTION .............................................................................. 2
Product Overview ..................................................................... 3
Description of Operation ....................................................... 5
Features and Benefits ............................................................ 7
TECHNICAL DATA .......................................................................... 8
SIZE 03 – D636 SERVO VALVE ............................................ 8
SIZE 05 – D637 SERVO VALVE ..........................................12
Electronics ................................................................................16
BACKGROUND .............................................................................22
Flow Calculation .....................................................................22
Electronics ................................................................................23
Electronics Logic Functions ...............................................24
Fieldbus Interface ..................................................................25
Configuration Software .......................................................26
ORDERING INFORMATION .......................................................27
Accessories and Spare Parts .............................................27
Installation Drawings ............................................................31
Moog Global Support ............................................................33
Ordering Code..........................................................................34
INTRODUCTION
3Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
Moog Digital Control Valves (DCV) are closed-loop
hydraulic products that are used in industrial machinery
to precisely control flow, position, velocity or force using
advanced digital fieldbuses for communication (e.g.
EtherCAT, PROFIBUS-DP, CANopen) or analog interfaces.
For maximum flexibility, customers can choose to have
an analog interface, fieldbus interface or both combined
in the same valve. The D636 and D637 valve series have
world-class, proven technology that makes them the
performance leader in providing advanced functionality
such as higher dynamics, easy parameter tuning and
adaptation of flow characteristics.
With a robust design that offers proven reliability in some
of the world’s most demanding environments such as oil
rigs, offshore wind turbines and steel mills, these valves
can be tailored to your exact performance requirements.
With proven hydraulic motion control and application
expertise, Moog can help you select the version that best
meets your needs.
This Servo Valve series is also available as explosion proof
version with hot-swappable connectors and proven ability
to withstand vibration and heavy use.
PRODUCT OVERVIEW
INTRODUCTION
Spool
Position
Control
s
Command
s
u
s
Spool
F
v
s
Actuator
Control loop consisting of valve with integrated spool position
control and cylinder
F Force
s
Actuator
Actuator position
s
Command
Spool position command signal
s
Spool
Spool position
u Correcting variable
v Velocity
D636 Servo Valve D637 Servo Valve
Valve design 1-stage, with spool and bushing
Size according ISO 4401 03 05
Mounting pattern ISO 4401-03-03-0-05 (with or
without leakage oil connection Y)
ISO 4401-05-05-0-05 (with or
without leakage oil connection Y)
Rated flow at Δp
N
35 bar (500 psi)/spool land 5/10/20/40 l/min
(1.3/2.6/5.3/10.6 gpm)
60/100 l/min
(15.9/26.4 gpm)
Maximum flow 75 l/min (19.8 gpm) 180 l/min (47.6 gpm)
Maximum operating pressure – port P, A, B 350 bar (5000 psi)
Step response time for 0 to 100 % stroke 8 ms 14 ms
4Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
Direct Drive Servo Valves
The D636 and D637 Series Valves, sizes 03 an 05 are
Direct Drive Servo Valves.
The valves are control valves for 2-, 2x2-, 3- and 4-way
applications and are suitable for electrohydraulic control
of position, speed, pressure and force even under high
dynamic requirements.
Design and Application
A permanent magnet linear force motor is used to drive
the spool. In contrast to proportional solenoid drives,
the linear force motor drives the spool in both working
directions from the spring-centered middle position.
The strong actuating force of the spool, provides
Moog Servo Valves with excellent static and dynamic
characteristics.
Digital Electronics
The digital driver and control electronics are integrated in
the valve. The valve electronics contain a microprocessor
system which executes all the important functions via the
valve to be controlled across the full range of operation,
with significantly reduced influence from temperature
and drift.
Fieldbus Interface
A built-in fieldbus interface (e.g CAN open, Profibus-DP
or EtherCAT ) enables operating parameters to be set,
activates the valve and monitors its performance. To
reduce wiring, the fieldbus interface is provided with two
connectors. Thus, valves may be integrated into the bus
without any external T-joints. In addition, up to two analog
input commands and up to two analog actual value outputs
are available.
Optionally, the valves are available without a fieldbus
interface. In this case, the valve is controlled using analog
inputs. Valve parameters are set using the integrated M8
service connector.
Spool Position Control
In this operating mode of the servo valve, the spool position
is controlled. The command signal is proportional to a
desired spool position. A position transducer (LVDT )
measures the spool‘s actual position and forwards this
information to the valve electronics. The electronic system
compares the actual spool position and the command signal,
and generates a signal to drive the linear force motor,
which then brings the spool into the correct position. The
position command can be influenced by parameters in
the valve software (i.e: linearization, ramping, dead band,
sectionally defined amplification, etc).
Optional Valve Features
Moog offers a range of optional features. These include
options to ruggedize valves for operation in extremely
demanding environments, and valves designed for special
applications and fluids. The following sections provide
short overviews of these functions. Please contact Moog
for more detailed information.
Valves for Operation with Ester
Based Fluids
Standard hydraulic seal materials such as HNBR and FKM,
are frequently incompatible with fire resistant phosphate
ester based fluids. In order to use valves with this type
of fluid, Moog offers them as special seal versions that
are mineral oil and phosphate ester resistant. Please note:
These valve types are tested by Moog using mineral oil,
remnants of which will remain in the valve after testing.
Pressure Control
A pressure control function can be added to the valve as
an additional option. These valves provide full pressure (p)
and flow combined with a pressure limiting (pQ) function.
For further information please see our digital control valves
with p and pQ control catalogs.
Axis Control
Optionally, an axis control functionality can be added to
the valve. This enables the valve to close external control
loops, e.g. flow, position, velocity or force control. Data
from external sensors can be read by up to 3 analog inputs
(V/A), an SSI interface or a Wheatstone Bridge.
Please ask us about special versions of our valves.
INTRODUCTION
PRODUCT OVERVIEW
Direct Drive Digital Control Valves with Spool Position Control
5Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
Main Features of Direct Drive Servo Valves with
Integrated Digital Electronics
• Direct drive with permanent magnet linear force
motor that provides high actuating force, works in
2 directions
• Direct operated - no pilot oil required
• Pressure-independent dynamic response
• Low hysteresis and high response characteristics
• Diagnostic capabilities: Integrated monitoring of
important ambient and internal parameters; valve
parameters may be changed on site or remotely
• Flexibility: Since parameters may be downloaded
using the fieldbus or a high level PLC program, valve
parameters may be tuned during a machine cycle while
the machine is operating
• Lower power demand in and around the spool center
position. This results in lower energy consumption
during the majority of operating and stand by times
• If the electrical supply fails, a cable breaks or emergency
stop is activated, the spool returns to the predefined
spring-centered position without passing a fully open
control port position increasing safety
Description of Operation of the Permanent
Magnet Linear Force Motor
The Linear Force Motor (LFM) is a permanent magnet
excited differential motor.
The LFM’s armature (4) is connected to the valve spool
via a rod. Also connected to this rod are the centering
springs (2), which keep the LFM in its center position. The
permanent magnets (1) supply part of the motor’s force.
In combination with the force created by the coil (5), the
force level of a Linear Force Motor is higher than that of a
proportional solenoid of similar size.
The LFM has a neutral mid-position from which it generates
force and stroke in both directions. This is an advantage over
a proportional solenoid drive, which can only operate in one
direction. The LFM’s force is roughly proportional to the coil
current. To move out of the center position, a PWM current
is applied to the coil and the spool is deflected against the
centering springs. To move back towards the center position,
a reverted PWM current is applied to the coil, which causes
the LFM to actively move the spool towards the center. This
movement is supported by the centering springs.
Due to the high force levels of the LFM it is able to overcome
flow and frictional forces and still guarantee a precise and
dynamic positioning of the spool.
D636 Series Direct Drive Servo Valve
P
981011
21
56
7
4
3
12
TA YB
1 Fieldbus connector X4
2 Fieldbus connector X3
3 Valve connector X1
4 Service connector X10
5 Spool
6 Bushing
7 Linear force motor
8 Ports
9 Electronic housing
10 Position transducer (LVDT)
11 Digital electronics
12 LED
D636 Series Linear Motor
21
3564
1 Permanent magnets
2 Centering springs
3 Screw plug
4 Armature
5 Coil
6 Bearing
INTRODUCTION
DESCRIPTION OF OPERATION
6Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
2-way and 2x2-way operation
In 2-way and 2x2-way operation the servo valves can be
used to control the flow in one direction (used as 2-way
throttle valves).
In 2x2-way operation the valve can be used in 2-way
applications for higher flows. It is necessary to connect
ports P with B and A with T externally for this purpose.
4-way and 3-way operation
In 4-way operation the servo valves can be used to control
the flow in ports A and B (used as 4/3-way throttle valves).
Port A or B must be closed in order to obtain 3-way ope-
ration. Leakage port Y must be used if the pressure in tank
port T exceeds a value of 50 bar (725 psi). The valves are
available with zero lap, less than 3 % or 10 % positive
overlap.
Hydraulic Symbols for D636 Servo Valve
INTRODUCTION
DESCRIPTION OF OPERATION
2x2-way operation
TPY
BA
3-way operation with
failsafe option F
TPY
BA
4- way operation with
failsafe option F
TPY
BA
2-way operation
TPY
BA
7Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
INTRODUCTION
Features Benefits
D636 and D637 Series Servo Valves
Direct operated servo valves No pilot oil required, valve dynamics are not dependent on
constant pilot pressure
Linear Force Motor with high force level and push-pull
operation
Precise and dynamic valve operation even at high pressure
drops
Precise spool positioning with low hysteresis and
threshold
High control accuracy for demanding closed loop control
tasks
High valve dynamics Supports highly dynamic control tasks
Spool slides in precisely manufactured and fully hardened
steel bushing
Low internal leakage, high control accuracy and high wear
resistance
Electronics mounted in rubber frame for vibration
isolation
High resistance against shock and vibration in harsh
environments
Electronics components with high energy efficiency and
high temperature resistance
High durability even at high environmental and fluid tem-
peratures
All Digital Control Valves
Moog offers the ability to exactly tailor hardware,
configurations and functionality to the customer’s
application need
Optimize machine performance to gain competitive
advantages
Improved dynamics over traditional proportional valve
technology due to high performance design of hardware
and software
Increases machine performance in areas such as higher
acceleration, improved accuracy, leading to enhanced
machine productivity
Availability of FM, ATEX and IECEx approved versions with
hot-swappable connectors and proven ability to withstand
vibration and heavy use
Proven, reliable product for use in hazardous
environments such as Oil and Gas Production
Reduced cabling and analog input/outputs (I/O) in complex
systems when compared to traditional analog
Save space and costs while obtaining more machine
flexibility
Availability of diagnostic and condition monitoring data in
the valve
Helps customers manage life cycle of the valve in order to
optimize maintenance costs
Factory preset parameters optimized for flow control
functionality
Valves are plug-and-play from the factory, offering
higher accuracy and reducing your risk of installing new
technology
Advanced tuning functionality such as non-linear flow
curves and a variety of other parameters for complex
machine operations via Moog Configuration software
Allows machine optimization and tailoring to exact
customer specifications
FEATURES AND BENEFITS
8Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
General Technical Data
Valve design 1-stage, with spool and bushing
Mounting pattern ISO 4401-03-03-0-05
(with or without leakage oil connection Y)
Installation position Any
Weight 2.5 kg
Storage temperature range -40 to +80 °C (-40 to +176 °F)
Ambient temperature range -20 to +60 °C (-4 to +140 °F)
Vibration resistance 30 g, 3 axis, 10 Hz to 2 kHz
Shock resistance 50 g, 6 directions, 3 ms
MTTF
d
value according to EN ISO 13849-1 150 years
Hydraulic Data
Maximum operating pressure
Port P, A, B 350 bar (5000 psi)
Port T without Y 50 bar (725 psi)
Port T with Y 350 bar (5000 psi)
Port Y Depressurized to tank
1)
Rated flow at Δp
N
35 bar (500 psi)/spool land 5 l/min
(1.3 gpm)
10 l/min
(2.6 gpm)
20 l/min
(5.3 gpm)
40 l/min
(10.6 gpm)
Maximum flow 75 l/min (19.8 gpm)
Leakage flow (rate) (≈ zero lap)
2)
0.15 l/min
(0.04 gpm)
0.3 l/min
(0.08 gpm)
0.6 l/min
(0.16 gpm)
1.2 l/min
(0.32 gpm)
Hydraulic fluid Hydraulic oil as per DIN 51524 parts 1 to 3 and ISO 11158.
Other fluids upon request.
Temperature range -20 to +80 °C (-4 to +176 °F)
Viscosity range
Recommended viscosity range at 38 °C (100 °F) 15 to 100 mm
2
/s (cSt)
Maximum permissible viscosity range at 38 °C (100 °F) 5 to 400 mm
2
/s (cSt)
Recommended cleanliness class as per ISO 4406
For functional safety 18/15/12
For longer service life 17/14/11
Typical Static and Dynamic Data
2)
Step response time for 0 to 100 % stroke 8 ms
Threshold, typical < 0.05 %
Threshold, maximum < 0.1 %
Hysteresis, typical < 0.05 %
Hysteresis, maximum < 0.1 %
Null shift at ΔT = 55 K (131 °F) < 1.5 %
Sample deviation of rated flow < 3 %
1) In order to avoid an emptying of the return line, a back-pressure of 2 bar (29 psi) should be maintained on the T, T1 and Y connections.
2) Measured at 140 bar (2,000 psi) pilot or system pressure, oil viscosity 32 mm
2
/s and oil temperature 40 °C (104 °F)
SIZE 03 – D636 SERVO VALVE
9Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
Electrical Data
Duty cycle 100 %
Degree of protection according to IEC/EN 60529 IP65 with mounted mating plugs
Supply voltage
3)
18 to 32 V
DC
Permissible ripple of supply voltage
4)
±3 V
RMS
Maximum current consumption
5)
1.7 A
Power consumption of the motor in middle position 9.6 W (0.4 A at 24 V
DC
)
Power consumption maximum 28.8 W (1.2 A at 24 V
DC
)
Fuse protection, external, per valve 2 A (slow)
EM compatibility • Emitted interference as per DIN EN 61000-6-4
(CAN open and PROFIBUS-DP)
• Emitted interference as per DIN EN 61000-6-3
(EtherCAT)
• Immunity to interference as per DIN EN 61000-6-2
(evaluation criterion A)
3) All connected circuits must be isolated from the mains supply by „electrical separation“ in accordance with IEC/EN 61558-1 and
IEC/EN 61558-2-6. Voltages must be limited to the safety extra-low voltage range in accordance with EN 60204-1. We recommend
the use of SELV/PELV power packs.
4) Frequency from 50 Hz to 10 kHz
5) Measured at ambient temperature 25 °C (77 °F) and supply voltage 24 V
SIZE 03 – D636 SERVO VALVE
1
8
11
10
9
7
6
4
3
2
3
4
1
(1.9)
47
(0.37)
9.5
(0.21)
5.4
(0.43)
11
(0.49)
12.4
(10.1)
256
(1.9)
49
(2.1)
53.1
(3.2)
79.9
(4.2)
106.9
(4.9)
126
(0.98)
25
(0.12)
3
(0.10)
(4x)2.5
(0.23)
5.8
(0.21)
5.2
Mating connector Removal space
20
(0.79)
104
(4.09)
99
(3.90)
[70]
[(2.76)]
11+PE
[6+PE]
ø
ø
ø
ø
ø
Installation drawing
Note: See section „Installation Drawing Electronic Housing“ for valves with fieldbus interface.
10Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
SIZE 03 – D636 SERVO VALVE
Flow Signal Pressure Signal
Flow signal characteristic
AB
PT
AB
PT
Q
Q
N
[%]
20
0
40
60
80
100
-100
-100 -20-60 20 60 100
-80
-60
-40
-20
Command signal [%]
Pressure signal characteristic – position controlled
P
P
P
AB
[%]
20
0
40
60
80
100
-100
-4 -2 -1-3 3201 4
-80
-60
-40
-20
Command signal [%]
Note: Measured with system pressure p
p
of 140 bar (2,000 psi), oil viscosity 32 mm
2
/s and oil temperature of 40°C (104°F).
Step Response Frequency Response
5/10/20/40 l/min
100
75
0510 15 20
50
25
0
Stroke [%]
Time [ms]
5/10/20/40 l/min
101 100 300
0
-30
-60
-90
-120
-150
-12
-9
-6
-3
0
3
±5%
±10%
±25%
±90%
Amplitude ratio [db]
Phase lag [degree]
Frequency [Hz]
11Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
SIZE 03 – D636 SERVO VALVE
Port Pattern of Mounting Surface
The mounting surface must conform to
ISO 4401-03-03-0-05. Observe mounting length of
minimum 77 mm (3.0 in) and O-ring recesses for Y.
For maximum flow the ports for P, T, A and B must be
designed with Ø 7.5 mm (0.3 in), not according to the
standard.
Evenness of connecting surface has to be 0.01 mm
(0.0004 in) over 100 mm (3.94 in), average surface finish
R
a
better than 0.8 µm (0.0000314 in).
Designation P A B T Y F
1
F
2
F
3
F
4
G
Size Ø mm
in
7.5
0.30
7.5
0.30
7.5
0.30
7.5
0.30
3.3
0.13
M5
M5
M5
M5
M5
M5
M5
M5
4.0
0.16
Position X mm
in
21.5
0.846
12.7
0.5
30.2
1.189
21.5
0.846
40.5
1.594
0
0
40.5
1.594
40.5
1.594
0
0
33
1.299
Position Y mm
in
25.9
1.02
15.5
0.61
15.5
0.61
5.1
0.201
9
0.354
0
0
-0.75
-0.03
31.75
1.25
31
1.22
31.75
1.25
x
y
17
(0.7)
77
(3.0)
0
9,5
(0.4)
52
(2.0)
0
17
(0.7)
77
(3.0)
0
9.5
(0.4)
52
(2.0)
0
F
1
F
2
F
3
F
4
A
B
T
Y
G
P
Typical Characteristic Curves
Flow signal curves at Δp
N
= 35 bar (500 psi) per spool land
Hydraulic Symbol
2x2-way operation
TPY
BA
3-way operation with
failsafe option F
TPY
BA
4-way operation with
failsafe option F
0
020406080
100
R02
R04
R08
R16
Q [l/min (gpm)]
Signal [%]
20 (5.3)
10 (2.7)
30 (8)
40 (10.6)
2-way operation
TPY
BA
TPY
BA
12Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
General Technical Data
Valve design 1-stage, with spool and bushing
Mounting pattern ISO 4401-05-05-0-05
(with or without leakage oil connection Y)
Installation position Any
Weight 7.9 kg
Storage temperature range -40 to +80 °C (-40 to +176 °F)
Ambient temperature range -20 to +60 °C (-4 to +140 °F)
Vibration resistance 30 g, 3 axis, 10 Hz to 2 kHz
Shock resistance 50 g, 6 directions, 3 ms
MTTF
d
value according to EN ISO 13849-1 150 years
Hydraulic Data
Maximum operating pressure
Port P, A, B 350 bar (5000 psi)
Port T without Y 50 bar (725 psi)
Port T with Y 210 bar (3000 psi)
Port Y Depressurized to tank
1)
Rated flow at Δp
N
35 bar (500 psi)/spool land 60 l/min (15.9 gpm) 100 l/min (26.4 gpm)
Maximum flow 180 l/min (47.6 gpm)
Leakage flow (rate) (≈ zero lap)
2)
1.2 l/min (0.32 gpm) 2.0 l/min (0.53 gpm)
Hydraulic fluid Hydraulic oil as per DIN 51524 parts 1 to 3 and ISO 11158.
Other fluids upon request.
Temperature range -20 to +80 °C (-4 to +176 °F)
Viscosity range
Recommended viscosity range at 38 °C (100 °F) 15 to 100 mm
2
/s (cSt)
Maximum permissible viscosity range at 38 °C (100 °F) 5 to 400 mm
2
/s (cSt)
Recommended cleanliness class as per ISO 4406
For functional safety 18/15/12
For longer service life 17/14/11
Typical Static and Dynamic Data
2)
Step response time for 0 to 100 % stroke 14 ms
Threshold, typical < 0.05 %
Threshold, maximum < 0.1 %
Hysteresis, typical < 0.05 %
Hysteresis, maximum < 0.1 %
Null shift at ΔT = 55 K (131 °F) < 1.5 %
Sample deviation of rated flow < 3 %
1) In order to avoid an emptying of the return line, a back-pressure of 2 bar (29 psi) should be maintained on the T, T1 and Y connections.
2) Measured at 140 bar (2,000 psi) pilot or system pressure, oil viscosity 32 mm
2
/s and oil temperature 40 °C (104 °F)
SIZE 05 – D637 SERVO VALVE
13Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
Electrical Data
Duty cycle 100 %
Degree of protection according to IEC/EN 60529 IP65 with mounted mating plugs
Supply voltage
3)
18 to 32 V
DC
Permissible ripple of supply voltage
4)
±3 V
RMS
Maximum current consumption
5)
3.0 A
Power consumption of the motor in middle position 9.6 W (0.4 A at 24 V
DC
)
Power consumption maximum 55.2 W (2.3 A at 24 V
DC
)
Fuse protection, external, per valve 3.15 A (slow)
EM compatibility • Emitted interference as per DIN EN 61000-6-4
(CAN open and PROFIBUS-DP)
• Emitted interference as per DIN EN 61000-6-3
(EtherCAT)
• Immunity to interference as per DIN EN 61000-6-2
(evaluation criterion A)
3) All connected circuits must be isolated from the mains supply by „electrical separation“ in accordance with IEC/EN 61558-1 and
IEC/EN 61558-2-6. Voltages must be limited to the safety extra-low voltage range in accordance with EN 60204-1. We recommend
the use of SELV/PELV power packs.
4) Frequency from 50 Hz to 10 kHz
5) Measured at ambient temperature 25 °C (77 °F) and supply voltage 24 V
SIZE 05 – D637 SERVO VALVE
Installation drawing
1
8
11
10
9
7
5
6
4
3
2
3
4
1
(0.73)
18.6
(0.62)
15.6
(12.3)
312
(0.04)
1.1
(2.9)
73
(2.4)
60
(1.90)
48.2
(0.43)
11
(0.23)
5.8
(3.4)
87.3
(4.1)
105.2
(5.2)
132.2
(5.9)
151
(2.0)
50.3
(1.9)
47
(5x) (2x)
(0.26)
6.5
(0.43)
11
Mating connector Removal space
20
(0.79)
104
(4.09)
99
(3.90)
[70]
[(2.76)]
11+PE
[6+PE]
ø
ø
ø
ø
Note: See section „Installation Drawing Electronic Housing“ for valves with fieldbus interface.
14Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
SIZE 05 – D637 SERVO VALVE
Flow Signal Pressure Signal
Flow signal characteristic
Q
Q
N
[%]
20
0
40
60
80
100
-100
-100 -20-60 20 60 100
-80
-60
-40
-20
AB
PTT1
AB
PTT1
Command signal [%]
Pressure signal characteristic - position controlled
P
P
P
AB
[%]
20
0
40
60
80
100
-100
-4 -2 -1-3 3201 4
-80
-60
-40
-20
Command signal [%]
Note: Measured with system pressure p
p
of 140 bar (2,000 psi), oil viscosity 32 mm
2
/s and oil temperature of 40°C (104°F).
Step Response Frequency Response
60 l/min
100
75
0510 15 3020 25
50
25
0
Stroke [%]
Time [ms]
60 l/min
101 100 300
0
-30
-60
-90
-120
-150
-12
-9
-6
-3
0
3
±5%
±10%
±25%
±90%
Amplitude ratio [db]
Phase lag [degree]
Frequency [Hz]
100 l/min
100
75
0510 15 3020 25
50
25
0
Stroke [%]
Time [ms]
100 l/min
101 100 300
0
-30
-60
-90
-120
-150
-12
-9
-6
-3
0
3
±5%
±10%
±25%
±90%
Amplitude ratio [db]
Phase lag [degree]
Frequency [Hz]
15Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
SIZE 05 – D637 SERVO VALVE
Typical Characteristic Curves
Flow signal curves at Δp
N
= 35 bar (500 psi) per spool land
Hydraulic Symbol
2x2-way operation
TPY
BA
T
1
3-way operation with failsafe
option F
TPY
BA
T
1
4-way operation with failsafe
option F
TPY
BA
T
1
0
020406080
100
R24
R40
Q [l/min (gpm)]
Signal [%]
20 (5.3)
40 (10.6)
60 (15.9)
80 (21.1)
100 (26.4)
2-way operation
TPY
BA
T
1
Port Pattern of Mounting Surface
The mounting pattern must confirm to ISO 4401-05-05-0-05
with additional T
1
. Observe mounting length of minimum
100 mm (3.94 in) and O-ring recesses for Y. For 4-way
valves with Q > 60 l/min (15.9 gpm) the second tank port T
1
is required.
For maximum flow the ports for P, T, T
1
, A and B must be
designed with Ø 11.5 mm (0.45 in), not according to
the standard.
Evenness of connecting surface has to be 0.01 mm
(0.0004 in) over 100 mm (3.94 in), average surface finish
R
a
better than 0.8 µm (0.0000314 in).
YB
P
A
23
(0.9)
100
(3.9)
14.5
(0.6)
75
(3.0)
y
0
x
0
F
1
F
2
F
3
F
4
T
T
1
Designation P A B T T
1
Y F
1
F
2
F
3
F
4
Size Ø mm
in
11.2
0.44
11.2
0.44
11.2
0.44
11.2
0.44
11.2
0.44
6.3
0.25
M6
M6
M6
M6
M6
M6
M6
M6
Position X mm
in
27
1.063
16.7
0.657
37.3
1.469
3.2
0.126
50.8
2
62
2.441
0
0
54
2.126
54
2.126
0
0
Position Y mm
in
6.3
0.248
21.4
0.843
21.4
0.843
32.5
1.28
32.5
1.28
11
0.433
0
0
0
0
46
1.811
46
1.811
16Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
ELECTRONICS
Pin Assignment for Valves with 6-pole + PE Connector, Pin Contacts (X1)
According to EN 175201-804, mating connector (type R or S, metal) with preleading protective earth pin ( )
B
C
D
F
E
A
Pin Pin assignment Signal type
1)
Voltage floating Current floating
2)
A Supply voltage U
Supply
= 24 V
DC
(18 to 32 V
DC
) referenced to GND (reverse polarity protected against GND)
B GND Power ground/signal ground
C Enable input U
CB
> 8.5 to 32 V
DC
referenced to GND: Valve ready for operation (enabled)
U
CB
< 6.5 V
DC
referenced to GND: Valve disabled
The input resistance is 10 kΩ
D Command signal -
spool position
U
in
= U
DE
R
in
= 20 kΩ
I
in
= I
D
= -I
E
R
in
= 200 Ω
I
max
= ±25 mA
E Reference point
Input rated command
Reference for pin D
3)
F Actual value -
spool position
U
F-B
= 2 to 10 V; U
F-B
is proportional to the
spool position; 6 V corresponds to the
spool center position; R
L
= 500 Ω
I
out
= 4 to 20 mA referenced to GND; I
out
is
proportional to the spool position; 12 mA
corresponds to the spool center position;
the output is short-circuit-proof;
R
L
= 0 to 500 Ω
Protective earth (PE) Connected with valve body
1) Signal ranges see next page.
2) Command signals I
in
< 3 mA (due to cable break, for example) indicates a failure of 4 to 20 mA signals. The valve reaction to this
failure may be customized and activated by the customer.
3) The potential difference between pins D or E referenced to pin B must be between -15 and +32 V.
17Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
ELECTRONICS
Ordering Codes and Signals for Valves with 6-pole + PE Connector (X1)
Ordering code Command signal ±100% spool position Actual value ±100 % spool position
M U
D
- U
E
-10 to +10 V I
F
4 to 20 mA
X I
D
-10 to +10 mA I
F
4 to 20 mA
E I
D
4 to 20 mA I
F
4 to 20 mA
D U
D
- U
E
-10 to +10 V U
F
- U
B
2 to 10 V
Note: For more information see Technical Notes TN 353 „Protective Grounding and Electrical Shielding of Valves“ and TN 494
„Maximum Permissible Length of Electric Cables for Valves with Integrated Electronics“. Visit www.moog.com/industrial/literature
to download document.
Note: See inside back cover for complete ordering information.
Command Signal Current Floating,
Ordering Code X or E
The spool position is proportional to I
D
= - I
E
.
For a command signal I
D
= 20 mA (code E) or +10 mA
(code X) the spool moves to 100 % P → A and B → T.
For a command signal I
D
= 12 mA (code E) or 0 mA (code X)
the spool is in the defined center position.
R
in
0 V +24 V
D
E
B
A
I
E
U
DE
Valve
Control
I
Command signal
Supply
Command signal p I
D
Command Signal Voltage Floating,
Ordering Code D or M
The spool position is proportional to U
D
− U
E
.
For a command signal U
D
− U
E
= +10 V the spool moves to
100 % P → A and B → T.
For a command signal U
D
− U
E
= 0 V the spool is in the
defined center position.
GND
R
in
0 V +24 V
D
E
B
A
U
DE
Supply
Control
U
Command signal
Signal
Valve
Command signal p
I
out
R
L
V
U
out
I
out
F
B
(GND)
Valve Spool
position
Actual Value 4 to 20 mA, Ordering Code M, X or E
The signal can be used for monitoring and fault detection
purposes. The spool position is proportional to I
out
. The
spool position corresponds to 4 to 20 mA. At 12 mA the
spool is in center position.
20 mA corresponds to 100 % valve opening P → A and
B → T. A cable fault is detected by I
out
= 0 mA.
Optional use: Actual value U
out
= 2 to 10 V with resistor
R
L
= 500 Ω (0.25 W) provided by customer.
I
out
R
L
V
U
out
I
out
F
B
(GND)
Valve Spool
position
Actual Value 2 to 10 V, Ordering Code D
The signal can be used for monitoring and fault detection
purposes. The spool position is proportional to U
out
. The
spool position corresponds to 2 to 10 V. At 6 V the spool is
in center position.
10 V corresponds to 100 % valve opening P → A and B → T.
A cable fault is detected by U
out
= 0 V.
RL = 500 Ω (0.25 W).
18Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
ELECTRONICS
Pin Assignment for Valves with 11-pole + PE Connector, Pin Contacts (X1)
According to EN 175201-804, mating connector (type E, metal) with preleading protective earth pin ( )
10
54
3
2
9 11
8
7
6
1
Pin Pin assignment Signal type
1)
Voltage floating Current floating
2)
1 Not used
2
3 Enable input U
3-10
> 8.5 to 32 V
DC
referenced to GND: Valve ready for operation (enabled)
U
3-10
< 6.5 V
DC
referenced to GND: Valve disabled
The input resistance is 10 kΩ
4 Command signal -
spool position
U
in
= U
4-5
R
in
= 20 kΩ
I
in
= I
4
= -I
5
R
in
= 200 Ω
I
max
= ±25 mA
5 Reference point
Input rated command
Reference for pin 4
3)
6 Actual value -
spool position
U
6-10
= 2 to 10 V . At 6 V spool is in cente-
red position. R
L
= 500 Ω
4 to 20 mA referenced to GND (I
out
is
proportional to the spool position, 12 mA
corresponds to the valve middle position,
the output is short-circuit-proof);
R
L
= 0 to 500 Ω
7 Not used
8 Digital output -
valve status
U
out
> U
Supply
- 2 V: Valve ready for operation (enabled and supply OK).
U
out
< 2 V: Valve disabled.
Load type: Ohmic, inductive, lamp load.
I
max
= 1.5 A (short-circuit-proof).
9 Supply voltage U
Supply
= 24 V
DC
(18 to 32 V
DC
) referenced to GND (reverse polarity protected against GND)
10 GND Power ground/signal ground (enable and output)
11 Digital output -
error monitoring
U
out
> U
Supply
- 2 V: No error.
U
out
< 2 V: Indicates error
4)
.
Load type: Ohmic, inductive, lamp load.
I
max
= 1.5 A (short-circuit-proof)
5)
.
Protective earth (PE) Connected with valve body
1) Signal ranges see next page.
2) Command signals I
in
< 3 mA (due to cable break, for example) indicates a failure of 4 to 20 mA signals. The valve reaction to this
failure may be customized and activated by the customer.
3) The potential difference between pins 4 or 5 referenced to pin 10 must be between -15 and +32 V.
4) Output can be programmed at the factory, enable function ordering code: K and L - safe position of spool, M and R - command signal/
actual valve deviation, others upon request.
5) The currents drawn at the outputs pin 8 and 11 (referenced to GND) must be added to the valve supply current. The valve fuse must
be configured for the total current.
See inside back cover for complete ordering information.
19Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
ELECTRONICS
Ordering Codes and Signals for Valves with 11-pole + PE Connector (X1)
Note: For more information see Technical Notes TN 353 „Protective Grounding and Electrical Shielding of Valves“ and TN 494
„Maximum Permissible Length of Electric Cables for Valves with Integrated Electronics“. Visit www.moog.com/industrial/literature
to download document.
Note: See inside back cover for complete ordering information.
Ordering code Command signal ±100% spool position Actual value ±100 % spool position
M U
4
- U
5
-10 to +10 V I
6
4 to 20 mA
X I
4
-10 to +10 mA I
6
4 to 20 mA
E I
4
4 to 20 mA I
6
4 to 20 mA
D U
4
- U
5
-10 to +10 V U
6
– U
10
2 to 10 V
Command Signal Current Floating,
Ordering Code X or E
The spool position is proportional to I
4
− I
5
.
For a command signal I
4
= 20 mA (code E) or +10 mA
(code X) the spool moves 100 % P → A and B → T .
For a command signal I
4
= 12 mA (code E) or 0 mA (code X)
the spool is in the defined center position.
Command Signal Voltage Floating,
Ordering Code M or D
The spool position is proportional to U
4
− U
5
.
For a command signal U
4
− U
5
= +10 V the spool moves
100 % P → A and B → T.
For a command signal U
4
− U
5
= 0 V the spool is in the
defined center position.
Actual Value 4 to 20 mA, Ordering Code M, X or E
The signal can be used for monitoring and fault detection
purposes. The spool position is proportional to I
out
. The
spool position corresponds to 4 to 20 mA. At 12 mA the
spool is in center position.
20 mA corresponds to 100 % valve opening P → A and
B → T. A cable fault is detected by I
out
= 0 mA.
Optional use: Actual value U
out
= 2 to 10 V with resistor
R
L
= 500 Ω (0.25 W) provided by customer.
Actual Value 2 to 10 V, Ordering Code D
The signal can be used for monitoring and fault detection
purposes. The spool position is proportional to U
out
. The
spool position corresponds to 2 to 10 V. At 6 V the spool is
in center position.
10 V corresponds to 100 % valve opening P → A and B → T.
A cable fault is detected by U
out
= 0 V.
R
L
= 500 Ω (0.25 W).
R
in
0 V +24 V
4
5
10
9
I
5
U
4-5
Valve
Control
I
Command signal
Supply
Command signal I
4
GND
R
in
0 V +24 V
4
5
10
9
U
4-5
Supply
Control
U
Command signal
Signal
Valve
Command signal
I
out
I
out
R
L
V
U
out
6
10
(GND)
Valve Spool
positon
I
out
I
out
R
L
V
U
out
6
10
(GND)
Valve Spool
position
20Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
ELECTRONICS
Installation Drawings Electronic Housing
Installation Drawing for Valves with Analog
Activation
Ordering code
1)
O: Without fieldbus connector
X1 Valve connector
X10 Service connector
(1.9)(3.4)
(4.9)
(4.2)
(4.9)
(3.1)
(4.2)
48.2
X1
X10
87
124
105.5
124.2
79
106
Installation Drawing for Valves with CANopen
Fieldbus Connector
Ordering code
1)
C: CANopen
X1 Valve connector
X3 Fieldbus connector
X4 Fieldbus connector
(1.9)(3.4)
(0.75)
(1.6)
(4.9)
(5.8)
(4.9)
(4.2)
48.2
X4
X1
87
19
40
124
147
124.2
106
X3
Mating
connector
Removal
space,
fieldbus
20
(0.79)
65
(2.6)
Installation Drawings for Valves with EtherCAT or
PROFIBUS-DP Fieldbus Connector
Ordering code
1)
E: EtherCAT
Ordering code D: PROFIBUS-DP
X1 Valve connector
X3 Fieldbus connector
X4 Fieldbus connector
X10 Service connector
(1.9)(3.4)
(0.75)
(1.6)
(4.9)
(4.2)
(5.8)
(4.9)
(3.1)
(4.2)
48.2
X4
X1
X10
87
19
40
124
105.5
147
124.2
79
106
X3
Mating
connector
Removal
space,
fieldbus
20
(0.79)
65
(2.6)
1) See position 14 on the inside back cover for complete ordering information.
21Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
TECHNICAL DATA
ELECTRONICS
Fieldbus Connectors
CANopen Connectors (X3, X4)
• Ordering Code
1)
C: CANopen
• Coding A
• Thread M12x1
• 5-pole
Pin Signal X3, X4 Description
1 CAN_SHLD Shield
2 CAN_V+ Not connected in the
valve
3 CAN_GND Mass
4 CAN_H Transceiver H
5 CAN_L Transceiver L
External thread, pin contact Internal thread, socket
contact
View on CAN connector X3 View on CAN connector X4
5
4
3
1
2
32
41
5
EtherCAT IN/OUT Connectors (X3, X4)
• Ordering Code
1)
E: EtherCAT
• Coding D
• Thread M12x1
• 4-pole
Pin Signal X4 IN Signal X3 OUT Description
1 TX + IN TX + OUT Transmit
2 RX + IN RX + OUT Receive
3 TX – IN TX – OUT Transmit
4 RX – IN RX – OUT Receive
Internal thread, socket
contact
Internal thread, socket
contact
View on EtherCAT connec-
tor X3
View on EtherCAT
connector X4
3
4
2
1
3
4
2
1
PROFIBUS-DP Connectors (X3, X4)
• Ordering Code
1)
D: PROFIBUS-DP
• Coding B
• Thread M12x1
• 5-pole
Pin Signal X3, X4 Description
1 Profi V+ Power supply 5 V of terminal
resistors
2 Profi A Receive/transmit data –
3 Profi GND Mass
4 Profi B Receive/transmit data +
5 Shield Shield
External thread, pin contact Internal thread, socket
contact
View on PROFIBUS-DP
connector X3
View on PROFIBUS-DP
connector X4
5
4
3
1
2
32
41
5
1)
See inside back cover for complete ordering information.
22Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
BACKGROUND
FLOW CALCULATION
When the valve is open, the prevailing flow is dependent
not only on the spool position, (i.e. the opening cross
section of the valve), but also on the pressure drop at the
individual lands. When the valve is deflected at 100 %,
it delivers the rated flow with the rated pressure drop.
The rated flow of a servo valve corresponds to a pressure
drop of 35 bar (500 psi) per land, equating to 70 bar
(1,000 psi) for two lands. When a valve is opened at 100 %,
the flow can be calculated as a function of the actual
pressure drop with the aid of the formula below or taken
from the diagram.
N
p
p
Q = Q
N
.
Q [l/min (gpm)] actual flow
Q
N
[l/min (gpm)] rated flow
Δp [bar (psi)] actual pressure drop per spool land
Δp
N
[bar (psi)] rated pressure drop per spool land
Flow diagram
100
(1,450)
200
(2,900)
350
(5,000)
p [bar (ps)]
Q [l/min (gpm)]
150 (39.6)
200 (52.8)
100 (26.4)
60(15.9)
80 (21.1)
40 (10.6)
30 (7.9)
20 (5.3)
15 (4.0)
10 (2.6)
8 (2.1)
5 (1.3)
3 (0.8)
2 (0.5)
50
(725)
20
(290)
30
(435)
10
(145)
1
(15)
70
(1,000)
60 (15.9)
40 (10.6)
100 (26,4)
20 (5.3)
10 (2.7)
5 (1.3)
D636-
R02
D636-
R04
D636-
R08
D636-
R16
D637-
R24
D637-
R40
Q
max
= 180 l/min (47.6 gqm)
Q
max
= 75 l/min (19.8 gqm)
The actual flow in the valve ports must not exceed a mean
flow velocity of approximately 30 m/s (96.5 ft/s) due to
the risk of cavitation. When operating the valves close to
these application limits, it is necessary to drill the ports
to the maximum possible diameters (see specifications for
the respective valve).
For ISO 4401 size 05 mounting surfaces the second tank
port must additionally be connected starting from a flow Q
exceeding 60 l/min (15.9 gpm).
23Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
BACKGROUND
ELECTRONICS
Digital Valve Electronics
The valve electronics is based on microprocessor hardware
with corresponding A/D-D/A converters for analog input
and output signals. All functions of the valve are integrated
in the firmware. The digital electronics offer the following
advantages over conventional analog electronics:
• Greater flexibility: Ability to change the valve
parameters easily using configuration software and
the possibility of linearizing flow curves
• Higher reliability due to integrated monitoring
functions
• Easier maintenance due to diagnostic capability and
recording the fault history
• Remote maintenance and setup
Using the optional fieldbus interface cuts down the
amount of wiring needed and eliminates the need for
control interfaces in the PLC.
In the basic version the valve has a standard connector,
and service connector and does not include the fieldbus
interface. In this case the valve is actuated via an analog
command signal.
The service connector offers the possibility to connect the
valve to a PC or Notebook via an USB-to-CAN adaptor (see
accessories). Its CANopen interface offers access to the
valve parameters, which can be changed and monitored, as
well as diagnosing valve performance and possible faults.
The flexibility of the integrated firmware enables the user
to optimize the valve characteristic on-site as required by
the application:
• Adapting the valve flow curve to the needs of the
controlled system
• Adjusting the maximum valve opening separately for
each direction of motion
• Defining fault reactions
The results obtained by the parameter changes can be
viewed and analyzed directly using the built-in data logger.
The parameters optimized during commissioning can be
saved and copied. When the valve is replaced or used for
series applications no tuning is required. The valves are
supplied with a predefined parameter set if required.
Optional Fieldbus Interface
When the valves are operated with a fieldbus, they are
parameterized, activated and monitored via the fieldbus.
CANopen, PROFIBUS-DP or EtherCAT interfaces are
available. Other fieldbus communication protocols are
available upon request. The fieldbus interface is equipped
with two bus connectors (IN/OUT) for cost-effective
wiring. Valves can be integrated directly into the bus
without any external T-joints. The electrically isolated
fieldbus interface ensures reliable data transfer. Data
from additional analog inputs or from SSI and encoders
can be transmitted via fieldbus (inputs available upon
request).
24Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
BACKGROUND
ELECTRONICS LOGIC FUNCTIONS
The onboard electronics of the D636 and D637 Series
Valves are equipped with several logic functions. Short
descriptions of these functions are given in the
following. For more detailed information, please refer to
the Moog technical note TN 435: “Description of Logic
Functions”.
Enable Input
The enable input is used to activate or deactivate the valve
while the electric supply is powered. If the enable input
is switched to HIGH, the valve is in normal operation mode.
If the enable input is switched to LOW, there are two
possible modes:
1. The main spool moves to the defined safe position
P→A or P→B. To achieve this, the control current to
the Linear Force Motor is switched off and the valve’s
spool moves to its spring centered position, which
is about 10 to 20 % open towards P→A or P→B,
or the center position, depending on the option chosen
for pos. 6 of the ordering code.
2. The valve stays in closed-loop control mode and gets
an internal command signal that moves it to its center
position. The external command signal is ignored.
Digital Outputs for Monitoring
The D636 and D637 Series Valves can be equipped with
monitoring functions. Valves with an 11-pole + PE
connector have 2 digital outputs for monitoring functions:
1. Valve Status Output
This output indicates whether the valve is operational.
If the supply voltage is sufficient and the enable signal
is HIGH, the valve status signal is also HIGH. If either
the supply voltage is below 18 V or the enable signal is
LOW, the valve status signal is LOW.
2. Error Monitoring Output
Two options are available for the error monitoring
output:
a) Spool control deviation monitoring: If the control
deviation of the spool controller is larger than
a certain threshold (default is 30 %) for a certain
time, the output is switched to LOW, which indi-
cates an error. As long as the control deviation is
within the threshold, the output is HIGH, indicating
normal operation. This is used to detect if the main
spool is stuck, e.g. due to contamination.
b) Spool position monitoring: This function monitors
whether the spool is within a certain position range.
As long as the spool is within this position range,
the output signal is HIGH. If the spool is outside
this range, the output is switched to LOW. This
can be used, e.g. for safety functions to monitor
whether the spool is within its overlap range or not.
Move spool to spring centered +10% or -10% open position
+ 10%
– 10%
+ 100%
– 100%
Spool position
Time
Enable
HIGH
LOW
Time
A
PB
P
Move spool to center position
-100 %
+100 %
Time
Time
Center
position
LOW
HIGH
Enable
Spool position
Safe spool positions
Flow
Spool position
Overlap with tolerances
Monitoring window with
tolerances
Safe
spool position
with tolerances
25Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
BACKGROUND
FIELDBUS INTERFACE
Modern automation technology is characterized by an
increasing decentralization of processing functions via
serial data communication systems. The use of serial bus
systems in place of analog signal transfer guarantees
greater system flexibility with regard to alterations and
expansions.
There is also considerable potential for saving project
planning and installation costs in many areas of industrial
automation. Further possibilities of parameterization,
better diagnostics and a reduction of the number of
variants are advantages which have only been made
possible by the use of field buses.
VDMA Profile Fluid Power Technology
In a working group within the VDMA (German Machinery
and Plant Manufacturers‘ Association), a device profile
was created in collaboration with numerous well-known
hydraulic system manufacturers. This profile describes
the communication between hydraulic components via
a fieldbus and defines uniform functions and parameters.
In this way, a standardized exchange format covering all
manufacturers was created.
DCVs and ACVs can be equipped with the following
fieldbus interfaces: CANopen, PROFIBUS-DP or EtherCAT.
CANopen
According to ISO 11898, IEC/EN 61800-7 CAN bus was
originally developed for use in automobiles, but has also
been used for years in a variety of industrial applications.
The CAN bus is primarily designed for transmission
reliability and speed.
• The CAN bus has the following general features:
• Multi-master system: Each node can transmit and
receive
• Topology: Line structure with short stub cables
• Network expansion and transmission rates:
- Up to 25 m (80.4 ft) at 1 Mbit/s
- Up to 5,000 m (16,090 ft) at 25 kbit/s
• Addressing type: Message-orientated via identifiers.
Priority assignment of messages possible via
identifiers
• Safety: Hamming distance=6, i.e. up to 6 individual
errors per message are detected
• CiA408: Device profile fluid power technology for
proportional valves and hydrostatic transmissions
• Other used CiA specifications: CiA102, CiA301,
CiA303, CiA305 and CiA306
• Bus physics: ISO 11898
• Maximum number of nodes: 127
PROFIBUS-DP
According to EN 61158, PROFIBUS-DP was developed
for process and manufacturing industries. It is thereby
supported by numerous control system manufacturers.
PROFIBUS-DP has the following features:
• Multi-master system: The masters share access time
and initiate communication. The slaves react only upon
request
• Topology: Line structure with short stub cables
• Network expansion and transmission rates:
- Up to 100 m (321.8 ft) at 12 Mbit/s
- Up to 1,200 m (3,861.6 ft) at 9,6 kbit/s per segment
• Use of repeaters possible
• Addressing type: Address-orientated. Priority/cycle
time assignment of messages via master configuration
• Bus physics: EIA-485
• Maximum number of nodes: 126
EtherCAT
According to IEC 61800-7 EtherCAT was developed as
an industry bus based on Ethernet to meet the increasing
demands for faster cycle times. The EtherCAT bus is
designed for high data transmission rates and fast cycle
times.
The EtherCAT bus has the following features:
• Single-master system: The master initiates communi-
cation. The slaves react only upon request
• Topology: Line, star, tree and ring structure based on
the daisy chain principle
• Network expansion and transmission rates: 100 m
(321.8 ft) between two nodes at 100 Mbit/s
• Addressing type: Address-orientated, one telegram
for all nodes
• Bus physics: Fast Ethernet 100 Base Tx
• Maximum number of nodes: 65,535
26Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
BACKGROUND
CONFIGURATION SOFTWARE
The Windows-based “Moog Valve and Pump Configuration
Software” enables fast and convenient commissioning,
diagnostics and configuration of the valve. It is possible
to transfer data from the PC to the valve or to process
the valve‘s current settings on the PC. The valve can
be controlled by means of graphical control elements.
Status information, command signals, actual values and
characteristic curves are represented in graphical form.
System parameters can be recorded and visualized via an
integrated data logger.
System Requirements
The configuration software can be installed on a computer
with the following minimum requirements:
• PC / Laptop with Windows 7/8.1/10
• Internet Explorer 9
• 1 GB RAM
• 1 GB free hard disk space
• Monitor resolution 1024 x 768 pixels
• Keyboard, mouse
Equipment
The following equipment is also required to be able to use
the software (see also list of accessories):
• USB port
• USB to CAN adapter
• Configuration/commissioning cable
• Adapter for service connector (not required for
CANopen fieldbus)
• Valve electrically connected and power supply
switched on
Note
Configuration or commissioning with the “Moog Valve and
Pump Configuration Software” can be performed via:
• Fieldbus connectors on valves with CANopen fieldbus
• Integrated service connector on valves with PROFI-
BUS-DP or EtherCAT fieldbus or on valves with analog
activation
Download
The software is available free of charge from Moog upon
request. Please visit www.moogsoftwaredownload.com
to download the software.
27Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
ACCESSORIES AND SPARE PARTS
Series-specific Accessories and Spare Parts
Spare Parts Direct Drive DCV - Size 03 - D636 Servo Valve
Part name Description Material Part number
O-ring for ports P, T, A, B 4 pieces,
inner Ø 9.25 mm (0.36 in) x Ø 1.8 mm (0.07 in)
FKM 90 Shore CB35150-013
HNBR 90 Shore B97009-013
O-ring for port Y 1 piece, ID 7.65 x Ø 1.8 (ID 0.3 x Ø 0.07) FKM 90 Shore CB35150-012
HNBR 90 Shore B97009-012
Service sealing set O-rings for ports P, T, A, B, Y FKM 90 Shore B97215-V630F63
HNBR 90 Shore B97215-H630F63
Accessories Direct Drive DCV - Size 03 - D636 Servo Valve
Part name Description Remark Part number
Flushing plate P, A, B, T, X, Y
APBYTX
B46634-002
Mounting screws 4 pieces M5x55, ISO 4762-10.9,
tightening torque 6.8 Nm (60 Ibf in)
A03665-050-055
Shipping plate 1 piece B46035-001
Documents Direct Drive DCV - Size 03 - D636 Servo Valve
Part name Description Remark Part number
ATEX and IECEx
manuals D636 and D638
Series Servo Valves
Manuals Visit www.moog.com/industrial/literature to
download a document using the part number in
a search
CDS29587
Manual D636 and D638
Series Servo Valves
B95872
28Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
ACCESSORIES AND SPARE PARTS
Series-specific Accessories and Spare Parts
Spare Parts Direct Drive DCV - Size 05 - D637 Servo Valve
Part name Description Material Part number
O-ring for ports P, T, T
1
, A, B 5 pieces, inner Ø 12.4 mm (0.49 in)
x Ø 1.8 mm (0.07 in)
FKM 90 Shore CB35150-004
HNBR 90 Shore B97009-004
O-ring for ports X, Y 2 pieces, inner Ø 15,6 mm (0.6 in)
x Ø 1,8 mm (0.07 in)
FKM 90 Shore CB35150-011
HNBR 90 Shore B97009-011
Service sealing set Contains the following O-rings:
• 5 pieces for P, T, T
1
, A, B
inner Ø 12.4 mm (0.49 in) x Ø 1.8 mm (0.07 in)
• 2 pieces for X, Y
inner Ø 15.6 mm (0.61 in) x Ø 1.8 mm (0.07 in)
• 1 piece for filter
inner Ø 12.0 mm (0.47 in) x Ø 2.0 mm (0.08 in)
• 1 piece for filter cover
inner Ø 17.1 mm (0.67 in) x Ø 2.6 mm (0.10 in)
FKM 90 Shore B97215-V681-10
HNBR 90 Shore B97215-H681-10
Accessories Direct Drive DCV - Size 05 - D637 Servo Valve
Part name Description Remark Part number
Flushing plate P, A, B, T, T
1
, X, Y
AP YTX
T
1
B
B67728-001
P, T, T
1
, X, Y
AP YTX
T
1
B
B67728-002
P, T, T
1
and X, Y
AP YTX
T
1
B
B67728-003
Mounting screws 4 pieces M6x60, ISO 4762-10.9,
tightening torque 11 Nm (97 lbf in)
A03665-060-060
Shipping plate 1 piece A40503
Documents Direct Drive DCV - Size 05 - D637 Servo Valve
Part name Description Remark Part number
ATEX and IECEx manuals
D637 and D639 Series
Servo Valves
Manuals Visit www.moog.com/industrial/literature to
download a document using the part number in
a search
CDS29577
Manual D637 and D639
Series Servo Valves
CA61892
29Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
ACCESSORIES AND SPARE PARTS
Series-independent Accessories
Accessories Direct Drive DCV - D636 and D637 Servo Valves
Part name Description Remark Part number
Dust protection
cap for fieldbus
connectors X3, X4
For external thread M12x1,
metal
Required for operation without mating
connector (IP protection)
C55823-001
For internal thread M12x1,
metal
CA24141-001
Dust protection
cap for service
connector X10
For internal thread M8x1,
plastics
CA23105-080-010
Mains power
connection
Power supply cable,
length 2 m (6.4 ft)
B95924-002
SELV power pack
24 V
DC
10 A
D137-003-001
Mating connector Cable with straight mating
connector 11-pole + PE
5, 10, 20 or 25 m, e.g. for 5 m specify
005, other length upon request
C21031-xxx-001
Cable with straight mating
connector 6-pole + PE
C21033-xxx-001
Mating connector, elbow
6-pole + PE
In accordance with EN 175201-804,
type S, metal, IP65, cable Ø 8 to 12 mm
(0.31 to 0.47 in)
B97069-061
Mating connector, straight
11-pole + PE
In accordance with EN 175201-804,
type R, metal, IP65, cable Ø 11 to
13 mm (0.433 to 0.512 in)
B97067-111
Mating connector, straight
6-pole + PE
In accordance with EN 175201-804,
type R, metal, IP65, crimp contact
Ø 0.75 to 1.5 mm
2
(0.0012 to 0.0023 in
2
),
conus Ø 12.2 mm (0.48 in), cable Ø 9 to
12 mm (0.35 to 0.47 in), sealing element
Ø 9 to 13 mm (0.35 to 0.51 in)
B97007-061
Service and
commissioning set
Adapter for service
connector X10, M8x1 to
M12x1
CA40934-001
Configuration/commissioning
cable 2 m (6.4 ft), M12x1 to
EIA-232
TD3999-137
USB to CAN adapter (IXXAT) C43094-001
Moog Valve and Pump
Configuration Software
Download software free of charge at
www.moogsoftwaredownload.com
30Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
ACCESSORIES AND SPARE PARTS
Documents Direct Drive DCV - D636 and D637 Servo Valves
Part name Description Part number
ATEX and IECEx manuals
D636 and D638 Series
Servo Valves
Manuals Visit www.moog.com/industrial/literature
to download a document using the part
number in a search
CDS29587
ATEX and IECEx manuals
D637 and D639 Series
Servo Valves
CDS29577
Installation Instruction
D636, D637, D638 and
D639 Series Servo
Valves
Installation Instructions B97072-636
Manual DCV Electrical
Interfaces
Manuals CA63420
Manual DCV with
CANopen Interface
CDS33853
Manual DCV with
EtherCAT Interface
CDS33722
Manual DCV with
PROFIBUS Interface
CDS33854
Technical Note TN 353 Protective Grounding
and Electrical Shielding
of Hydraulic Valves with
Integrated Electronics
CA58437
Technical Note TN 494 Maximum Permissible
Length of Electric Cables
for Valves with Integrated
Eletronics
CA48851
31Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
ACCESSORIES AND SPARE PARTS
Accessories - Installation Drawings
Mating Connector, Straight 6-pole + PE
In accordance with EN 175201-804, type R, metal, IP65,
crimp contact Ø 0.75 to 1.5 mm
2
(0.0012 to 0.0023 in
2
),
conus Ø 12.2 mm (0.48 in), cable Ø 9 to 12 mm (0.35 to
0.47 in), sealing element Ø 9 to 13 mm (0.35 to 0.51 in)
Part number B97007-061
22, max. 20 Nm
(177 lbf in)
Ø 22
(0.86)
Ø 29
(1.13)
66
(2.60)
20
(0.79)
70
(2.76)
Mating Connector, Elbow 6-pole + PE
In accordance with EN 175201-804, type S, metal, IP65,
cable Ø 8 to 12 mm (0.31 to 0.47 in)
Part number B97069-061
64
(2.53)
Ø 22
(0.86)
10
(0.39)
62
(2.45)
67
(2.64)
Ø 28.8
(1.13)
22, max. 20 Nm
(177 lbf in)
20
(0.79)
32Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
ACCESSORIES AND SPARE PARTS
Accessories - Installation Drawings
Mating Connector, Straight 11-pole + PE
In accordance with EN 175201-804, type R, metal, IP65,
cable Ø 11 to 13 mm (0.433 to 0.512 in)
Part number B97067-111
Ø 24
(0.94)
20
24, max. 20 Nm
(177 lbf in)
92
(3.62)
Ø 28
(1.10)
20
(0.79)
104
(4.09)
33Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
MOOG GLOBAL SUPPORT
Moog Global Support is our promise to offer world-class
Repair and Maintenance Services delivered expertly by our
trained technicians. With the reliability only available from
a leading manufacturer with facilities around the world,
Moog offers you service and expertise you can count on to
keep your equipment operating as it should.
This promise offers many benefits to our customers
including:
• Reduce your downtime by keeping critical machines
running in peak performance
• Protect your investment by ensuring reliability,
versatility and long-life of products
• Better plan your maintenance activities and make
systematic upgrades
• Leverage our flexible programs to meet the unique
service requirements of your facility
Look to Moog for global support including:
• Repair services using OEM parts are performed by
trained technicians to the latest specifications
• Stock management of spare parts and products to
prevent unplanned downtime
• Flexible programs, tailored to your needs such as
upgrades, preventative maintenance and annual/
multi-year contracts
• On-site services bring the expertise to you, providing
quicker commissioning, set-up and diagnostics
• Access to reliable services that are guaranteed to
offer consistent quality anywhere in the world
For more information on Moog Global Support visit
www.moog.com/industrial/service.
34Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
ORDERING CODE
R
02
04
10
O
A
8
H
V
-
7
0
6
F
D
5
1
RK …
2 345678
3
5
08
20
16
40
K
1
4
3
1
2
D
J
Z
X
24
40
2
2
2
4
8
16
24
40
M
350 (5,000)
Model designation
Variant
Valve type
Servo valve with integrated digital electronics
–
Specification status
Series specification
Z
Special specification
D636: Rated flow per spool land [l/min (gpm)]
Pressure range [bar (psi)]
Maximum operating pressure
Bushing/spool design
4-way: 1.5 to 3 % positive overlap, linear flow characteristic
4-way: 10 % positive overlap, linear flow characteristic
Special spool design upon request
4-way: Zero lap, linear flow characteristic
Seal material
Y port
Standard
Linear force motor
Spool position without electrical supply
Series
P
B, A T connected (approximately 10 % open for bushing/spool designs O, A and J)
P
A, B T connected (approximately 10 % open for bushing/spool designs O, A and J)
For = 35 bar (500 psi) pFor = 5 bar (75 psi) p
Model number (assigned at the factory) Type designation
(2.7)
(1.3)
(5.3)
(10.6)
(1.0)
(0.5)
(2.1)
(4.2)
N N
For = 35 bar (500 psi) pFor = 5 bar (75 psi) p
N N
Center position
1)
Closed with screw plug p
Tmax
= 50 bar (725 psi)
100 (26.4)
(6.3)
(10.6)
60 (15.9)
D637: Rated flow per spool land [l/min (gpm)]
D636
Standard
D637
2x2-way: P A and B T, only with Y port
D636 or D637
HNBR
FKM
Other seal material upon request
Open with filter element p
T
>50 bar (725 psi), p
T max
see maximum operating pressure in ordering code position 3
4-way: Zero lap, A:B = 2:1, linear flow characteristic
35Rev. D, May 2019
Moog Direct Drive Digital Control Servo Valves
ORDERING INFORMATION
ORDERING CODE
10
M
X
D
E
9
14
C
D
E
O
11
2
… 2– A1
10 11 12 13 14 15 16
9
13
ABKL MR
X– X– X–
–X–X–X
––XX––
––––XX
12
–
15
O1
K1
16
A1
Y
9
S
E
Fieldbus connector X3, X4
Service connector X10
CANopen
PROFIBUS-DP
5)
EtherCAT
5)
Without fieldbus connector
5)
Enable function
If the enable signal is low:
The spool moves to a closed loop controlled neutral position (the HOLD position).
Supply voltage
24 V
DC
, for more information, see section “Technical Data“
Command signal Actual value
Signals for position control
Valve function
Without
7)
With
6)
Device capability
Spool position closed loop control
± 10 V
± 10 mA
4 to 20 mA
± 10 V
2 to 10 V
4 to 20 mA
4 to 20 mA
Fieldbus
3)
4 to 20 mA
Fieldbus
3)
Others upon request
6-pole + PE EN 175201-804
11-pole + PE EN 175201-804
2)
Valve connector X1
Not used
Monitoring of the safe position of the spool at pin 11
4)
. The range of the safe position
can be freely defined (the default range is around the spring centered position).
HIGH: Within the safe position range
LOW: Outside of the safe position range
Monitoring of the spool control error at pin 11
4)
. The threshold for the spool
control error can be freely defined (the default value is >30 % of maximum
spool stroke after 500 ms).
HIGH: Control error is below the threshold
LOW: Control error is above the threshold
If the enable signal is low: The linear force motor is de-energized.
The spool moves to its spring centered position
(as defined at position 6 of the order code).
2) With monitoring at pin 11
3) Only in conjunction with fieldbus connector “C, D, E“
(changeover to analog signals “M, X, E“ possible)
4) Only in combination with valve connector X1 “E“
5) Valve parameterization with commissioning software “Moog
Valve and Pump Configuration Software“ using M8 service
connector
6) Only in conjunction with fieldbus connector “D, E, O“
7) Only in conjunction with fieldbus connector “C“
WHAT MOVES YOUR WORLD
More Products. More Support.
Moog designs a range of motion control products to complement those featured in this document.
Moog also provides service and support for all of our products. For more information, contact the Moog facility closest to you.
Australia
+61 3 9561 6044
Service + 61 3 8545 2140
info.australia@moog.com
service.australia@moog.com
Brazil
+55 11 3572 0400
info.brazil@moog.com
service.brazil@moog.com
Canada
+1 716 652 2000
info.canada@moog.com
China
+86 21 2893 1600
Service +86 21 2893 1626
info.china@moog.com
service.china@moog.com
France
+33 1 4560 7000
Service +33 1 4560 7015
info.france@moog.com
service.france@moog.com
Germany
+49 7031 622 0
Service +49 7031 622 197
info.germany@moog.com
service.germany@moog.com
Hong Kong
+852 2 635 3200
info.hongkong@moog.com
India
+91 80 4057 6666
Service +91 80 4057 6604
info.india@moog.com
service.india@moog.com
Ireland
+353 21 451 9000
info.ireland@moog.com
Italy
+39 0332 421 111
Service 800 815 692
info.italy@moog.com
service.italy@moog.com
Japan
+81 46 355 3767
info.japan@moog.com
service.japan@moog.com
Korea
+82 31 764 6711
info.korea@moog.com
service.korea@moog.com
Luxembourg
+352 40 46 401
info.luxembourg@moog.com
The Netherlands
+31 252 462 000
info.thenetherlands@moog.com
service.netherlands@moog.com
Russia
+7 8 31 713 1811
Service +7 8 31 764 5540
info.russia@moog.com
service.russia@moog.com
Singapore
+65 677 36238
Service +65 651 37889
info.singapore@moog.com
service.singapore@moog.com
South Africa
+27 12 653 6768
info.southafrica@moog.com
Spain
+34 902 133 240
info.spain@moog.com
Sweden
+46 31 680 060
info.sweden@moog.com
Turkey
+90 216 663 6020
info.turkey@moog.com
United Kingdom
+44 (0) 1684 858000
Service +44 (0) 1684 278369
info.uk@moog.com
service.uk@moog.com
USA
+1 716 652 2000
info.usa@moog.com
service.usa@moog.com
For product information, visit www.moog.com/industrial
For service information, visit www.moogglobalsupport.com
Moog is a registered trademark of Moog Inc. and its subsidiaries.
All trademarks as indicated herein are the property of Moog Inc. and its subsidiaries.
©2018 Moog Inc. All rights reserved. All changes are reserved.
Direct Drive Digital Control Servo Valves
STAR PUBLISHING/Rev. D, May 2019, Id. CDL28329-en
