WHAT MOVES YOUR WORLD
SERVO-PROPORTIONAL
VALVES
DIRECT OPERATED
WITH INTEGRATED
ELECTRONICS
D936 SIZE 03
D937 SIZE 05
PROPORTIONAL SOLENOID OPERATED VALVES
IN 4/4-WAY SLEEVE DESIGN FOR SERVO
QUALITY PERFORMANCE OFFERING HIGH
ROBUSTNESS AND RELIABILITY
Rev. A, September 2022
2Rev. A, September 2022
INTRODUCTION Moog D936 / D937 Servo-Proportional Valves
2
INTRODUCTION
Rev. A, September 2022
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and world-class technological solutions, we help you
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For the most current information, visit www.moog.com/industrial or contact your local Moog ofce.
All dimensions in mm (in)
INTRODUCTION ............................................................................ 2
Product Overview ................................................................... 3
Features and Benets ........................................................... 4
Description of Operation ..................................................... 5
TECHNICAL DATA......................................................................... 6
Size 03 - D936 Servo Valve ................................................. 6
Size 05 - D937 Servo Valve ...............................................15
Electronics ............................................................................... 22
BACKGROUND .............................................................................24
Flow Calculation .....................................................................24
About Moog .............................................................................25
Moog Global Support ...........................................................26
ORDERING INFORMATION ....................................................27
Accessories and Spare Parts ...........................................27
Ordering Code .........................................................................30
CONTACT........................................................................................32
3Rev. A, September 2022
INTRODUCTION Moog D936 / D937 Servo-Proportional Valves
PRODUCT OVERVIEW
3
INTRODUCTION
Rev. A, September 2022
PRODUCT OVERVIEW
Moog D936/D937 Series valves are direct operated
Servo-Proportional Valves driven by a proportional
solenoid. They are equipped with integrated electronics
and closed-loop position control of the spool.
These valves are suitable for electrohydraulic control of
position, speed, pressure and force in open and closed loop
control systems.
These valve series are characterized by a compact design
that allows a space-saving system design.
The robust design allows for a high resistance against
harsh environmental conditions like high vibrations and
temperature.
The valves offer analog interfaces for command signal
and spool position feedback. They are, however, equipped
with modern electronics with a digital core that offers high
energy efciency while delivering high static and dynamic
control performance.
D936 Servo-Proportional Valve D937 Servo-Proportional 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
(without leakage oil connection Y)
Rated flow at Δp
N
35 bar (500 psi)/spool land 4 to 40 l/min (1.06 to 10.6 gpm) 50 or 100 l/min (13.2 or 26.4 gpm)
Maximum operating pressure - port P, A, B 350 bar (5,000 psi)
Step response time for 0 to 100 % stroke 11 ms 18 ms
4Rev. A, September 2022
Moog D936 / D937 Servo-Proportional Valves
FEATURES AND BENEFITS
4Rev. A, September 2022
FEATURES AND BENEFITS
INTRODUCTION
Features Benefits
4/4-way design including failsafe position Reduces need for additional safety components
Servo valve design with fully hardened spool and bushing High accuracy and wear resistance
Electronics mechnically uncoupled from housing
High vibration resistance for longer service life and less
machine downtime
Next-generation electronics with digital core and energy
efcient components
Low thermal stress and long electronics lifecycle
Optimized overlaps and clearances between spool and
bushing
Low internal leakage and high contamination resistance
Electronics placed on the solenoid Compact design for minimum installation space
5Rev. A, September 2022
Moog D936 / D937 Servo-Proportional Valves
DESCRIPTION OF OPERATION
5Rev. A, September 2022
DESCRIPTION OF OPERATION
Valve Design
The Moog D936/D937 Series Servo-Proportional Control
Valves are closed-loop hydraulic products that are used
in industrial applications. These valves are electrical
feedback valves, which means that the position control
loop for the spool is closed by a position transducer and
the integrated valve electronics.
The spool (9) is mounted in a hardened steel bushing (8)
that provides high control accuracy and superior wear
resistance. The spool is deected by the proportional
solenoid (5) that operates against the return spring (7).
The onboard electronics (3) are mounted on top of the
solenoid to create a compact and space-saving valve
shape. The electronics are uncoupled from the electronics
housing and provide a high resistance against vibrations
and shocks.
Operation
An electric command signal (spool position set point) is
applied to the valve electronics via the main connector (1).
A position transducer (4) measures the actual position
of the spool. The electronics compare the spool position
and the command signal, and control the Pulse Width
Modulated (PWM) current to the proportional solenoid.
If a control deviation occurs, the PWM current is changed
to move the spool to the desired position and the PWM
current is kept at a level that holds the spool in this
position.
Thus, the position of the spool is proportional to the
electric command signal.
BPAT
3
4
5
6
7
8
9
2
1
1 Valve connector
2 Electronics housing
3 Valve electronics
4 Position transducer
(LVDT)
5 Proportional solenoid
6 Ports
7 Spring
8 Bushing
9 Spool
D936 Servo-Proportional Valve Cut-away
INTRODUCTION
6Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
6
TECHNICAL DATA
Rev. A, September 2022
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 2.9 kg (6.4 lb)
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
Maximum operating pressure
Port P, A, B 350 bar (5,000 psi)
Port T without Y 280 bar (4,000 psi)
1)
Port T with Y 350 bar (5,000 psi)
Port Y Depressurized to tank
1)
Rated flow at Δp
N
35 bar (500 psi)/spool land for linear
flow characteristics (for others see ordering code)
4 l/min
(1.06 gpm)
12 l/min
(3.2 gpm)
24 l/min
(6.3 gpm)
40 l/min
(10.6 gpm)
Leakage flow (rate) (≈ zero lap)
2)
0.2 l/min
(0.05 gpm)
0.4 l/min
(0.11 gpm)
0.7 l/min
(0.19 gpm)
1.3 l/min
(0.34 gpm)
Maximum allowable pressure drop regarding the transition to the failsafe position
3)
Failsafe options “1“ and “F“ 350 bar
(5,000 psi)
350 bar
(5,000 psi)
350 bar
(5,000 psi)
160 bar
(2,320 psi)
Failsafe option “2“ 350 bar
(5,000 psi)
350 bar
(5,000 psi)
260 bar
(3,770 psi)
120 bar
(1,740 psi)
Hydraulic fluid Hydraulic oil as per DIN 51524 parts 1 to 3 and
ISO 11158. Other uids 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 19/16/13
For longer service life 17/14/11
1) In order to avoid an emptying of the return line, a back pressure of 2 bar (30 psi) should be maintained on the T and Y connections.
2) Measured at 140 bar (2,000 psi) system pressure, oil viscosity 32 mm2/s and oil temperature 40 °C (104 °F)
3) Values apply for 4-way operation, please refer also to the information given in the section “Failsafe Functions”.
D936 SERIES SERVO-PROPORTIONAL VALVES
General Technical Data
Hydraulic Data
7Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
7
TECHNICAL DATA
Rev. A, September 2022
Step response time for 0 to 100 % stroke 11 ms
Threshold < 0.2 %
Hysteresis < 0.2 %
Null shift at ΔT = 55 K (131 °F) < 1.5 %
Sample deviation of rated flow < 3 %
1) Measured at 140 bar (2,000 psi) system pressure, 32 mm
2
/s (32 cSt) oil viscosity and +40 °C (+104 °F) oil temperature.
Duty cycle 100 %
Degree of protection according to IEC/EN 60529 IP65 (with mounted mating connectors)
Supply voltage
2)
24 V
DC
(18 to 32 V
DC
)
Permissible ripple of supply voltage 2.5 V
PP
Maximum current consumption
3)
1.4 A
Maximum power consumption 33.6 W (1.4 A at 24 V
DC
)
Fuse protection, external, per valve 2 A (slow)
EM compatibility • Emitted interference as per DIN EN 61000-6-4
• Immunity to interference as per EN 61000-6-2
(evaluation criterion A)
2) 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.
3) Measured at +25 °C (+77 °F) ambient temperature and 24 V supply voltage
D936 SERIES SERVO-PROPORTIONAL VALVES
Typical Static and Dynamic Data
1)
Electrical Data
8Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
8
TECHNICAL DATA
Rev. A, September 2022
D936 SERIES SERVO-PROPORTIONAL VALVES
TPY
BA
TPY
BA
TPY
BA
Failsafe option “1” Failsafe option “2” Failsafe option “F”
The D936 valve series offers three different fail-safe
options. They can be chosen at position 6 of the ordering
code.
For options “1” and “2” the spool is moved to the 4
th
position by spring force when the electrical supply of the
valve is switched off. Option “1” connects ports A and B
with port T and thus relieves the pressure from ports A
and B. Option “2” blocks all valve ports, but there will still
remain a small amount of internal leakage, so a cylinder or
motor may creep when it is under load.
For option “F” the spool is moved to a stroke of about
110% in the direction P→B and A→T when switching off
the electrical power.
Hydraulic symbols for the different options are shown
below:
Please note:
1) For both options “1” and “2” the spool is moved through the fully open Position P→B and A→T when travelling to the 4th position.
That means there will be full ow for a short period of time.
2) The switching force of the spring is limited, so there are limits concerning the maximum allowable pressure drop to reach the
failsafe position. These limits depend on the rated ow and the failsafe option. Limits for reaching the failsafe position are given on
page 6.
3) The maximum pressure drop for leaving the failsafe position is also limited. In some cases, those limits can be lower than the
pressure drop limits to reach the failsafe position. Depending on the system conguration, it may be necessary to reduce or shut
down the hydraulic supply pressure to leave the failsafe position.
4) For certain errors (e.g. power supply voltage too low), the valve electronics will switch off the solenoid power and the valve will move
to the failsafe position. The solenoid power will be switched on again as soon as the error is no longer present.
Failsafe Functions
9Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
9
TECHNICAL DATA
Rev. A, September 2022
Step Response
1)
Frequency Response
1)
100
75
0510 15 20
50
25
0
Stroke [%]
Time [ms]
101 100 300
0
-30
-60
-90
-120
-150
-12
-9
-6
-3
0
3
±10%
±90%
Amplitude ratio [db]
Phase lag [degree]
Frequency [Hz]
±25%
Pressure Signal Characteristic
P
P
AB
[%]
20
0
40
60
80
-100
-4 -2 -1-3 3201 4
-80
-60
-40
-20
Command signal [%]
Typical Characteristic Curves
D936 SERIES SERVO-PROPORTIONAL VALVES
1) Measured at 140 bar (2,000 psi) system pressure, 32 mm2/s (32 cSt) oil viscosity and +40 °C (+104 °F) oil temperature.
10Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
10
TECHNICAL DATA
Rev. A, September 2022
Linear Flow Characteristics (Bushing/Spool Option “O”)
Rated flow 4 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
1 (0.26)
2 (0.53)
3 (0.79)
4 (1.06)
Rated flow 24 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
8 (2.1)
12 (3,2)
4 (1.06)
16 (4.2)
20 (5.3)
24 (6.3)
Rated flow 12 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
4 (1.06)
6 (1.6)
2 (0.53)
8 (2.1)
10 (2.6)
12 (3.2)
Rated flow 40 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
10 (2.6)
15 (4.0)
20 (5.3)
25 (6.6)
5 (1.3)
30 (7.9)
35 (9.2)
Rated flow at Δp
N
35 bar (500 psi)/spool land
D936 SERIES SERVO-PROPORTIONAL VALVES
11Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
11
TECHNICAL DATA
Rev. A, September 2022
Linear Flow Characteristics for Differential Cylinders (Bushing/Spool Option “J”)
Rated flow 4 l/min
0
100-100 80
TA
AP
TBBP
-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
1 (0.26)
2 (0.53)
3 (0.79)
4 (1.06)
Rated flow 24 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
8 (2.1)
12 (3,2)
4 (1.06)
16 (4.2)
20 (5.3)
24 (6.3)
TA AP
TBBP
Rated flow 12 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
4 (1.06)
6 (1.6)
2 (0.53)
8 (2.1)
10 (2.6)
12 (3.2)
TA AP
TBBP
Rated flow 40 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
10 (2.6)
15 (4.0)
20 (5.3)
25 (6.6)
5 (1.3)
30 (7.9)
35 (9.2)
TA AP
TBBP
D936 SERIES SERVO-PROPORTIONAL VALVES
Rated flow at Δp
N
35 bar (500 psi)/spool land
12Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
12
TECHNICAL DATA
Rev. A, September 2022
Dual Gain Flow Characteristics (Bushing/Spool Option “Y”)
Rated flow 4 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
1 (0.26)
2 (0.53)
3 (0.79)
4 (1.06)
Rated flow 25 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
10 (2.6)
5 (1.3)
15 (4.0)
20 (5.3)
25 (6.6)
Rated flow 15 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
6 (1.6)
3 (0.79)
9 (2.4)
12 (3.2)
15 (4.0)
Rated flow 40 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
10 (2.6)
15 (4.0)
20 (5.3)
25 (6.6)
5 (1.3)
30 (7.9)
35 (9.2)
40 (10.6)
D936 SERIES SERVO-PROPORTIONAL VALVES
Rated flow at Δp
N
35 bar (500 psi)/spool land
13Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
13
TECHNICAL DATA
Rev. A, September 2022
Dual Gain Flow Characteristics for Differential Cylinders (Bushing/Spool Option “E”)
Rated flow 40 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
10 (2.6)
15 (4.0)
20 (5.3)
25 (6.6)
5 (1.3)
30 (7.9)
35 (9.2)
40 (10.6)
TA AP
TBBP
Progressive Flow Characteristics (Bushing/Spool Option “L”)
Rated flow 8 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
2 (0.53)
4 (1.06)
7 (1.8)
6 (1.6)
5 (1.3)
3 (0.79)
1 (0.26)
8 (2.1)
Rated flow 40 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
10 (2.6)
15 (4.0)
20 (5.3)
25 (6.6)
5 (1.3)
30 (7.9)
35 (9.2)
40 (10.6)
Rated flow 20 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
8 (2.1)
4 (1.06)
12 (3.2)
16 (4.2)
D936 SERIES SERVO-PROPORTIONAL VALVES
Rated flow at Δp
N
35 bar (500 psi)/spool land
14Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
14
TECHNICAL DATA
Rev. A, September 2022
The mounting surface must conform to
ISO 4401-03-03-0-05. Please observe a mounting length
of a minimum 77 mm (3.0 in) and O-ring recesses for Y.
For maximum ow the ports for P, T, A and B must be
designed with Ø 7.5 mm (0.3 in), not according to the
standard.
The evenness of the connecting surface has to be 0.01 mm
(0.0004 in) over 100 mm (3.94 in), and average surface
nish 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
0.3
7.5
0.3
7.5
0.3
7.5
0.3
3.3
0.13
M5
M5
M5
M5
M5
M5
M5
M5
4
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)
9,5
(0.4)
52
(2.0)
0
17
(0.7)
77
(3.0)
9.5
(0.4)
52
(2.0)
0
F
1
F
2
F
3
F
4
A
B
T
Y
G
P
D936 SERIES SERVO-PROPORTIONAL VALVES
70
(2.76)
Mating Connector 6+PE
53.7
(2.11)
20
(0.79)
Removal Space
2.5
(0.1)
ø
48.5
(1.91)
5.4
(0.21)
ø
9.5
(0.37)
ø
198
(7.78)
11
(0.43)
174
(6.86)
ø
12.4
(0.49)
4 x ø
54
(2.12)
3
(0.11)
125
(4.92)
100.5
(3.96)
47.5
(1.87)
27
(1.06)
Port Pattern of Mounting Surface
Installation Drawing
15Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
15
TECHNICAL DATA
Rev. A, September 2022
Valve design 1-stage, with spool and bushing
Mounting pattern ISO 4401-05-05-0-05
(without leakage oil connection Y)
Installation position Any
Weight 6.8 kg (15 lb)
Storage temperature range -40 to +80 °C (-40 to +176 °F)
Ambient temperature range -20 to +60 °C (-4 to +140 °F)
Vibration resistance 20 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
Maximum operating pressure
Port P, A, B 350 bar (5,000 psi)
Port T 250 bar (3,600 psi)
1)
Rated flow at Δp
N
35 bar (500 psi)/spool land for linear
flow characteristics (for others see ordering code)
50 l/min
(13.2 gpm)
100 l/min
(26.4 gpm)
Leakage flow (rate) (≈ zero lap)
2)
1.7 l/min
(0.45 gpm)
2.1 l/min
(0.55 gpm)
Maximum allowable pressure drop regarding the transition to the failsafe position
3)
Failsafe options “1” and “F” 350 bar
(5,000 psi)
140 bar
(2,000 psi)
Failsafe option “2” 250 bar
(3,600 psi)
100 bar
(1,450 psi)
Hydraulic fluid Hydraulic oil as per DIN 51524 parts 1 to 3 and
ISO 11158. Other uids 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 19/16/13
For longer service life 17/14/11
1) In order to avoid an emptying of the return line, a back pressure of 2 bar (30 psi) should be maintained on the T connection.
2) Measured at 140 bar (2,000 psi) system pressure, oil viscosity 32 mm2/s and oil temperature 40 °C (104 °F)
3) Values apply for 4-way operation, please refer also to the information given in the section “Failsafe Functions”.
D937 SERIES SERVO-PROPORTIONAL VALVES
General Technical Data
Hydraulic Data
16Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
16
TECHNICAL DATA
Rev. A, September 2022
Step response time for 0 to 100 % stroke 18 ms
Threshold < 0.2 %
Hysteresis < 0.2 %
Null shift at ΔT = 55 K (131 °F) < 1.5 %
Sample deviation of rated flow < 3 %
1) Measured at 140 bar (2,000 psi) system pressure, 32 mm
2
/s (32 cSt) oil viscosity and +40 °C (+104 °F) oil temperature.
Duty cycle 100 %
Degree of protection according to IEC/EN 60529 IP65 (with mounted mating connectors)
Supply voltage
2)
24 V
DC
(18 to 32 V
DC
)
Permissible ripple of supply voltage 2.5 V
PP
Maximum current consumption
3)
2.7 A
Maximum power consumption 65 W (2.7 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
• Immunity to interference as per EN 61000-6-2
(evaluation criterion A)
2) 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.
3) Measured at +25 °C (+77 °F) ambient temperature and 24 V supply voltage
D937 SERIES SERVO-PROPORTIONAL VALVES
Typical Static and Dynamic Data
1)
Electrical Data
17Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
17
TECHNICAL DATA
Rev. A, September 2022
D937 SERIES SERVO-PROPORTIONAL VALVES
TT1P
BA
TT 1P
BA
TT 1P
BA
Failsafe option “1” Failsafe option “2” Failsafe option “F”
The D937 valve series offers three different fail-safe
options. They can be chosen at position 6 of the ordering
code.
For options “1” and “2” the spool is moved to the 4
th
position by spring force when the electrical supply of the
valve is switched off. Option “1” connects ports A and B
with port T and thus relieves the pressure from ports A
and B. Option “2” blocks all valve ports, but there will still
remain a small amount of internal leakage, so a cylinder or
motor may creep when it is under load.
For option “F” the spool is moved to a stroke of about
110% in the direction P→B and A→T when switching off
the electrical power.
Hydraulic symbols for the different options are shown
below:
Please note:
1) For both options “1” and “2” the spool is moved through the fully open Position P→B and A→T when travelling to the 4th position.
That means there will be full ow for a short period of time.
2) The switching force of the spring is limited, so there are limits concerning the maximum allowable pressure drop to reach the
failsafe position. These limits depend on the rated ow and the failsafe option. Limits for reaching the failsafe position are given on
page 15.
3) The maximum pressure drop for leaving the failsafe position is also limited. In some cases, those limits can be lower than the
pressure drop limits to reach the failsafe position. Depending on the system conguration, it may be necessary to reduce or shut
down the hydraulic supply pressure to leave the failsafe position.
4) For certain errors (e.g. power supply voltage too low), the valve electronics will switch off the solenoid power and the valve will move
to the failsafe position. The solenoid power will be switched on again as soon as the error is no longer present.
Failsafe Functions
18Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
18
TECHNICAL DATA
Rev. A, September 2022
100
75
0510 15 302520
50
25
0
Stroke [%]
Time [ms]
101 100 300
0
-30
-60
-90
-120
-150
-12
-9
-6
-3
0
3
±10%
±90%
Amplitude ratio [db]
Phase lag [degree]
Frequency [Hz]
±25%
Pressure Signal Characteristic
P
P
AB
[%]
20
0
40
60
80
-100
-4 -2 -1-3 3201 4
-80
-60
-40
-20
Command signal [%]
Typical Characteristic Curves
D937 SERIES SERVO-PROPORTIONAL VALVES
Step Response
1)
Frequency Response
1)
1) Measured at 140 bar (2,000 psi) system pressure, 32 mm2/s (32 cSt) oil viscosity and +40 °C (+104 °F) oil temperature.
19Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
19
TECHNICAL DATA
Rev. A, September 2022
Linear Flow Characteristics (Bushing/Spool Option “O”)
Linear Flow Characteristics for Differential Cylinders (Bushing/Spool Option “J”)
Rated flow 50 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
45 (11.9)
25 (6.6)
35 (9.2)
15 (4.0)
5 (1.3)
Rated flow 50l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
45 (11.9)
25 (6.6)
35 (9.2)
15 (4.0)
5 (1.3)
TA AP
BP TB
Rated flow 100 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
100 (26.4)
90 (23.8)
80 (21.1)
70 (18.5)
60 (15.9)
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
Rated flow 100 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
90 (23.8)
80 (21.1)
70 (18.5)
60 (15.9)
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
TA AP
BP TB
D937 SERIES SERVO-PROPORTIONAL VALVES
Rated flow at Δp
N
35 bar (500 psi)/spool land
20Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
20
TECHNICAL DATA
Rev. A, September 2022
Dual Gain Flow Characteristics (Bushing/Spool Option “Y”)
Rated flow 50 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
45 (11.9)
25 (6.6)
35 (9.2)
15 (4.0)
5 (1.3)
Rated flow 50 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
45 (11.9)
25 (6.6)
35 (9.2)
15 (4.0)
5 (1.3)
TA AP
TB BP
Rated flow 100 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
100 (26.4)
90 (23.8)
80 (21.1)
70 (18.5)
60 (15.9)
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
Rated flow 100 l/min
0
100-100 80-80 -60 60-40 40-20 200
Signal [%]
90 (23.8)
80 (21.1)
70 (18.5)
60 (15.9)
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
TA AP
TB BP
D937 SERIES SERVO-PROPORTIONAL VALVES
Dual Gain Flow Characteristics for Differential Cylinders (Bushing/Spool Option “E”)
Progressive Flow Characteristics (Bushing/Spool Option “L”)
Rated flow 100 l/min
0
100-100 80-80 -60 60-40 40-20 200
Q [l/min (gpm)]
Signal [%]
100 (26.4)
90 (23.8)
80 (21.1)
70 (18.5)
60 (15.9)
50 (13.2)
30 (7.9)
40 (10.6)
20 (5.3)
10 (2.6)
Rated flow at Δp
N
35 bar (500 psi)/spool land
21Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
21
TECHNICAL DATA
Rev. A, September 2022
The mounting surface must conform to
ISO 4401-05-05-0-05. Please observe a mounting length
of a minimum 100 mm (3.94 in).
For Q > 60 l/min (15.9 gpm) the second tank port T1 is
required.
For maximum ow the ports for P, T, T1, A and B must be
designed with Ø 11.5 mm (0.45 in), not according to the
standard.
The evenness of the connecting surface has to be 0.01 mm
(0.0004 in) over 100 mm (3.94 in), and average surface
nish R
a
better than 0.8 μm (0.0000314 in).
Designation P A B T T1 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
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
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
23.5
1.28
23.5
1.28
0
0
0
0
46
1.811
46
1.811
D937 SERIES SERVO-PROPORTIONAL VALVES
B
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
73.5
(2.89)
257.1
(10.12)
215.2
(8.47)
15.7
(0.62)
5 x ø
80.6
(3.17)
155.8
(6.13)
131.3
(5.17)
50.3
(1.98)
47
(1.85)
11
(0.43)
ø
6.5
(0.26)
ø
94,7
(3.73)
70
(2.76)
20
(0.79)
Mating Connector 6+PE
Removal Space
Port Pattern of Mounting Surface
Installation Drawing
22Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
ELECTRONICS
22
TECHNICAL DATA
Rev. A, September 2022
ELECTRONICS
Pin Assignment for Valves with 6-pole + PE Connector, Pin Contacts
According to EN 175201-804, mating connector (type R or S, metal) with leading protective earth pin ( )
B
C
D
F
E
A
Pin Pin assignment Signal type
1)
Voltage oating Current oating
2)
A Supply voltage U
A-B
= 24 V
DC
(18 to 32 V
DC
) referenced to GND (reverse polarity protected against
GND)
B GND Power ground/signal ground
C Reference point
actual value
Reference for Pin F
D Command signal -
spool position
U
in
= U
D-E
R
in
= 10 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
2)
F Actual value -
spool position
U
F-C
= -10 to 10 V; U
F-C
is proportional to
the spool position; 0 V corresponds to the
spool center position
I
out
= 4 to 20 mA referenced to PIN C; 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) The potential difference between pins D or E referenced to pin B must be between -15 and +32 V.
23Rev. A, September 2022
TECHNICAL DATA Moog D936 / D937 Servo-Proportional Valves
ELECTRONICS
23
TECHNICAL DATA
Rev. A, September 2022
ELECTRONICS
Ordering Codes and Signals for Valves with 6-pole + PE Connector
Ordering code
position 10
Command signal ±100% spool position Actual value ±100 % spool position
H U
D
- U
E
-10 to +10 V U
F
- U
C
-10 to +10 V
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
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 dened center position.
Command Signal Voltage Floating,
Ordering Code H
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
dened center position.
R
in
0 V +24 V
D
E
B
A
I
E
U
DE
Valve
Control
I
Command signal
Supply
Command signal I
D
GND
R
in
0 V +24 V
D
E
B
A
U
DE
Control
U
Command signal
Signal
Valve
Command signal
Actual Value 4 to 20 mA,
Ordering Code 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.
Actual value U
out
= 2 to 10 V with resistor RL = 500 Ω
(0.25 W) provided by the customer.
I
out
R
L
V
U
out
I
out
F
C
(GND)
Valve Spool
position
Actual Value -10 to +10 V,
Ordering Code H
The spool position is proportional to Uout. The spool
position corresponds to -10 to +10 V. At 0 V the spool is in
center position.
+10 V corresponds to 100 % valve opening P → A and B → T.
U
out
R
L
V
U
out
I
out
F
C
Valve Spool
position
24Rev. A, September 2022
BACKGROUND Moog D936 / D937 Servo-Proportional Valves
FLOW CALCULATION
24
BACKGROUND
Rev. A, September 2022
FLOW CALCULATION
When the valve is open the prevailing ow 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 deected at 100 %, it
delivers the rated ow with the rated pressure drop. The
rated ow 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 ow
can be calculated as a function of the actual pressure drop
with the aid of the formula below, or it can be taken from
the diagram.
Q [l/min (gpm)] actual ow
Q
N
[l/min (gpm)] rated ow
Δp [bar (psi)] actual pressure drop for two lands
Δp
N
[bar (psi)] rated pressure drop for two lands
D936/D937 Flow Chart
When operating the valves close to these application
limits, it is necessary to drill the ports to the maximum
possible diameters (see “Port Pattern of Mounting
Surface” on page 14 for the D936 valves and page 23 for
the D937 valves).
Q =
Q
N
.
p
p
N
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)
8 (2.1)
5 (1.3)
3 (0.8)
2 (0.5)
1 (0.26)
10 (2.6)
0.1 (0.03)
50
(725)
20
(290)
30
(435)
10
(145)
1
(15)
70
(1,000)
4 (1.3)
12 (3.2)
24 (6.3)
40 (10.6)
100 (26.4)
D936-R04
D936-R12
D936-R24
D936-R40
D937-R50
D937-R100
50 (13.2)
25Rev. A, September 2022
BACKGROUND Moog D936 / D937 Servo-Proportional Valves
ABOUT MOOG
25
BACKGROUND
Rev. A, September 2022
ABOUT MOOG
Hydraulic Solutions
Since Bill Moog invented the rst commercially viable
servo valve in 1951, Moog has set the standard for world-
class hydraulic technology. Today, Moog products are
used in a variety of applications - providing high power,
enhanced productivity and ever better performance for
some of the worlds most demanding applications.
Electric Solutions
Clean operation, low noise generation, less maintenance
and reduced power consumption make Moog electric
solutions ideal for applications worldwide. Moog is
the ideal partner for applications where transitioning
technologies requires special expertise.
Hybrid Solutions
By incorporating the advantages of existing hydraulic
and electric technologies - including modular exibility,
increased efciency and cleanliness - into innovative
hybrid solutions, Moog offers new performance potential
in specialized applications.
Flight Simulation
Simulation Table
26Rev. A, September 2022
BACKGROUND Moog D936 / D937 Servo-Proportional Valves
MOOG GLOBAL SUPPORT
26
BACKGROUND
Rev. A, September 2022
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 benets 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 exible 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 specications
• Stock management of spare parts and products to
prevent unplanned downtime
• Flexible programs, tailored to your needs such as
upgrades, preventative maintenance and annual/
multiyear 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
27Rev. A, September 2022
ORDERING INFORMATION Moog D936 / D937 Servo-Proportional Valves
ACCESSORIES AND SPARE PARTS
27
ORDERING INFORMATION
Rev. A, September 2022
ACCESSORIES AND SPARE PARTS
D936 Accessories and Spare Parts
Spare Parts
Part name Description Material Part number
Service sealing set O-rings for ports P, T, A, B, Y, consisting of:
4 pieces inner Ø 9.25 mm (0.36 in) x Ø 1.8 mm (0.07 in)
1 piece inner Ø 7.65 mm (0.3 in) x Ø 1.8 mm (0.07 in)
FKM 90 Shore B97215-V630F63
HNBR 90 Shore B97215-H630F61
Accessories
Part name Description Remark Part number
Mating connector Cable with straight mating
connector 6-pole + PE
5, 10, 20 or 25 m, e.g. for 5 m
specify 005, other length upon request
C21033-xxx-001
Mating connector, elbow
6-pole + PE
In accordance with EN 175201-804, type S,
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 8 to 12 mm (0.31 to 0.47 in),
sealing element Ø 9 to 13 mm (0.35 to 0.51 in)
B97069-061
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 8 to 12 mm (0.31
to 0.47 in), sealing element Ø 9 to 13 mm
(0.35 to 0.51 in)
B97007-061
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
Part name Description Remark Part number
Mounting and Installation
Instruction D936/D937
Series Valves
Installation Instructions Visit www.moog.com to
download a document using the
part number in a search
B97072-936
Technical Note TN 353 Protective Grounding and Electrical
Shielding of Hydraulic Valves with
Integrated Electronics
Visit www.moog.com to
download a document using the
part number in a search
CA58437
Technical Note TN 494 Maximum Permissible Length of
Electric Cables for Valves with
Integrated Eletronics
Visit www.moog.com to
download a document using the
part number in a search
CA48851
28Rev. A, September 2022
ORDERING INFORMATION Moog D936 / D937 Servo-Proportional Valves
ACCESSORIES AND SPARE PARTS
28
ORDERING INFORMATION
Rev. A, September 2022
ACCESSORIES AND SPARE PARTS
D937 Accessories and Spare Parts
Spare Parts
Part name Description Material Part number
Service sealing set O-rings for ports P, T, T1, A, B, Y, consisting of:
5 pieces inner Ø 12.4 mm (0.49 in) x Ø 1.8 mm (0.07 in)
2 pieces inner Ø 15.6 mm (0.61 in) x Ø 1.8 mm (0.07 in)
FKM 90 Shore B97215-V681-10
HNBR 90 Shore B97215-H681-10
Accessories
Part name Description Remark Part number
Mating connector Cable with straight mating
connector 6-pole + PE
5, 10, 20 or 25 m, e.g. for 5 m
specify 005, other length upon request
C21033-xxx-001
Mating connector, elbow
6-pole + PE
In accordance with EN 175201-804, type S,
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 8 to 12 mm (0.31 to 0.47 in),
sealing element Ø 9 to 13 mm (0.35 to 0.51 in)
B97069-061
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 8 to 12 mm (0.31
to 0.47 in), sealing element Ø 9 to 13 mm
(0.35 to 0.51 in)
B97007-061
Mounting screws 4 pieces M6x60,
ISO 4762-10.9, tightening
torque 11 Nm (97 Ibf in)
A03665-060-060
Shipping plate 1 piece A40503
Documents
Part name Description Remark Part number
Mounting and Installation
Instruction D936/D937
Series Valves
Installation Instructions Visit www.moog.com to
download a document using the
part number in a search
B97072-936
Technical Note TN 353 Protective Grounding and Electrical
Shielding of Hydraulic Valves with
Integrated Electronics
Visit www.moog.com to
download a document using the
part number in a search
CA58437
Technical Note TN 494 Maximum Permissible Length of
Electric Cables for Valves with
Integrated Eletronics
Visit www.moog.com to
download a document using the
part number in a search
CA48851
29Rev. A, September 2022
ORDERING INFORMATION Moog D936 / D937 Servo-Proportional Valves
ACCESSORIES AND SPARE PARTS
29
ORDERING INFORMATION
Rev. A, September 2022
ACCESSORIES AND SPARE PARTS
Accessories - Connectors
D936/D937 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 8 to 12 mm (0.31 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)
D936/D937 Mating Connector, Elbow 6-pole + PE
In accordance with EN 175201-804, type S, 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 8 to 12 mm (0.31 to
0.47 in), sealing element Ø 9 to 13 mm (0.35 to 0.51 in)
Part number B97069-061
(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)
30Rev. A, September 2022
ORDERING INFORMATION Moog D936 / D937 Servo-Proportional Valves
ORDERING CODE
30
ORDERING INFORMATION
Rev. A, September 2022
ORDERING CODE
Model designation
Valve type
Servo-proportional valve with integrated digital electronics
Rated flow per spool land [l/min (gpm)]
1)
Pressure range [bar (psi)]
Maximum operating pressure
7
Size
Size 05
6
Size 03
Bushing/spool design
1)
4-way: zero lap, linear flow characteristic
Y portSize
Proportional solenoid on B side
Proportional solenoid
Spool position without electrical supply
Ports P, A, B and T blocked
P
B, A T connected
ForSize = 35 bar (500 psi)
pFor = 5 bar (75 psi) p
Model number (assigned at the factory) Type designation
(1.06)
(2.1)
(3.2)
(0.4)
(0.8)
(1.2)
20
15
24
25
(5.3)
(4.0)
(6.3)
(6.6)
(2.0)
(1.5)
(2.4)9.1
(2.5)
40
(10.6)
(4.0)
N N
Port P blocked, ports A and B connected to T
No Y port, p
Tmax
= 280 bar (4,000 psi)
D93
No Y port, p
Tmax
= 250 bar (3,625 psi)
1.5
3.0
4.5
5.7
7.6
9.5
15.1
R
04
4
O
4-way: zero lap, dual gain flow characteristic
Y
--
7
0
6
2
F
5
1
RK9 …
234 567
0
With Y port, p
Tmax
= 350 bar (5,000 psi)
Not available
D936
D937
D936
D937
3
08
8
12
12
K
9
4
3
1
2
4-way: zero lap, progressive flow characteristic
L
4-way: zero lap, linear flow characteristic, A:B = 2:1
J
4-way: zero lap, dual gain flow characteristic, A:B = 2:1
E
1
350 (5,000)
15
20
24
25
40
50
(13.2)
(5.0)
100
(26.4)
(10,0)
18.9
37.8
50
99
D936
D936
D936
D936
D936
D936
D936
D936
D937
D937
3
31Rev. A, September 2022
ORDERING INFORMATION Moog D936 / D937 Servo-Proportional Valves
ORDERING CODE
31
ORDERING INFORMATION
Rev. A, September 2022
ORDERING CODE
8
H
V
… S
8
2O–
10 11 13
9
10
H
X
E
11
2
13
O
9
S
Enable function
No enable signal
Rated Flow
(Pos. 2)
Series
Flow Characteristics (Pos. 4)
OYE L
04 XX
08 X
12 X
15 X
20 X
24 X
25 X
40 XXXX
99 XXXX
50
D936
D936
D936
D936
D936
D936
D936
D936
D937
D937 X
J
X
X
X
X
X
X XX
Supply voltage
24 V
DC
, for more information, see section “Electronics“
Command signal Actual value
Command signals
± 10 V
± 10 mA
± 10 V
4 to 20 mA
4 to 20 mA
4 to 20 mA
6-pole + PE EN 175201-804
Valve connector X1
Seal material
HNBR
Note: Preferred options marked in bold.
FKM
1) Combinations of Rated Flows and Flow Characteristics
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D936/D937 Servo-Proportional Valves
SMM/Rev. A, September 2022, CDL58904-en