WHAT MOVES YOUR WORLD
SERVO VALVES
PILOT OPERATED
FLOW CONTROL VALVE
WITH ANALOG INTERFACE
72 SERIES
ISO 10372-06-05-0-92
HIGH PERFORMANCE, TWO-STAGE DESIGN PROVIDING
FLOW CONTROL IN A SIMPLE, RUGGED, DEPENDABLE,
LONGLIFE DESIGN
Rev. AB, April 2024
2Rev. AB, April 2024
Moog 72 Series Flow 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 in this document 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
INTRODUCTION ..........................................................................2
Product Overview ..............................................................3
Description of Operation ...............................................5
TECHNICAL DATA .....................................................................6
72 Series Servo Valves...................................................6
Installation Drawings ........................................................10
Mounting Requirements .................................................. 12
Electrical Connection .......................................................13
BACKGROUND ............................................................................14
Flow Calculation .................................................................14
ORDERING INFORMATION ....................................................15
Accessories and Spare Parts ....................................... 15
Related Products ...............................................................16
About Moog ..........................................................................17
Ordering Code .....................................................................19
3Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
The 72 Series flow control servo valves are throttle valves
for 3 and preferably 4-way applications. They are a high
performance, 2-stage design that covers the range of rated
flows from 95 to 225 l/min (25 to 60 gpm) at 35 bar
(500 psi) valve pressure drop per spool land.
The output stage is a closed center, four-way sliding
spool. The pilot stage is a symmetrical double-nozzle
and flapper, driven by a double air gap, dry torque motor.
Mechanical feedback of spool position is pro vid ed by a
cantilever spring. The valve design is simple and rugged for
de pendable, long life op era tion.
These valves are suitable for electrohydraulic position,
speed, pressure or force control systems with high dynamic
response requirements.
The 72 Series is ideally suited for applications in the 95
to 225 l/min (25 to 60 gpm) when superior dynamics are a
must.
Intrinsically safe valve versions are available for use in
applications with potentially hazardous environments.
Specific models are certified to FM, ATEX, CSA, TIIS and
IECEx standards.
INTRODUCTION
PRODUCT OVERVIEW
Valve design 2-stage, with spool and bushing and dry torque motor
Mounting pattern ISO 10372-06-05-0-92
Maximum operating pressure - ports P, A, B and X • Aluminium body: 210 bar (3,000 psi)
• Steel body: 350 bar (5,000 psi)
• Filterless body: 490 bar (7,000 psi)
Maximum operating pressure - port T 210 bar (3,000 psi)
Pilot valve Nozzle flapper
Rated flow at Δp
N
35 bar/spool land (500 psi/spool land) 95 to 225 l/min (25 to 60 gpm)
Step response time for 0 to 100 % stroke 95 l/min: 11 ms
150 l/min: 18 ms
225 l/min: 33 ms
Intrinsically safe and explosion proof valve versions are available for use in potentially hazardous environments. Specific
models are certified to FM, ATEX, CSA, TIIS and IECEx standards. Contact Moog for details.
TIIS
Documents
Part name Description Remark Moog part number
Catalog 72 series general information To download document
click here or scan below:
CDL6266
Manual -072 CDS6211
-072K intrinsically safe Series CDS6754
Installation drawing -072 Series CA79668
-072K intrinsically safe Series CA33638
-072 filterless Series CA35144
4Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
INTRODUCTION
FEATURES AND BENEFITS
Features Benefits
100 % factory tested to ensure critical specification
performance
Ensures smooth and easy startup, reduces downtime and
insures long life in critical industrial applications
2-stage design Enables high machine performance, faster cycle times and
greater accuracy – all resulting in higher productivity
Dual coil torque motor Redundancy for high reliability
Dual precision nozzles in torque motor Precision flow control and predictability
Dry torque motor design Eliminates potential contamination issues in the air gaps
of the torque motor that could cause machine downtime
Hardened 440C bushing and spool Provides for high life, wear resistance when used in the
harsh environments; provides for low sliding friction
during use
Carbide, ball-in-hole feedback mechanism Extends lifetime of servo valve when compared to slotted
spool and sapphire ball designs
Emergency fail-safe positioning Most valves are set up to return to a fail-safe position
when the command signal is interrupted or eliminated
Field replaceable pilot stage filter Enables preventive maintenance in the field, saving
precious machine downtime and service costs
External null bias adjustment Enables technicians to manually adjust the null bias of
the valve to adapt to the conditions of the machine.
This feature provides a simple adjustment to machine
performance without the need to adjust a controller.
Standard field configurable 5th port for separate pilot
supply
Provides for the precise control of low pressure
applications and allows adaptability in service.
Many customizable options available High adaptability to many applications.
Compliant to SAE-ARP-490 Valve Design Standard Electrohydraulic Servo Valves according to this ARP
standard are applicable to fluid power systems in all types
of flight vehicles, and it is applicable to Military, Civil and
Space design/certification standards
Port pattern per ISO Standard Readily available mounting manifolds
5Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
The 72 Series Flow Control Servo Valve consists of a
polarized electrical torque motor and two stages of
hydraulic power amplification. The motor armature
extends into the air gaps of the magnetic flux circuit and
is supported in this position by a flexure tube. The flexure
tube acts as a seal between the electromagnetic and
hydraulic sections of the valve. The 2 motor coils surround
the armature, one on each side of the flexure tube.
The flapper of the first stage hydraulic amplifier is rigidly
attached to the midpoint of the armature. The flapper
extends through the flexure tube and passes between 2
nozzles, creating two variable orifices between the nozzle
tips and the flapper. The pressure controlled by the flapper
and nozzle variable orifice is fed to the end areas of the
second stage spool.
The second stage is a conventional four-way spool design
in which output flow from the valve, at a fixed valve
pressure drop, is proportional to spool displacement from
the null position. A cantilevered feedback spring is fixed to
the flapper and engages a slot at the center of the spool.
Displacement of the spool defects the feedback sprint
which creates a force on the armature/flapper assembly.
Input signals induce a magnetic charge in the armature
and cause a deflection of the armature and flapper. This
assembly pivots about the flexure tube and increases the
size of one nozzle orifice and decreases the size of the
other.
The differential pressure created by this action causes
spool motion. The resulting spool displacement induces
a linear force in the feedback wire which opposes the
original input signal torque. Spool movement continues
until the feedback wire force equals the input signal force.
INTRODUCTION
DESCRIPTION OF OPERATION
Electro-hydraulic Servo Valve Cut-away
P
B
T
A
Spool
Inlet
Orifice
Coil
Bushing
Connector
Feedback Wire
Magnet (not shown)
Upper Polepiece
Flexure Tube
Armature
Lower Polepiece
Flapper
Nozzles
6Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
General Technical Data
TECHNICAL DATA
72 SERIES SERVO VALVES
Valve design 2-stage with spool and bushing and dry torque motor
Pilot valve Nozzle flapper standard dynamics
Mounting pattern ISO 10372-06-05-0-92
Installation position Any position, fixed or movable
Weight with steel body 7.26 kg (16.0 lb)
Weight with aluminium body 3.52 kg (7.8 lb)
Storage temperature range -40 to +60 °C (-40 to +140 °F)
Ambient temperature range -29 to +135 °C (-20 to +275 °F)
1)
Vibration resistance 30 g, 3 axis, 10 Hz to 2 kHz
Shock resistance 30 g, 3 axis
Maximum operating pressure
port P, X, A, B
• Aluminium body: 210 bar (3,000 psi)
• Steel body: 350 bar (5,000 psi)
• Filterless body: 490 bar (7,000 psi)
Maximum operating pressure port T
Static: same as P port. Normal operating: 70 bar (1,000 psi)
Minimum operating pressure 14 bar (200 psi)
Rated flow at Δp
N
35 bar
(500 psi)/spool land
95 l/min (25 gpm) 150 l/min (40 gpm) 225 l/min (60 gpm)
Maximum flow Q
max
355 l/min (93.8 gpm)
Typical leakage 3.50 l/min (0.92 gpm) 4.60 l/min (1.22 gpm) 5.20 l/min (1.39 gpm)
Maximum total leakage
(axis cut)
5.82 l/min (1.54 gpm) 7.62 l/min (2.01 gpm) 9.00 l/min (2.38 gpm)
Pilot flow 0.80 l/min (0.21 gpm)
Null adjust authority
2)
Greater than 10% of rated flow
Hydraulic fluid Hydraulic oil as per DIN 51524 parts 1 to 3 and ISO 11158
Seal material FKM (fluorocarbon) 90 Shore, EPR (ethylene-propylene copolymer) 90 Shore,
others upon request
Hydraulic fluid temperature range
-29 to +135 °C (-20 to +275 °F)
Recommended viscosity range
at 38 °C (100 °F)
10 to 85 mm
2
/s (cSt)
Recommended cleanliness class as
per ISO 4406 for functional safety
17/14/11
Recommended cleanliness class as
per ISO 4406 for longer service life
15/13/10
Recommended filter rating for
functional safety
ß10 ≤ 75 (10 μm absolute)
Recommended filter rating for
longer service life
ß5 ≤ 75 (5 μm absolute)
Hydraulic Data
1)
1) Measured at 210 bar (3,000 psi) pilot or operational pressure, oil viscosity 32 mm2/s and oil temperature +40 °C (+104 °F)
1) Option available for higher temperature ranges up to 400 °F.
7Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
TECHNICAL DATA
Typical Static and Dynamic Data
1)
72 SERIES SERVO VALVES
Step response time for 0 to 100 % stroke 95 l/min (20 gpm) = 11 ms
150 l/min (40 gpm) = 18 ms
225 l/min (60 gpm) = 33 ms
Threshold, typical ≤ 1.5 %
Hysteresis, typical ≤ 4.0 %
Null shift per ΔT = 38 °C (100 °F) ≤ 2.0 %
Rated flow tolerance ±10 %
8Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
STANDARD RESPONSE
The low flow pilot stage (F) ensures a uniform pressure
output. A high flow pilot stage (G) is available for improved
dynamics.
Type Type 2 description -3 dB point 90 deg phase lag Step response
S09..FOF S09 low response 48 Hz 80 Hz 11 ms
S09..FOG S09 high response 56 Hz 92 Hz 8.8 ms
S15..FOF S15 low response 41 Hz 84 Hz 18 ms
S15..FOG S15 high response 80 Hz 95 Hz 13.5 ms
Typical Characteristic Curves
Measured with 40 % signal amplitude, at 3,000 psi (210 bar) pilot or operating pressure, fluid viscosity of 24 cSt, and
fluid temperature of 104 °F (40 °C)
TECHNICAL DATA
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
S09FOG
S09FOF
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
S22FOF S22FOG
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
1 10 100 200 1 10 100 200
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
-18
20
40
60
80
100
120
140
160
180
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
S15FOF S15FOG
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
S09FOG
S09FOF
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
S22FOF S22FOG
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
1 10 100 200 1 10 100 200
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
-18
20
40
60
80
100
120
140
160
180
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
S15FOF S15FOG
9Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
STANDARD RESPONSE
The low flow pilot stage (F) ensures a uniform pressure
output. A high flow pilot stage (G) is available for improved
dynamics.
Type Type 2 description -3 dB point 90 deg phase lag Step response
S22..FOF S22 low response 32 Hz 75 Hz 33 ms
S22..FOG S22 high response 52 Hz 88 Hz 25 ms
TECHNICAL DATA
Typical Characteristic Curves
Measured with 40 % signal amplitude, at 3,000 psi (210 bar) pilot or operating pressure, fluid viscosity of 24 cSt, and
fluid temperature of 104 °F (40 °C)
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
S09FOG
S09FOF
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
-18
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
1 10 100 200
S22FOF S22FOG
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
1 10 100 200 1 10 100 200
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
-18
20
40
60
80
100
120
140
160
180
20
40
60
80
100
120
140
160
180
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
Magnitude (Decibels)
Frequency (Hz)
Phase Lag (Degrees)
S15FOF S15FOG
10Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
1. Typical wiring schematic
2. Location pin (refer to section Hole Pattern for position)
3. Filter
4. 4X Ø 10.31 mm (0.406 in) thru
5. Mechanical Null Adjust screw (requires 3/8” wrench and
3/32” hex key)
6. Optional Magnetic Null Adjust
7. 4-Pin connector mates with MS3106-14S-2S
6-Pin connector mates with MS3106-14S-6S
TECHNICAL DATA
INSTALLATION DRAWING
4
2
PIN D
PIN C
3
PIN B
5
PIN A
7
6
36.50
(1.437)
83
(3.27)
170
(6.70)
131
(5.17)
57
(2.24)
50
(1.97)
70
(2.75)
73.02
(2.875)
(1.845)
46.86
93.7
(3.69)
118
(4.65)
85.72
(3.375)
102
(4.02)
128
(5.04)
42.88
(1.688)
7.11 (.280)
35
(1.38)
98.8
(3.89)
Ø
6.35 (.250)
A B C D
Typical Wiring Schematic
70
(2.75)
1
Filtered Model
11Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
1. Typical wiring schematic
2. Location pin (refer to section Hole Pattern for position)
3. 4X Ø 10.31 mm (0.406 in) thru
4. Bushing pin is locked and cannot be adjusted
5. Optional Magnetic Null Adjust
6. 4-Pin connector mates with MS3106-14S-2S
6-Pin connector mates with MS3106-14S-6S
TECHNICAL DATA
INSTALLATION DRAWING
Filterless Model
Ø 6.35
(.250)
7.1
(.28)
2
3
5
118.0
(4.65)
69.85
(2.75)
38.10
(1.50)
34.92
(1.38)
Ø 60.5
(2.38)
BOTH ENDS
56.9
(2.24)
131.2
(5.17)
98.8
(3.89)
170.2
(6.70)
139.7
(5.50)
101.6
(4.00)
50.8
(2.00)
73.02
(2.875)
93.7
(3.69)
42.85
(1.687)
85.72
(3.375)
6
4
A B C D
Typical Wiring Schematic
1
42.85
(1.687)
12Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
TECHNICAL DATA
Surface
Surface to which valve is mounted requires:
• Flatness of 0.05 mm (0.002 in) over 100 mm (3.94 in)
• Average finish R
a
better than 0.8 μm (0.000032 in)
Ports
For maximum flow ports must be designed as follows:
• P, T, A, B with diameters of 18 mm (0.709 in),
15.88 mm (0.625 in) Ø counter-bored 18.94 mm
(0.746 in) inside Ø by 23.81 mm (0.937 in) outside Ø
Recommended Mounting Seals
• Material dependant on application
• 1.78 mm (0.070 in) cross section x 20.35 mm (0.801 in)
inside diameter, 90 durometer. Equivalent AS83248/2
size -019 for P, A, B, and T ports
• 1.78 mm (0.070 in) cross section x 9.25 mm (0.364 in)
inside diameter, 90 durometer. Equivalent AS83248/2
size -012 for X port
Recommended Mounting Screws
• Material dependant on application
• SHCS 3/8 x 2.0 long. Grade 8 minimum
• SHCS M10 x 50 long. Grade 10.9 minimum
MOUNTING REQUIREMENTS REF. ISO 10372-06-05-0-92
(PORT CIRCLE DIAMETER 2.0)
13Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
Rated Current and Coil Resistance
A variety of coils are available for 72 Series Servo Valves,
which offer a wide choice of rated currents.
TECHNICAL DATA
ELECTRICAL CONNECTION
Standard
ordering
code
1)
Command signal (mA) Coil resistance
[Ohms/coil at
25 °C (77 °F)]
2)
Power consumption [W] Coil inductance [H]
measured at 50 Hz
3)
Single
coil
Series
coil
Parallel
coil
Single
coil
Series
coil
Parallel
coil
Single
coil
Series
coil
Parallel
coil
4 ±8 ±4 ±8 1,000 0.064 0.032 3.2 9.7 2.6
H ±15 ±7.5 ±15 206 0.045 0.023 0.72 2.2 0.59
L ±40 ±20 ±40 80 0.128 0.064 0.22 0.66 0.18
1) Others optional
2) The resistance and inductance of standard coils are given below. The 2 coils in each Servo Valve are wound with equal turns giving
a normal production tolerance on coil resistance of ±10 %. Copper magnet wire is used, so the coil resistance will vary significantly
with temperature. The effects of coil resistance changes can be essentially eliminated through use of a current feedback servo
amplifier having high output impedance.
3) Inductance is determined under pressurized operating conditions and is greatly influenced by back electromagnetic forces of
the torque motor. These effects vary with most operating conditions, and vary greatly with signal frequencies above 100 Hz. The
apparent coil inductance values given are determined at 50 Hz.
A 4-pin electrical connector that mates with an
MS3106F14S-2S is standard. All 4 torque motor leads are
available at the connector so that external connections
can be made for series, parallel or single operation.
72 Series Servo Valves can be supplied on special order
with other connectors or pigtail.
Coil Connections
Standard Configuration for Valve Opening P ≥ B, A ≥ T
Single Series Parallel
A B C D
A B C D
A B C D
A (+), B (-) or C (+), D (-) A (+), D (-), B and C connected A and C (+), B and D (-)
14Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
The actual flow is dependent upon electrical command
signal and valve pressure drop. The flow for a given valve
pressure drop can be calculated using the square root
function for sharp edge orifices.
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
Flow Diagram for 4-way Operation
BACKGROUND
FLOW CALCULATION
Null-cut Options
Standard Axis Cut Underlap Spool Overlap Spool
Input Current
Control Flow
Q
I
Control Flow
Input Current
Q
I
Underlap
Zone
Input Current
Control Flow
Q
I
Overlap
Zone
Minimal change in gain through null
region. Best overall performance for
most closed loop systems.
Null region flow gain is higher than
normal. Always allows some small
amount of flow past the spool.
Null region flow gain is lower than
normal. Spool types can range from
minimal overlap to completely
blocked flow.
1
•
•
•
38 (10)
380 (100)
70
(1,000)
7
(100)
700
(10,000)
225 (60)
150 (40)
95 (25)
∆p [bar (psi)]
Q [l/min (gpm)]
15Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
ACCESSORIES AND SPARE PARTS
ORDERING INFORMATION
Part name Description Material Moog part number
Maintenance kit Base o-rings FKM per AMS7259
B52555RK099K001
Additional o-rings required for filter access Note that o-ring
material is dependant
on application
Filter tube
Field replaceable filter
16Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
DIN Rail Modules - Analog Control Cards
ORDERING INFORMATION
RELATED PRODUCTS
Moog’s DIN rail mounted module analog control cards
are ideal for use in enclosures where space is limited.
Modules include servo amplifiers, transducer conditioning
electronics, command and auxiliary function modules,
valve drive amplifiers and power supplies. All of these
modules are CE marked and require a 24 V
DC
supply. The
modules mount to standard 35 mm DIN rail mount for easy
installation and removal.
Portable Valve Testers - Evaluates Valves in the
Field
Valve testers are a cost effective method for evaluating
valves in the field. They provide a quick and easy means of
differentiating between hydraulic and electronic problems.
There are five models to choose from, each with different
levels of capability and flexibility to meet your specific
requirements. All valve testers have a compact, easily
portable design.
Mounting Manifolds - Easier Installation and
Maintenance
Various mountings manifolds are available for standard
industrial valves, including base and adapter types for
mounting and flushing requirements. Other hardware such
as bolts and connectors are also available.
The specific accessories you may need for a particular
model are listed in the relevant product catalogs and can
be ordered through your local office.
Filtration - Oil Filtration Requirements for
Industrial Servo Systems
The most effective way to reduce life cycle costs of
an oil hydraulic system is through close attention to
contamination control.
For industrial servo systems with 72 Series Servo Valves
the ideal system filter arrangement is summarized as
follows:
• Use a 10 micron (beta 10 ≥ 75) high pressure filter
without by-pass just before the valve or critical parts
of the valve (e.g. pilot).
• Use a 5 micron (beta 5 ≥ 75) low pressure filter in the
return or bypass line.
• Use a filter in the tank breather that is at least the
same filtration level as the finest filter in the system.
This recommendation is based on the fact that most servo
and proportional valves can accept the odd particle up to
25 microns so the pressure filter will protect the valve
from catastrophic failure. The real work is done by the
low pressure filter reducing small particle contamination
which is the prime contributor to component wear and
silting.
Assuming that the filters are properly dimensioned and
care is taken during initial installation and maintenance,
the aim should be to limit oil contamination to ISO 4406
17/14/11.
For long life, the maximum levels are 15/13/10,
respectively. It is important to note that these are
maximum contamination levels and with proper care
and regular filter change, significantly lower levels can
and should be achieved. Attention must also be paid to a
number of other factors that contribute to oil condition
problems such as elevated temperatures, high tank
humidity, “dirty” new oil.
17Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
ABOUT MOOG
Moog Inc. is a worldwide designer, manufacturer
and integrator of precision control components and
systems. Moog’s Industrial Systems Group designs and
manufactures high performance motion control solutions
combining electric, hydraulic, and hybrid technologies
with expert consultative support in a range of applications
including energy production and generation machinery,
industrial production machinery and simulation and test
equipment. We help performance-driven companies
design and develop their next-generation machines. Moog
Industrial Systems Group, with fiscal year 2020 sales of
USD 909 million and over 40 locations worldwide, is part
of Moog Inc. (NYSE: MOG.A and MOG.B) which has sales of
USD 2.885 billion.
This vast scope ensures that our engineers remain close
to the needs of machine builders and provide flexible
design solutions and technical expertise tailored to our
customers’ toughest challenges.
Moog experts work in close collaboration with machine
builders and application engineers to design motion
control systems for greater productivity, higher reliability,
superior connectivity, less costly maintenance and more
effective operations. Our regional presence, industry
knowledge and design flexibility ensure Moog motion
control solutions are tailored to their environment -
from meeting operating regulations and performance
standards, to taking machine performance to a higher
level.
Products
At the heart of every Moog solution is an array of products
engineered for precision, high performance and reliability.
For more than six decades, Moog products have been
specified for critical machine applications.
Some are developed specifically for unique operating
environments. Others are standard equipment on
machines across many industries. All are continuously
improved to take advantage of the latest technology
breakthroughs and advancements.
Moog products include:
• Servo Valves and Proportional Valves
• Servo Motors and Servo Drives
• Motion Controllers and Software
• Radial Piston Pumps
• Actuators
• Integrated Hydraulic Manifold Systems and Cartridge
Valves
• Slip Rings
• Motion Bases
ORDERING INFORMATION
18Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
ABOUT MOOG
Hydraulic Solutions
Since Bill Moog invented the first 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 world’s 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 require special expertise.
Hybrid Solutions
By incorporating the advantages of existing hydraulic
and electric technologies - including modular flexibility,
increased efficiency and cleanliness - into innovative
hybrid solutions, Moog offers new performance potential
in specialized applications.
Flight Simulation
Formula One Simulation Table
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/
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/industrial/service.
MOOG GLOBAL SUPPORT
ORDERING INFORMATION
19Rev. AB, April 2024
Moog 72 Series Flow Control Servo Valves
ORDERING CODE
S
09
15
150
O
D
10
4
G
H
J
L
M
N
Z
8
V
FKM 90 Shore
N
NBR 90 Shore (BUNA)
-072
-
-
7
4
6
M
5
9
A
12345678910 11
95
22
225
F
F
4
3
1
2
210
S
Model designation (assigned at factory)
Factory identification (revised level)
Valve version
Standard response
Rated flow in l/min (gpm)
Maximum operating pressure in bar (psi)
Bushing/spool design
(see Null Cut Options page 14 for designation)
4-way/±10 % overlap/linear
4-way/axis cut/linear
(3,000)
± 4 mA series (± 8 mA parallel)
± 5 mA series (± 10 mA parallel)
± 7.5 mA series (± 15 mA parallel)
Signals for 100 % spool stroke
Seal material
Connector over C1 (A) - side (RH)
Pressure in bar (psi)
17 to 210 (250 to 3,000)
Supply Return
Internal Internal
Pilot connections and pressure
Standard dynamics
Pilot stage design
Spool position without electrical signal
Center position
For = 70 bar (1,000 psi) per spool land p
Valve connector
Model number (assigned at the factory) Type designation
(40)
(25)
(60)
N
Optional feature
B
Connector over C2 (B) - side (LH)
X
Special
Series specification
Intrinsically safe
K
-
K
350
(5,000)
A
4-way/< = 3% overlap/linear
M
4-way/axis cut P
C
> 80% of P
P
/linear (servo drive)
All combinations may not be available.
1) Values with (490 bar/7,000 psi) maximum operating pressure uses a filterless body. Refer to installation specifics in this catalog.
5
17 to 210 (250 to 3,000) External Internal
Preferred Models
O
490
(7,000)
N
4-way/< 3% underlap/linear
G
High dynamics
6
17 to 490 (250 to 7,000) External External
F
FKM High pressure seals
± 10 mA series (± 20 mA parallel)
± 20 mA series (± 40 mA parallel)
± 25 mA series (± 50 mA parallel)
± 30 mA series (± 60 mA parallel)
± 100 mA series (± 200 mA parallel)
11
N
R
Optional Mechanical Null Adjust
Magnetic Null Adjustment
1)
aluminum
steel
steel
Reverse Polarity
E
EPR (ethylene-propylene copolymer)
B
3-way only, port A active, Port B vented to return
A
Port A open to return
B
Port B open to return
Model Number Type Designation Rated Flow (∆1,000 psi) Rated Current (single coil)
lpm gpm mA
-072-1101 S09FOFM4VBHN 25 ±15
-072-1102 S15FOFM4VBHN 40 ±15
-072-1203 S22FOFM4VBLN 60 ±40
-072-1201-6 S09KOFM4VBLN 25 ±40
-072-1202-6 S15KOFM4VBLN 40 ±40
-072-1203-6 S22KOFM4VBLN 60 ±40
Shaping the way our world moves™
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
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
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.
©2024 Moog Inc. All rights reserved. All changes are reserved.
72 Series Flow Control Servo Valves
TJW/PDF, Rev. AB, April 2024, CDL6266
