Moog Servo Proportional Valves
MOOG Servo Valves 72 Series
  • Description
  • Technique Feature
  • Specification
  • Applied Range

Moog ServoValves 72Series Catalog


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 provided by a cantilever spring. The valve design is simple and rugged for

dependable, long life operation.


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. 


General Technical Data

Valve design 2-stage, with spool and bushing and dry torque motor
Pilot stage Nozzle Flapper Standard Dynamics
Mounting pattern ISO 10372-06-05-0-92
Installation position Any orientation, fixed or movable
Weight 3.52 kg (7.75 lb)
Storage temperature range -40 to +60 °C (-40 to +140 °F)
Ambient temperature range -40 to +135 °C (-40 to +275 °F)
Vibration resistance 30 g, 3 axis, 10 Hz to 2 kHz
Shock resistance 30 g, 3 axis
Seal material Fluorocarbon (FKM) 85 SHORE
Others upon request


Hydraulic Data

Maximum operating pressure to ports P, T, A, B 210 bar (3,000 psi) - - - 350 bar (4,500 psi) special
Rated flow at pN 35 bar/spool land (500 psi/spool land) 95 l/min (25 gpm) 150 l/min (40 gpm) 225 l/min (60 gpm)
Null adjust authority Greater than 10% of rated flow
Hydraulic fluid Hydraulic oil per DIN 51524 parts 1 to 3 and ISO 11158.
Other fluids on request.
Temperature range -40 to +60 °C (-40 to +140 °F)
Recommended viscosity range 10 to 85 mm2/s (cSt)
Maximum permissible viscosity range 5 to 1,250 mm2/s (cSt)
Recommended filter rating  
For functional safety ß10 75 (10 µm absolute)
For longer life ß5 75 (5 µm absolute)


Static and Dynamic Data (at 3,000 psi)

Rated flow tolerance ± 10%
Step response time for 0 to 100% stroke 95 l/min (20 gpm) = 11ms
150 l/min (40 gpm) = 18 ms
225 l/min (60 gpm) = 33 ms
Threshold <1.5%
Hysteresis <4.0%
Null shift for ∆T = 38 °C (100 °F) <2.0%


72 Series - Direct-Operated Servo Valves for Analog Signals

- 2-stage design with dry torque motor:  Low friction double nozzle pilot stage

- High spool control forces

- High dynamics

- Rugged, long life design

- Optional 5th port for separate pilot supply

- Field-replaceable first stage disc filter for easier maintenance



Hydraulic Data

Rated Flow: 95 to 225 l/min (25 to 60 gpm) @ ∆p 70 bar (1000 psi)

Maximum Flow: 530 l/min (140 gpm)

Maximum Operating Pressure: 310 bar (4,500 psi)

Mounting Pattern: ISO 10372-06-05-0-92


Electric Data

Supply Voltage : N/A

Rated Signal Options: +/-4 mA, +/-7.5 mA and +/-20 mA

Additional Options: Contact Industrial Application Engineering for additional Flow, Pressure, and Signal options

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