Moog Servo Proportional Valves
MOOG Servo Valves D633 and D634
  • Description
  • Technique Feature
  • Specification
  • Applied Range
Moog Valves D633 D634 Catalog
 
 
D633 AND D634 SERIES SERVO CONTROL VALVES
 
The D633 and D634 Series are Direct Drive Valves (DDV) with electric closed loop spool position control. These valves are throttle valves for 3-, 4-, and 2x2-way applications. They are suitable for lectro hydraulic position, velocity, pressure or force control systems including those with high dynamic response requirements. The spool drive device is a ermanent magnet linear force motor which can actively stroke the spool from its spring centred position in both directions. This is an advantage compared with proportional solenoids with one force direction only. The closed loop spool position electronics and pulse width modulated (PWM) drive electronics are integrated into the valve. The integrated electronics of the valves is a new development featuring SMD technology with pulse width modulated (PWM) current output stage and requires a 24 VDC power supply.
- Directly driven by linear force motor: No pilot flow required
- Linear force motor with high force range (improves operating limits): No flow limitations
- Directly driven design: Pressure-independent dynamic performance
- Low current consumption at and near hydraulic null
- Spool is in spring-centered position at loss of power supply: Actuator stops

PERFORMANCE SPECIFICATIONS FOR STANDARD MODELS D633 AND D634

Model . . . Type   D633
Mounting pattern with or without leakage port Y 3)   ISO 4401-03-03-0-94
Port diameter mm (in) 7.9 (0.31)
Valve version 2)   Single stage, spool in bushing
3-way, 4-way, 2x2-way
Spool actuation   directly, with permanent magnet
linear force motor
Pilot supply   none
Mass kg (Ib) 2.5 (5.5)
Rated flow (±10%) at ΔpN= 35 bar per land l/min (gpm) 5 / 10 / 20 / 40 (1.3 / 2.6 / 5.3 / 10.6)
Max. valve flow l/min (gpm) 75 (19.8)
Operating pressure max.    
Ports P,A,B bar (psi) 350 (5000)
Port T ohne Y bar (psi) 50 (715)
Port T mit Y bar (psi) 350 (5000)
Port Y bar (psi) directly to tank
Response time for 0 to 100% stroke, typical ms ≤ 12
Threshold 1) % < 0.1
Hysteresis 1) % < 0.2
Null shift 1) with ΔT = 55 K % < 1.5
Null leakage flow 1) max. (axis cut) l/min (gpm) 0.15 / 0.3 / 0.6 / 1.2 (0.04 / 0.08 / 0.16 / 0.32)
1) At operating pressure pp = 140 bar (2000psi), fluid viscosity of 32 mm2/s (0.05 in2/s) and fluid temperature of 40 °C (104° F)
2) See symbols page 4
3) Leakage port Y must be used
    with 3- and 4-way function and pT > 50 bar (715psi)
    with 2x2-way function
 
 
Model . . . Type   D634
Mounting pattern with or without leakage port Y 3)   ISO 4401-03-03-0-94
Port diameter mm (in) 11.5 (0.45)
Valve version 2)   Single stage, spool in bushing
3-way, 4-way, 2x2-way
Spool actuation   directly, with permanent magnet
linear force motor
Pilot supply   none
Mass kg (Ib) 6.3 (13.9)
Rated flow (±10%) at ΔpN= 35 bar per land l/min (gpm) 60 / 100 (15.8 / 26.3)
Max. valve flow l/min (gpm) 185 (48.8)
Operating pressure max.    
Ports P,A,B bar (psi) 350 (5000)
Port T ohne Y bar (psi) 50 (715)
Port T mit Y bar (psi) 350 (5000)
Port Y bar (psi) directly to tank
Response time for 0 to 100% stroke, typical ms ≤ 20
Threshold 1) % < 0.1
Hysteresis 1) % < 0.2
Null shift 1) with ΔT = 55 K % < 1.5
Null leakage flow 1) max. (axis cut) l/min (gpm) 1.2 / 2.0 (0.26 / 0.43)
1) At operating pressure pp = 140 bar (2000 psi), fluid viscosity of 32 mm2/s (0.05 in2/s) and fluid temperature of 40 °C (104° F)
2) See symbols page 4
3) Leakage port Y must be used
    with 3- and 4-way function and pT > 50 bar (715 psi)
    with 2x2-way function
 

Directly driven by linear force motor: No pilot flow required

Linear force motor with high force range (improves operating limits): No flow limitations

Directly driven design: Pressure-independent dynamic performance

Low current consumption at and near hydraulic null

Spool is in spring-centered position at loss of power supply: Actuator stops

 

Specifications

Hydraulic Data

Rated Flow: 5 to 100 l/min (1.3 to 26.3 gpm) @ ∆p 35 bar (500 psi) per land

Maximum Flow: 180 l/min (47 gpm) size 05

Maximum Operating Pressure: 350 bar (5,000 psi)

Mounting Pattern: ISO 4401 Size 03 and 05 (NG 6 and 10)

100% Step Response: 12 ms @ 210 bar (3,000 psi)

 

Electrical Data

Supply Voltage :24 VDC (18 to 32 VDC)

Rated Signal Options: +/-10 V, +/-10 mA and 4-20 mA

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