Moog Servo Proportional Valves
MOOG Servo Valves D633 and D634
  • Description
  • Technique Feature
  • Specification
  • Applied Range
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Moog Valves D633 D634 Catalog
 
 

MOOG D633 and D634 Series Servo Control Valves Dscription

The MOOG servo valve D633 and the D634 series are direct actuated valves (DDV) controlled by the closed loop control of the charged feedback valve core position. These valves are throttle valves for 3-, 4-, and 2x2-way applications. They are suitable for electro hydraulic position, velocity, pressure or force control systems including those with high dynamic response requirements. The spool drive device is a permanent 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. The advantages of the direct servo valve (DDV) Moog D633, D634:

- It is driven directly by a permanent magnet linear force motor with high drive power

- No need to lead the source of oil

- Dynamic performance is not affected by pressure

- Low hysteresis and high resolution

- Low power consumption of hydraulic zero position and close to hydraulic zero position

- Standardized valve core position detection signal, through this signal to get the system operation, and the maintenance of the valve is very favorable.

- Electric zero adjustment

- When the power is broken or the cable is broken or emergency stop, the valve core will return to its spring position automatically without the external force.

 

The working principle of the direct servo valve MOOG D633 and D634:

The closed loop control of the valve core displacement with a position sensor and a linear force motor is realized by an integrated circuit board. The electrical signals corresponding to the required spool displacement are input into the integrated circuit board, which will be converted into a pulse width modulation (PWM) current to drive a linear force motor. The oscillator drives the valve core position sensor (LVDT) to produce an electrical signal that is proportional to the displacement of the valve core.

 

MOOG Servo Valves D633 and D634 Series, which are DDV with electric closed loop spool position control. Most of them are used on hydraulic systems on Cement plants, Steel mills, Power plants, Testing machines, Metallurgical equipment etc. the type code as: D633-303B, D633-308B, D633-313B, D634-460B, D634-317B, D634-531B, D633Z570B, D633Z395C, D633Z549A, D634-319C, D634-1003, D634-1019, D634-341C, D634-317C, D634-501A, D634-514A, D634-543A, D634-327C, D634Z1044, D633K, D634K-P, D635K ....welcome inquiry us if you have any demand for these MOOG servo valve. Heash, provide the orginal MOOG servo valves to you in time!

 

MOOG Valve D633 and D634 Technical Data

Model . . . Type   MOOG 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   MOOG 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

 

MOOG Direct-Operated Servo Valves D633 and D634 Series Feature

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

 

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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