Spool hydraulic directional control valve D633
electrically-operateddirect-operatedproportional

Spool hydraulic directional control valve - D633 - Moog GmbH - Niederlassung Memmingen - electrically-operated / direct-operated / proportional

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Characteristics

Type

spool

Actuating method

electrically-operated, direct-operated

Other characteristics

proportional

Operating pressure

Min.: 50 bar
(725.19 psi)

Max.: 350 bar
(5,076.32 psi)

Flow rate

Min.: 0.7 l/s
(0.2 us gal/s)

Max.: 3 l/s
(0.8 us gal/s)

Description

Product description
Moog valves of series D633 and D634 are direct-operated servovalves with integrated electronics and analog interfaces. The servovalves use a direct drive with a permanent-magnet linear motor that moves the valve spool directly, eliminating the need for pilot oil. They are available in nominal sizes 03 (D633) and 05 (D634) according to ISO 4401. Designed for demanding industrial applications, the valves offer functional flexibility, pressure-independent dynamics, high control force and low current consumption.

Features

Direct drive by permanent-magnet linear motor: no pilot/control oil required
Linear-force motor with wide force range (extends operational limits): no flow restriction
Direct-driven design: pressure‑independent dynamic performance
Low current consumption at and near hydraulic null
Spool is spring-centered on power loss: actuator remains at rest

Specifications (tabular data)
Columns: D633 | D634
Function: Flow | Flow
Mounting pattern: ISO 4401 size 03 (NG6) | ISO 4401 size 05 (NG10)
Hydraulic data:
Rated flow at ∆pN 35 bar per control edge: up to 40 l/min | up to 100 l/min
Max. flow: 75 l/min | 180 l/min
Max. operating pressure: Port P, A, B = 350 bar; Port T without Y = 50 bar; Port T with Y = 350 bar
Step response 0–100%: 12 ms | 20 ms
Electrical data:
Supply voltage: 24 V DC (18–32 V DC)
Rated signal options: +/-10 V, +/-10 mA and 4–20 mA
Electrical interface: 6 + PE

Characteristics / Technical specifications

Direct drive with permanent-magnet linear motor
Available nominal sizes: ISO 4401 size 03 (NG6) for D633 and size 05 (NG10) for D634
Rated flow (∆pN 35 bar): D633 up to 40 l/min, D634 up to 100 l/min
Max. flow: D633 75 l/min, D634 180 l/min
Max. operating pressure: Port P, A, B = 350 bar; Port T without Y = 50 bar; Port T with Y = 350 bar
Step response 0–100%: D633 = 12 ms, D634 = 20 ms
Supply voltage: 24 V DC (range 18–32 V DC)
Rated signal options: +/-10 V, +/-10 mA, 4–20 mA
Electrical interface: 6 + PE