MOOG D638

Description:

The Moog D638 is a direct-drive digital control servo valve used for precise hydraulic control of pressure (p), flow (Q), or combined pressure/flow (p/Q). Moog+2Moog+2
It uses a permanent-magnet linear force motor to directly shift the valve spool — eliminating the need for pilot oil and enabling fast, high-performance response. Moog+2Scribd+2
With built-in electronics and an integrated pressure transducer (and optionally fieldbus interfaces such as CANopen, EtherCAT, or PROFIBUS-DP), the D638 offers high flexibility and control precision for demanding industrial applications.

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MOOG D638 Hydraulic Valve – Precision in Every Pulse

Parameter	Specification
Mounting Pattern	ISO 4401 Size 03 (NG6)
Valve Design	1-stage, spool & bushing
Weight	2.5 kg (5.5 lb)
Hydraulic: Rated Flow	5 / 10 / 20 / 40 l/min per spool land @ Δp = 35 bar (500 psi)
Hydraulic: Max Flow	75 l/min (19.8 gpm)
Hydraulic: Max Operating Pressure (P, A, B ports)	350 bar (5,000 psi)
Hydraulic: Port T (no Y)	50 bar (725 psi)
Hydraulic: Port T (with Y)	350 bar (5,000 psi)
Response: Step (0→100%)	~ 8 ms
Electrical Supply	24 V DC (range 18–32 V DC)
Control Signal Options	±10 V, ±10 mA, 4–20 mA ; optional fieldbus (CANopen, EtherCAT, PROFIBUS)
Ambient Temperature Range	–20 to +60 °C
Storage Temperature Range	–40 to +80 °C
Shock / Vibration Resistance	30 g (vibration), 50 g (shock)