MOOG D634-501A

MOOG D634-501A servo proportional valve unit
MOOG D634-501A - Image 2
MOOG D634-501A - Image 3
MOOG D634-501A - Image 4

Description:

The D634‑501A is part of the D634 family of directly‑operated (direct‑drive) analog servo valves manufactured by MOOG. These valves are designed for hydraulic systems requiring precise control of flow and direction under high pressure. The spool is driven by a linear‑force motor (permanent magnet), eliminating the need for a pilot flow and providing a pressure‑independent dynamic performance. The spool is spring‑centered and will return to neutral (stop actuator) if power supply is lost — a safety/fail‑safe feature.

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Product Details of MOOG D634-501A

Parameter Value / Description
Valve type / size Direct‑drive analog servo valve — D634 Series, Size 05 (ISO 4401-05)
Spool actuation Linear force motor (permanent magnet), single‑stage, spool in bushing
Control function Flow / Directional Control (3‑way, 4‑way, 2×2‑way)
Rated flow (Δp = 35 bar per land) 100 l/min (≈ 26.4 gpm)
Maximum flow Up to 180 l/min (≈ 47.6 gpm)
Maximum operating pressure (Ports P, A, B) 350 bar (5,000 psi)
Port T pressure (without leakage port Y) 50 bar (725 psi)
Port T pressure (with leakage port Y) 210 bar (3,000 psi) – depending on configuration.
Leakage flow (null, axis cut) ~1.2 l/min (0.32 gpm) — typical value.
Response time (0 → 100% stroke) ~20 ms (typical)
Environmental / Mechanical limits Ambient temperature: –20 °C to +60 °C Storage temp range: –40 °C to +80 °C Vibration: 30 g (3‑axis); Shock: 50 g (6 directions)