MOOG D634 Hydraulic Valve

ISO 4401 NG10 mount hydraulic valve MOOG D634
MOOG D634 Hydraulic Valve - Image 2
MOOG D634 Hydraulic Valve - Image 3
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MOOG D634 Hydraulic Valve - Image 5

Description:

The MOOG D634 is a direct-driven hydraulic servo (proportional) valve from the D633/D634 series, designed for precise fluid flow control in industrial hydraulic systems. It uses a permanent-magnet linear force motor to directly actuate the spool — eliminating the need for pilot oil — which results in high dynamic performance, pressure-independent behavior, and low power consumption. Typical applications include hydraulic presses, injection-molding machines, die casting presses, test benches, and other industrial machinery requiring accurate, stable flow and pressure control.

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Product Details of MOOG D634 Hydraulic Valve

Parameter / Feature Specification / Value
Valve Design Single-stage, spool in bushing (1-stage)
Mounting Pattern ISO 4401-05-05-0-05 (NG10 / Size 05), with or without leakage-oil connection Y
Spool Actuation Direct drive — permanent-magnet linear force motor (no pilot oil)
Control Function Flow control (servo-proportional)
Rated Flow (per land) @ Δp = 35 bar Up to 100 L/min (26.4 gpm) for D634 (standard)
Maximum Flow Up to 180 L/min (47 gpm) for size 05 version
Maximum Operating Pressure (Ports P, A, B) 350 bar (5000 psi)
Pressure Port T (without leakage-oil port Y) 50 bar (725 psi)
Pressure Port T (with leakage-oil port Y) Up to 210 bar (3000 psi)
Leakage Flow (null-lap) ~1.2 L/min (0.32 gpm) — or ~2.0 L/min (0.53 gpm) depending on configuration
Response Time (0 → 100% step) Typically ≤ 20 ms (for D634)
Supply Voltage / Command Signal 24 V DC (18–32 V DC); input options: ±10 V, ±10 mA, or 4–20 mA.
Environmental / Mechanical Conditions Ambient temperature: –20 °C to +60 °C; storage: –40 °C to +80 °C; vibration resistance: 30 g (3-axis); shock: 50 g (6 directions)