I. Core Parameters (Official Standard Version)

1) Basic Specifications

Model: D633‑434B (Direct Acting Servo Valve DDV)

Installation Specifications: NG6 / ISO 4401‑03

Rated Flow: 40 L/min @ Δp=35 bar

Working Pressure:

P/A/B: 350 bar

T Port: ≤50 bar (No Y Port, Low Pressure Return Oil) Moog Inc.

Frequency Response: 250–300 Hz (Ultra-High Response / Top Dynamic Level)

Step Response: ≤8 ms (0→100%) Moog Inc.

Sealing: FKM Fluororubber (−20～+120℃, High Temperature Resistance)

Hysteresis: <0.2% Moog China

Resolution: <0.1% Moog China

Power Supply: 24VDC (18–32V) Moog Inc.

Control Signal: ±10V / 4–20mA Moog Inc.

Feedback: Built-in LVDT Valve Core Position Closed-loop Moog China

Neutral Function: O Type (Three-Position Four-Port Fully Closed)

Weight: Approximately 3.2 kg

Electrical Interface: 6+PE Aviation Plug Moog Inc.

2) Performance Features

Drive Method: Permanent Magnet Linear Force Motor, Direct Drive Valve Core, No Pilot Stage Moog China

Dynamic Characteristics: Extremely High Frequency Response, Extremely Fast Response, Not Affected by System Pressure, Top Speed Closed-loop

Leakage: Low Internal Leakage, Low Power Consumption, Low Heat Generation Moog China

Anti-Contamination: No Fine Orifice, Strong Anti-Contamination Capacity, High Reliability Moog China

Power Failure Safety: Spring Centering When Power Failure, Load Stopped, Safe Failure

High Temperature Tolerance: FKM Sealing, Can Work Long-Term in 100–120℃ Environment

Ultra-High Dynamic: Suitable for Ultra-High Speed Position / Speed / Pressure High-Precision Closed-loop Control

II. Typical Application Scenarios

40L/min Medium Flow + Ultra-High Response (250–300Hz)

T Port Low Pressure Return Oil (≤50bar), No Need for Y Port

High Temperature Conditions (Environmental / Oil Temperature Maximum 120℃), High Temperature Hydraulic Oil

Ultra-High Speed Precision Press Machine, High Frequency Dynamic Test Bench, High-Speed Robot, Medium Flow, Ultra-High Dynamic, Low Pressure Return Oil, High Temperature-Tolerant Top High-Precision Closed-loop System