MOOG D765-102-4

Description

Technical Specifications:

• Product Model: D765-102-4

• Manufacturer: MOOG Inc.

• Product Category: Two-Stage Flow Control Servo Valve

• Rated Flow: 19 L/min (at 70 bar pressure drop)

• Working Pressure: P, X, A, B ports maximum 315 bar

• Valve Type: Two-stage, nozzle-flapper with position feedback torque motor

• Response Time (typical): Approximately 4 ms

• Hysteresis: <0.1%

• Ambient Temperature Range: -20°C to +60°C

• Fluid Temperature Range: -20°C to +80°C

• Operating Fluid: Mineral oil-based hydraulic fluid (DIN 51524 Parts 1-3)

• Recommended Cleanliness: ISO 4406 <14/11

• Protection Rating: IP65 (when connector installed)

• Mounting Standard: ISO 10372-04 standard interface

• Control Signal: ±10 mA analog drive

• Null Bias Current: ≤ ±0.5 mA

• Symmetry: Positive/negative flow deviation ≤2%

• Internal Leakage: ≤0.5 GPM @ 3000 psi

Functional Features:

• Two-stage four-way electro-hydraulic servo valve for high-response, high-precision hydraulic flow and direction control

• Electrical feedback closed-loop control with integrated electronic controller

• Built-in position sensor for real-time spool position monitoring

• Ultra-low hysteresis (<0.1%) for exceptional control precision

• Fast dynamic response with 4 ms typical response time

• Excellent disturbance rejection

• Robust contamination resistance with extended service life design

Performance Parameters:

• Rated Flow: 19 L/min at 70 bar

• Maximum Pressure: 315 bar

• Response Time: 4 ms (typical)

• Hysteresis: <0.1%

• Null Bias: ≤ ±0.5 mA

• Symmetry: ≤2% deviation

• Internal Leakage: ≤0.5 GPM @ 3000 psi

Material Composition:
Industrial-grade hydraulic valve construction with high-wear-resistance internal components. Robust valve body with durable construction for harsh industrial conditions.

Structural Features:
The D765-102-4 features a two-stage nozzle-flapper configuration with position feedback torque motor. Unlike traditional mechanical feedback servo valves, the D765-102-4 employs electrical feedback with an integrated electronic controller. A built-in position sensor continuously monitors main spool position.

Working Principle:
A control signal (±10 mA) is applied to the torque motor, which positions the pilot stage flapper between two nozzles. The resulting differential pressure shifts the main spool, directing hydraulic flow to the actuator. A built-in position sensor monitors the main spool position and provides feedback to the integrated electronic controller, creating a closed-loop control system. The feedback signal is compared with the command signal to achieve ultra-precise spool positioning with hysteresis below 0.1%.

Advantages and Strengths:

• Electrical feedback provides superior precision and repeatability compared to mechanical feedback designs

• Ultra-low hysteresis (<0.1%) enables unprecedented control accuracy

• Fast response time (4 ms) for demanding dynamic applications

• Excellent contamination resistance with extended service life

• Direct replacement for early Moog J761 and some D633/D661 models

• Outstanding disturbance rejection for stable control under varying loads

Applicable Industries:

• Aerospace (aircraft wing component hydroforming)

• Flight simulators (six-degree-of-freedom motion systems, FAA Level D/EASA FNPT III certified)

• Material testing machines (fatigue testing, structural loading)

• Industrial automation closed-loop systems

• Injection molding (fill and pack phase control)

• High-speed presses and test rigs

• Legacy test equipment replacement

Model Series:
MOOG D765 Series Flow Control Servo Valves

Installation Requirements:

• ISO 10372-04 standard interface mounting

• Requires ±10 mA output servo amplifier (Moog M146-002, Rexroth VT-MSPA, or compatible)

• Amplifier bandwidth must be ≥250 Hz

• Hydraulic oil cleanliness must meet NAS 1638 Class 6 or ISO 4406 16/13/10

• High-pressure filter with β₁₀ ≥ 75 required upstream of valve

• Return line back pressure must not exceed specified limits

Usage Precautions:

• Oil cleanliness must meet ISO 4406 <14/11 standard

• Fluid temperature range: -20°C to +80°C

• Ambient temperature range: -20°C to +60°C

• Connector must be properly installed for IP65 protection

• Only mineral oil-based hydraulic fluids conforming to DIN 51524 permitted

• Contamination is the primary cause of valve degradation

• Verify flow and electrical interface compatibility before installation