MOOG D0156H524410001

Technical Specifications

• Valve type: Two-stage electro-hydraulic servo valve with mechanical feedback
• Nominal flow rate: 45 lpm (12 gpm) at 70 bar pressure drop
• Maximum operating pressure: 350 bar (5000 psi)
• Electrical input: 4–20 mA or ±10 V DC
• Power supply: 24 V DC
• Electrical connection: 9-pin D-sub connector

Functional Features

• Low hysteresis and high repeatability for precise control
• Double-nozzle flapper pilot stage for high dynamic response
• Robust construction withstands high shock and vibration environments
• Integrated filtration protects internal components from contamination
• Optional fail-safe position on loss of electrical signal

Application Scenarios

• Hydraulic press and metal forming machinery
• Injection molding machine clamping control
• Material testing systems
• Steel and aluminum rolling mills
• Aerospace and defense test equipment

Performance Parameters

• Linearity: ±0.5% of full scale
• Hysteresis: ±0.5% of full scale
• Repeatability: ±0.2% of full scale
• Step response time: 5 ms (10–90% stroke)
• Frequency response: 90 Hz at -3 dB amplitude

Material Composition

• Valve body: Stainless steel
• Spool and sleeve: Hardened tool steel with lapped finish
• Torque motor: High-flux magnetic steel with corrosion-resistant coating
• Seals: Fluoroelastomer compatible with mineral-based hydraulic fluids

Structural Features

• Compact cartridge-style design for manifold mounting
• Standard mounting pattern conforming to ISO 10372
• Integrated electrical connector with strain relief
• Adjustable mechanical stroke stops

Working Principle An electrical input signal is applied to the torque motor, which creates a magnetic force that rotates the flapper. This changes the pressure balance between the two nozzles, creating a pressure differential across the main spool. The spool shifts to meter hydraulic flow to the actuator. A mechanical feedback spring returns the flapper toward neutral as the spool moves, creating a closed-loop proportional relationship between input signal and valve flow.

Installation Requirements

• Install on a flat, rigid manifold surface with proper torque on mounting bolts
• Ensure hydraulic fluid cleanliness meets ISO 4406 class 18/15 or better
• Ambient operating temperature: -30°C to +80°C
• Mount the valve with the electrical connector facing downward to prevent fluid ingress
• Apply appropriate torque to hydraulic fittings to avoid leaks

Operation Notes

• Do not exceed maximum operating pressure or temperature ratings
• Maintain proper hydraulic fluid filtration to prevent valve contamination
• Relieve system pressure before disconnecting hydraulic lines
• Calibrate valve zero and gain after installation
• Periodically inspect for external leaks and abnormal noise