1. Product Overview

2. Main Technical Parameters

3. Product Features

3.1 Technological Innovation

• Permanent Magnet Linear Force Motor Direct Drive: Enables bidirectional drive of spool movement without the need for centering springs, ensuring flexible and sensitive control action.
• Built-in Electronic Amplifier: Adopts SMD surface mount technology and 24V DC power supply, with integrated PWM circuit and high-precision position feedback module for stable signal transmission.
• Direct Drive Valve (DDV) Design: Eliminates pilot stage leakage loss, and its dynamic response performance is independent of oil supply pressure, achieving more stable and reliable hydraulic control.

3.2 Structural Advantages

• Dual Nozzle-Flapper Pilot Stage Structure: Equipped with a self-flushing filter, which is detachable and cleanable, effectively reducing impurity blockage and improving equipment durability.
• Symmetrical Four-Way Spool Valve: Adopts zero-overlap design with neutral position leakage less than 1.5 L/min, realizing high-precision flow and pressure control.
• Tungsten Carbide Coating on Spool Surface: Processed by laser cladding technology, which triples the service life of the valve core and enhances wear and corrosion resistance.
• Multiple Feedback Modes: Standard equipped with mechanical force feedback system, and optional digital LVDT feedback with a resolution of 0.1 μm to meet high-precision control requirements.

3.3 Performance Characteristics

• High dynamic response and high pressure gain, realizing fast and accurate hydraulic adjustment
• Excellent pollution resistance, low hysteresis and low threshold value, adapting to complex working conditions
• Low power consumption with real-time monitoring signal function, convenient for equipment state detection
• Optional fail-safe version to ensure system safety under abnormal working conditions

4. Structure and Composition

• Linear Force Motor (Drive Stage): Converts electrical control signals into mechanical driving force to drive the spool movement stably.
• Nozzle-Flapper Pilot Valve: Adopts dual nozzle-flapper structure to realize primary amplification of control signals and improve control sensitivity.
• Main Spool Valve: Symmetrical four-way spool valve design with high-strength tungsten carbide coating for long-term stable operation.
• Displacement Feedback Sensor: Supports standard mechanical force feedback and optional high-precision LVDT sensor feedback.
• Integrated Electronic Amplifier: Built-in PWM drive circuit and signal processing unit to complete closed-loop signal control.
• Hydraulic Interface: Adopts SAE J518 Code 61 (NG06 flange) standard interface for universal and convenient installation.
• Detachable Self-Flushing Filter: Effectively controls pilot stage leakage, with the leakage volume lower than 0.5 L/min under 210 bar working pressure.

5. Application Fields

• Aerospace: Flight control systems, hydraulic actuation systems, and precision aircraft hydraulic regulation equipment
• Automotive Industry: Engine test benches, chassis performance test equipment, and automotive hydraulic calibration systems
• Energy and Power: Gas turbine control systems, water turbine speed regulation systems, and power equipment hydraulic control units
• Metallurgical Industry: Rolling mill hydraulic systems, continuous casting equipment control, and metal processing hydraulic precision regulation
• Chemical Industry: High-precision pressure and flow closed-loop control systems for chemical production processes
• Testing and Verification: Performance testing and calibration of various hydraulic components and complete hydraulic systems
• Other Fields: All electro-hydraulic position, speed, pressure and force control systems requiring high dynamic response and high precision

6. Installation Requirements and Precautions

6.1 Installation Environment Requirements

• Install the valve in a clean and low-dust working environment to avoid particle pollution affecting valve performance.
• Keep away from corrosive gas and liquid to prevent structural corrosion and component damage.
• Ensure the ambient temperature is within the specified working range to guarantee stable electrical and hydraulic performance.
• Avoid installation near strong magnetic field equipment to prevent magnetic interference from affecting signal feedback accuracy.

6.2 Pre-installation Preparation

• Hydraulic System Cleaning: Thoroughly clean the entire oil circuit before installation to remove residual impurities, oil sludge and welding slag.
• Filter Installation: A filter with filtration accuracy below 5 μm must be installed in the system to protect the servo valve core.
• Zero Adjustment Device: Do not arbitrarily toggle the zero adjustment device before installation to avoid deviation of initial parameters.
• Flushing Plate: Remove and properly store the flushing plate before installation for subsequent equipment maintenance and overhaul.
• Sealing Ring Inspection: Check the integrity of the sealing rings at all oil ports on the mounting surface to prevent oil leakage after installation.

6.3 Pipeline Connection

• Connection Mode: It is recommended to adopt ferrule-type 24° cone structure connectors; welding connection is strictly prohibited to avoid pipeline deformation and impurity falling off.
• Mounting Surface Requirements: The mounting surface shall be smooth, flat and clean without scratches, burrs and dirt.
• Installation Direction: The valve supports omnidirectional installation, and vertical installation is recommended for optimal operating performance.
• Oil Drainage Mode: The drainage oil pipeline shall be directly connected back to the oil tank to ensure smooth oil drainage.

6.4 Electrical Connection

• Confirm the electrical polarity and supply voltage are correct before power-on operation.
• Incorrect electrical connection will cause permanent damage to the servo valve.
• The instantaneous maximum current of the coil shall not exceed twice the rated current to avoid burning out electrical components.

6.5 Oil Tank Requirements

• The oil tank shall be a sealed structure, and stainless steel plate is preferred as the manufacturing material to prevent rust and pollution.
• Equip the oil tank with a dedicated oil filling and air filter to ensure the cleanliness of internal hydraulic oil.
• Systems with long-term continuous operation shall be equipped with high-capacity fine filters to maintain oil quality stability.

6.6 Other Precautions

• It is forbidden to use linen thread, adhesive and sealing tape as sealing auxiliary materials to avoid polluting the hydraulic system.
• A dither signal shall be applied during the operation of the moving coil servo valve to improve control accuracy.
• The filtration cleanliness grade of the oil tank and the entire hydraulic system must meet the standard requirements.