4WRE Series Proportional Directional Valve
Product Overview
4WRE Series Proportional Directional Valve is a direct‑operated, high‑precision electro‑hydraulic Hydraulic valve with electrical spool‑position closed‑loop feedback, widely used for accurate flow and direction regulation in medium‑high‑performance hydraulic system and automated industrial Machine[(Bosch Rexr...)].
This compact proportional Hydraulic valve has two variants: 4WRE with external drive amplifier and 4WREE equipped with built‑in onboard electronics (OBE). Driven directly by proportional solenoids without pilot‑oil supply, it converts analog electric signals into stepless hydraulic output. The built‑in displacement sensor forms closed‑loop control, delivering excellent repeatability, low hysteresis and smooth shock‑free speed adjustment for hydraulic cylinders and hydraulic motors. It greatly improves motion stability and control accuracy of the whole hydraulic system, serving as an ideal precision control component for CNC machine tools, hydraulic test benches, injection‑molding auxiliary equipment and automation‑driven Machine[(Bosch Rexr...)].
Technical Specifications
‑ Model Series: 4WRE‑2X, 4WREE‑2X
‑ Product Type: Direct‑operated electro‑hydraulic proportional directional Hydraulic valve, closed‑loop spool‑position feedback
‑ Nominal Sizes: NG6, NG10
‑ Max working pressure (P/A/B ports): 315‑350 bar
‑ Return port T max pressure: 210 bar
‑ Rated flow range: 8‑75 L/min (Δp=10 bar)
‑ Mounting: Sub‑plate mounting, ISO 4401‑03 / 05 standard installation dimension
‑ Spool function: 4/2‑way, 4/3‑way, spring‑centered
‑ Solenoid: Detachable wet‑pin DC proportional solenoid
‑ Control Mode: 4WRE: External amplifier control; 4WREE: Integrated onboard electronics (24 VDC power supply, ±10 V / 4‑20 mA signal)
‑ Working medium: Anti‑wear hydraulic mineral oil for industrial hydraulic system
‑ Oil temperature range: ‑20℃ ~ +80℃
‑ Key Features: Compact structure, fast dynamic response, high‑repeat‑accuracy closed‑loop regulation, simple circuit layout, stable long‑time operation for precision hydraulic Machine
Working Principle
As a direct‑drive proportional Hydraulic valve, 4WRE series requires no pilot oil source. After receiving the electric command signal, the proportional solenoid pushes the main spool to produce linear displacement. The integrated inductive spool‑position sensor feeds real‑time spool‑position data back to the control amplifier, forming a full closed‑loop regulation. By changing the opening area of valve ports, the valve steplessly adjusts oil‑flow rate and flow direction inside the hydraulic system, thus precisely controlling movement speed and direction of hydraulic actuators.
Failure of position sensor, damaged proportional solenoid or breakdown of electronic module will cause unstable speed, position drift, vibration or slow response of the Machine. Replacing a qualified 4WRE proportional directional valve can restore high‑precision closed‑loop control performance of your hydraulic circuit.
Core Advantages
1. Spool‑position closed‑loop feedback realizes outstanding control repeatability and stability, significantly improving regulation precision of the hydraulic system.
2. Direct‑operated structure eliminates pilot‑oil requirements, simplifying hydraulic circuit design for compact‑space Machine.
3. Two optional electric‑control configurations: external amplifier or built‑in onboard electronics, flexible for different control‑cabinet layouts.
4. Standard ISO sub‑plate installation, strong interchangeability, convenient for upgrading or replacing existing hydraulic system.
5. Low‑hysteresis, high‑precision spool‑sleeve pair ensures smooth acceleration‑deceleration and shock‑free direction switching during equipment operation.
Application Range
4WRE Series proportional directional Hydraulic valve is a core closed‑loop control component for medium‑precision industrial hydraulic system. It is widely applied to CNC machine‑tools, hydraulic test‑benches, packaging machinery, automated production‑lines, small‑and‑medium‑sized hydraulic presses, injection‑molding auxiliary equipment and other hydraulic‑driven automated Machine. Suitable for hydraulic‑system integrators, automation‑equipment‑manufacturers, maintenance workshops and global spare‑parts distributors.
