4WRA(E)-2X Proportional Directional Valve
Product Overview
4WRA(E)-2X is a compact direct‑operated electro‑hydraulic Hydraulic valve, widely used for open‑loop flow and direction control in medium‑precision hydraulic system and automated industrial Machine.
This series contains two variants: 4WRA‑2X requires an external amplifier for drive control, while 4WRAE‑2X is equipped with built‑in onboard electronics (OBE), eliminating extra control units. Without spool position closed‑loop feedback, this proportional Hydraulic valve converts analog electrical signals into stepless hydraulic output, continuously adjusting flow rate and movement direction of hydraulic cylinders and hydraulic motors. It delivers smooth speed regulation and shock‑free switching performance for your hydraulic system, an economical‑efficient precision control solution for small‑and‑medium‑size hydraulic stations, machine‑tools, packaging machinery and general‑purpose automation Machine.
Technical Specifications
‑ Model Series: 4WRA‑2X, 4WRAE‑2X
‑ Product Type: Direct‑operated electro‑hydraulic proportional directional Hydraulic valve, open‑loop control, no spool‑position feedback
‑ Nominal Size: NG6, NG10
‑ Max Working Pressure (P/A/B port): 315 bar; T‑port back‑pressure: 210 bar
‑ Rated Flow: 7‑75 L/min (Δp=10 bar)
‑ Mounting Form: Sub‑plate mounting, ISO 4401 standard installation dimension
‑ Spool function: 4/2‑way, 4/3‑way, spring‑centered
‑ Solenoid: Wet‑pin DC proportional solenoid, detachable coil
‑ Control Mode: 4WRA‑2X: External amplifier control; 4WRAE‑2X: Integrated onboard electronics (OBE), 24VDC power supply, ±10V control signal
‑ Working Medium: Anti‑wear hydraulic mineral oil for industrial hydraulic system
‑ Oil Temperature Range: ‑20℃ ~ +80℃
‑ Feature: Compact‑size, fast dynamic response, low hysteresis, easy wiring, cost‑effective, stable open‑loop regulation for general‑purpose hydraulic Machine
Working Principle
As a direct‑drive proportional Hydraulic valve, 4WRA(E)-2X needs no pilot‑oil supply. After receiving the command electrical signal, the proportional solenoid pushes the main spool to generate a corresponding displacement. By changing the opening area of valve ports, it steplessly adjusts oil flow and flow direction inside the hydraulic system, so as to control the moving speed and direction of hydraulic actuators.
Since there is no closed‑loop feedback for spool position, the control accuracy depends on input signal stability and valve‑body performance. Damaged proportional solenoid, electronic module failure or spool sticking will lead to unstable speed, drifting, slow response of the Machine. Replacing a qualified 4WRA(E)-2X proportional directional valve can restore normal open‑loop control performance of your hydraulic circuit.
Core Advantages
1. Direct‑operated structure without pilot‑oil requirement, simplifying circuit layout for compact‑space hydraulic system.
2. Two optional electric‑control schemes: external amplifier (4WRA‑2X) or built‑in electronics (4WRAE‑2X), flexible to match different control‑cabinet configurations.
3. Standard ISO sub‑plate installation, excellent interchangeability, convenient for upgrading or replacing existing hydraulic system.
4. Low‑hysteresis, high‑repeatability spool‑sleeve pair, achieving smooth, shock‑free speed transition during acceleration‑deceleration of the Machine.
5. Economical‑cost open‑loop proportional solution, balancing control performance and budget for general‑purpose automation equipment.
Application Range
4WRA(E)-2X proportional directional Hydraulic valve is a core open‑loop control component for industrial hydraulic system. It is widely applied to injection‑molding auxiliary machinery, CNC machine‑tools, hydraulic test‑benches, packaging‑processing equipment, conveyor‑handling machinery, small hydraulic presses and other hydraulic‑driven automated Machine. Suitable for hydraulic‑system integrators, equipment‑manufacturers, maintenance workshops and global spare‑parts distributors.
