4WRLE Series Proportional Directional Valve
Product Overview
4WRLE Series Proportional Directional Valve is a high‑flow, high‑dynamic pilot‑operated two‑stage electro‑hydraulic Hydraulic valve, widely used for high‑precision closed‑loop control in heavy‑duty hydraulic system and large‑power industrial Machine[(Bosch Rexr...)].
This high‑performance proportional Hydraulic valve is equipped with main‑spool electrical position closed‑loop feedback and built‑in onboard electronics (OBE). It converts analog electrical control signals into infinitely‑variable hydraulic output, continuously adjusting oil flow rate, flow direction, acceleration and deceleration of hydraulic cylinders and hydraulic motors. Featuring large‑flow capacity, fast dynamic response, low hysteresis and excellent repeat accuracy, it delivers stable and reliable speed, position and force regulation for the whole hydraulic system. It is the ideal high‑end control component for large‑tonnage, heavy‑load automated Machine.
Technical Specifications
‑ Model Series: 4WRLE‑4X
‑ Product Type: Pilot‑operated two‑stage high‑flow electro‑hydraulic proportional directional Hydraulic valve, closed‑loop main‑spool position feedback, integrated onboard electronics (OBE)
‑ Nominal Sizes: NG10, NG16, NG25, NG27, NG35[(Bosch Rexr...)]
‑ Max working pressure (P/A/B ports): 350 bar
‑ Return port T pressure: Up to 210 bar
‑ Rated flow range: 60‑1500 L/min
‑ Mounting: Sub‑plate mounting, ISO 4401 standard installation dimension
‑ Spool configuration: 4/3‑way, spring‑centered, multiple spool functions available
‑ Power supply: 24 VDC
‑ Control signal: Analog ±10 V / 4‑20mA
‑ Working medium: Anti‑wear hydraulic mineral oil for industrial hydraulic system
‑ Oil temperature range: ‑20℃ ~ +80℃
‑ Key Features: Large‑flow throughput, fast response speed, high closed‑loop precision, pressure‑balanced main spool, strong anti‑pollution ability, long service life for heavy‑load hydraulic Machine
Working Principle
4WRLE proportional Hydraulic valve consists of a pilot stage, main spool assembly and integrated electronic control unit. After receiving the electrical command signal, the proportional pilot solenoid drives the pilot spool to output pilot pressure. The main‑spool displacement sensor feeds real‑time position signal back to the onboard amplifier to form full closed‑loop regulation. The pilot oil pushes the main spool to shift steplessly, changing valve‑port opening area and oil‑flow direction inside the hydraulic system, thus precisely controlling the movement speed, direction and positioning of hydraulic actuators.
Damage to position sensor, failure of proportional solenoid or breakdown of onboard electronic module will cause unstable speed, vibration, position drift and slow response of the Machine. Replacing a qualified 4WRLE proportional directional valve can restore high‑precision closed‑loop control performance of your hydraulic circuit.
Core Advantages
1. Main‑spool closed‑loop position feedback provides excellent repeatability and control stability, greatly improving regulation accuracy of the hydraulic system.
2. Two‑stage pilot‑operated structure supports ultra‑large‑flow and high‑pressure output, perfectly matching heavy‑duty, high‑power industrial Machine.
3. Built‑in onboard electronics (OBE), no external amplifier required, simplifying wiring and installation of your hydraulic system.
4. Pressure‑balanced main‑spool design reduces switching impact, realizing smooth, shock‑free acceleration‑deceleration performance.
5. Standard ISO sub‑plate installation, good interchangeability, convenient for upgrade or replacement of existing large‑flow hydraulic equipment.
Application Range
4WRLE Series proportional directional Hydraulic valve is a premium core control component for large‑flow, high‑dynamic closed‑loop industrial hydraulic system. It is widely applied to heavy‑duty hydraulic presses, die‑casting machinery, large‑scale injection‑molding machines, metallurgical rolling‑mill equipment, rotary‑drilling‑rig servo systems, hydraulic test‑benches and other high‑power hydraulic‑driven Machine. Suitable for high‑end hydraulic‑system integrators, heavy‑equipment‑manufacturing factories, maintenance workshops and global spare‑parts distributors.
