ChangJia Hydraulic Proportional Valve Hydraulic Proportional Valve From China

Product Overview

- A directional proportional hydraulic valve (Type 4WRE) from ChangJia (China) for subplate mounting, combining proportional solenoids with an LVDT position transducer for closed‑loop position/flow control.

- Available in two nominal sizes to suit medium and high flows (typical flows ~65 and ~260 L/min) and designed to the DIN/ISO/CETOP mounting patterns for easy integration.

- Designed for continuous operation with IP65 protection and DC coil options (12/24 V).

Product Features

- Proportional control of both flow and direction using direct‑operated solenoids and a spring‑centred spool.

- Electrical position feedback (LVDT) and onboard electronics allow closed‑loop position control (comparator of command vs. actual spool position).

- Low pressure drop across control lands, low hysteresis (

- Robust hydraulic ratings (ports A/B/P up to ~31.5 MPa, tank port lower), wide fluid viscosity and temperature ranges, and fine contamination tolerance (recommend ≤10–20 μm).

- Standardized mounting (DIN 24340 / ISO 4401 / CETOP‑RP121H), available amplifier options and IP65 valve insulation.

Product Value

- Enables precise, proportional control of actuator speed and direction, improving machine accuracy and process consistency.

- Integrated valve + matched electronic control from one supplier simplifies system setup, tuning and after‑sales support.

- Reduces energy waste and cycle variability by accurately matching flow to demand and minimizing pressure losses.

- Durable design and standard interfaces shorten installation time and lower lifecycle maintenance costs.

Product Advantages

- High control quality: very low hysteresis and excellent repeatability for precise positioning and flow regulation.

- Fast, stable dynamic response (multi‑Hz bandwidth) suitable for demanding hydraulic control tasks.

- Flexible installation: industry standard mounting, two size/flow options, and compatible amplifier modules.

- Rugged construction and environmental protection (IP65) for reliable field service in industrial environments.

- Backed by ChangJia’s R&D and production capabilities for consistent quality and one‑stop supply of valves and electronics.

Application Scenarios

- Industrial hydraulic motion control: presses, CNC machines, test rigs and material handling systems requiring accurate speed/position control.

- Mobile and construction machinery where proportional directional control improves operator control and equipment performance.

- Plastic injection molding, die casting and forming lines that need repeatable, proportional flow control.

- Process automation and tooling systems that require closed‑loop hydraulic positioning and fast dynamic response.

- Any hydraulic system needing retrofit or new installations using DIN/ISO/CETOP standard subplate mounting and integrated electronics.