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Proportional Directional Valve Rexroth Interchangeable

Proportional Directional Valve 4WRZ

MANUFACTURER Genuine Huade Hydraulic
STANDARDS ISO 4401 / DIN 24340
AVAILABILITY Factory Direct Stock
Proportional Directional Valve 4WRZ
Proportional Directional Valve 4WRZ - Image 2
Proportional Directional Valve 4WRZ - Image 3
Proportional Directional Valve 4WRZ - Image 4
TECHNICAL REPLACEMENT NOTICE

This Huade® directional control valve serves as a 100% direct drop-in replacement for Bosch Rexroth PROPORTIONAL-DIRECTIONAL-VALVE-4WRZ equivalents. Dimensions, mounting interfaces, and technical parameters are identical. Designed for cost reduction in industrial and mobile hydraulic systems.

• Product features:DIN 24 340 form A,ISO4401
• Specifications: 4WRZ series,
• Applications:light industry, mining, engineering

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ISO 4401 Mounting ISO 4401 / Rexroth interchangeable
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Technical Data Sheet

  • Product Overview
  • Features & Applications
  • Technical Parameters

Product Overview

The proportional directional valve 4WRZ adopts plate connection, which has the same connection size as the common reversing valve of the same diameter. It is easy to install and debug. The main valve of  Huade® 4WRZ proportional valve is spring-centered. The main valve core has no drift, high repeatability and good reliability. The valve is CE certificated.  

Up to 10 (over 10 must install ZDR6DP2-30B/75YM)

Pilot oil volume(cm3) or spool movement 0~100%

Pilot oil flow at port X or Y (L/min) for spool movement 0~100%

Mineral oil(for NBR seal).Phosphate ester (for FPM seal)

Key Features

  • Pilot WRZ proportional valve
  • For subplate mounting
  • For the control of both direction and flow rate of a hydraulic fluid
  • Spring centred .no spool drift
  • Low pressure drop across control lands
  • Valve and electronic control from one source
  • Proportional solenoid operation
  • Porting pattern to DIN 24 340 form A,ISO4401 and CETOP-RP121H

Industrial Applications

  • Type 4WRZ proportional directional valve is widely used in various industries such as machine tools, metallurgy, light industry, mining, engineering, etc.
  • Valve types 4WRZ... are 4- way valves operated by means of proportional solenoids. They control the direction and flow rate of hydraulic fluid.
  • They basically consist of the pilot valve (3),the main valve (7) with the main spool (8),and the centering spring (9).
  • If solenoid ‘B’ is energized, pilot spool (4) is moved to the right.Pilot oil is then either fed internally from port P, or ‘externally’ from port X via the pilot valve (3) into the pressure chamber(10) and moves the main spool (8) a distance proportional to the strength of the electrical current.The throttling grooves in the main spool open progressively with increasing current, thus controlling the flow of hydraulic fluid to the actuator ports.
  • When the electrical signal is switched off, both the pilot spool (4) ,and the main spool (8) return to neutral independent of the control pressure supply. An emergency hand operator permits movement of the pilot spool position without energizing the solenoids
  • Structure of Proportional Directional Valve 4WRZ
  • Pilot valve
  • The pilot valve is a proportional solenoid operated 3-way pressure reducing valve(type 3DREP6).Throttle insert are installed in port A and B,further details see the text of 3DREP6
  • Structure of pilot valve type 3DREP6
  • Symbol of Proportional Directional Valve 4WRZ

Technical Parameters

Mechanical ratings and operating limits for the Proportional Directional Valve 4WRZ:

Parameter / Dimension Name Value / Rating Specification
Hydraulic data Hydraulic data
size - 10 - 16 - 25 32
pilot valve pressure (MPa) - external pilot oil supply - 3 to 10 3 to 10
pilot valve pressure (MPa) - internal pilot oil supply - Up to 10 (over 10 must install ZDR6DP2-30B/75YM) Up to 10 (over 10 must install ZDR6DP2-30B/75YM)
Main valve pressure (MPa) - 31.5 - 35 35
Return pressure (MPa) - port T (external pilot oil return) - 31.5 - 25 15
Return pressure (MPa) - port T (internal pilot oil return) - 3 3
Return pressure (MPa) - port Y - 3 3
Pilot oil volume(cm3) or spool movement 0~100% - 1.7 - 4.6 - 10 26.5
Pilot oil flow at port X or Y (L/min) for spool movement 0~100% - 3.5 - 5.5 - 7 15.9
Flow through main valve (L/min) - 270 - 460 - 877 1600
Hysteresis (L/min) - 6 6
Repeatability (%) - 3 3
degree of contamination(㎛) - ≤20 ≤20
Fluid - Mineral oil(for NBR seal).Phosphate ester (for FPM seal) Mineral oil(for NBR seal).Phosphate ester (for FPM seal)
Viscosity range(mm ²/s) - 2.8 to 380 2.8 to 380
Fluid temperature range (℃) - -20 to +70 -20 to +70
Mounting position - optional optional
Weight (kg) - valve with one solenoid - 7.4 - 12.7 - 17.5 41.8
Weight (kg) - valve with two solenoids - 7.8 - 13.4 - 18.2 42.2

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