Bosch Rexroth | 4WRH25E1-325-7XV
4WRH25E1-325-7X//V
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The 4WRH25E1-325-7X//V valve is produced by Bosch Rexroth for the WRZ Proportional Directional Valves series and meters hydraulic flow in automated machinery. It is built in size 25, a format that sets both flow capacity and mounting envelope. The subplate mounting simplifies installation by letting the valve sit on a standardized manifold surface. A porting pattern of ISO 4401-08-07-0-94 aligns the ports with common industrial subplates for interchangeability. Under a pressure drop of 10 bar the unit passes a nominal flow of 325 l/min, providing predictable performance in control loops, while the main stage can reach 870 l/min to satisfy high-demand circuits. The housing withstands 350 bar of operating pressure so it can drive high force actuators without damage. An accepted viscosity range of 20 to 380 mm²/s accommodates fluids that vary with temperature and load, and the required hydraulic medium is mineral oil of the HL or HLP classes defined in DIN 51524.
External pilot oil supply isolates control pressure from the main line for stable spool positioning, and the pilot circuit may be pressurized to 25 bar to generate adequate shifting force. Port Y is rated for 30 bar to evacuate pilot oil without overstressing the return line, whereas port T tolerates backflow pressures up to 250 bar for systems with elevated return resistance. A cleanliness level of 20/18/15 according to ISO 4406 is specified to prevent jamming of precision metering edges, and the permitted fluid temperature range from −20 °C to +80 °C supports cold starts and heated reservoirs. FKM seals identified by the suffix V resist the specified fluid and high temperature for long service life. Finally, hysteresis is held to 6 percent or less to minimize position error and ensure repeatable directional control.
Technical Specifications
Cleanliness Class (main)
20/18/15 (ISO 4406)
Fluid Temperature Range
-20 to +80 °C
Hydraulic Fluid
Mineral Oil (HL, HLP) DIN 51524
Hysteresis
<= 6%
Max Flow (main Valve)
870 l/min
Max Operating Pressure (main Valve)
350 bar
Max Pilot Pressure (main Valve)
25 bar
Max Pressure, Port Y
30 bar
Mounting
Subplate
Nominal Flow (Δp 10 Bar)
325 l/min
Pilot Oil Supply
External
Porting Pattern
ISO 4401-08-07-0-94
Return Flow Pressure, Port T
250 bar
Seals
FKM (V)
Size
25
Viscosity Range
20 to 380 mm2/s
1620 Old Apex Road
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