Bosch Rexroth | 4WRZ10W8-85-7XETV
4WRZ10W8-85-7X/ET/V
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The 4WRZ10W8-85-7X/ET/V valve belongs to the WRZ Proportional Directional Valves series and is manufactured by Bosch Rexroth for closed-loop hydraulic automation. It regulates spool position with a solenoid whose coil shows 4.8 Ω resistance at 20 °C, rising to 7.2 Ω when hot; these values stabilize current draw across temperature changes. Continuous operation is supported by a 100 % duty cycle, while a permitted current of 1.5 A allows the electronics to develop the magnetic force needed for accurate metering at a nominal flow of 85 l/min under a 10 bar pressure drop. The winding insulation endures up to 150 °C, extending service life in warm manifolds, and the IP65 housing blocks dust and low-pressure water jets in harsh plant environments. With a mass of 7.8 kg, the unit mounts securely on sub-plates without additional supports.
In hydraulic circuits the valve tolerates a main pressure of 315 bar and limits return flow at the T port to 30 bar so downstream components remain within ratings. It is designed for mineral oil of the HL or HLP classification, and maintains performance only when the oil cleanliness stays at 20/18/15 per ISO 4406(c) to prevent spool wear. Both pilot oil supply and drain are internal, eliminating external lines and simplifying manifold drilling, while ports X and Y are plugged on this ET version to reduce leakage paths. Sealing is achieved with FKM elastomers that resist common hydraulic fluids, completing a construction suited to continuous proportional control duties.
Technical Specifications
Coil Resistance (20 °c)
4.8 Ω
Coil Resistance (max Hot)
7.2 Ω
Duty Cycle
100%
Fluid Cleanliness (main Valve)
20/18/15 (ISO 4406(c))
Hydraulic Fluid
Mineral Oil (HL, HLP)
Max Coil Temperature
150 °C
Max Current
1.5 A
Max Operating Pressure (main)
315 bar
Max T Port Pressure (et)
30 bar
Nominal Flow (Δp=10 Bar)
85 l/min
Pilot Oil Drain
Internal
Pilot Oil Supply
Internal
Ports X And Y
Plugged (ET)
Seal Material
FKM
Type Of Protection
IP65
Weight
7.8 kg
1620 Old Apex Road
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