Bosch Rexroth | 4WRZ10E85-7XM
4WRZ10E85-7X//M
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The 4WRZ10E85-7X//M proportional directional valve is built by Bosch Rexroth for the WRZ Proportional Directional Valves series, providing variable metering of hydraulic flow to cylinders and motors in automated machinery. It delivers a nominal flow of 85 l/min at a 10 bar differential to support mid-range actuator speeds, while the main stage can reach 170 l/min when full capacity is required. Continuous operation is permitted because the solenoid works with a 100 % duty cycle. Electrical drive limits are set by a maximum current of 1.5 A and a coil resistance of 4.8 Ω measured at 20 °C; this combination keeps coil heating within the 150 °C temperature ceiling. The unit withstands main system pressures up to 315 bar, allowing installation in high-pressure circuits common to industrial presses and injection machines. Hydraulic ports a, b, t, t1, and p share an 11 mm diameter, and the mounting face follows the ISO 4401-05-05-0-94 pattern for interchangeability with standard subplates.
Control accuracy is assisted by a maximum hysteresis of 6 %, ensuring consistent spool positioning across repeated command cycles. Environmental sealing reaches IP65 when the mating socket is fitted, so sprayed fluids or dust do not affect the internal electrics. The coil is connected through a DIN EN 175301-803 plug, which simplifies field wiring and allows quick replacement. Pilot stage consumption is modest, drawing 3.5 l/min of oil to move from 0 to 100 % command and filling only 1.7 cm³ during that stroke, features that reduce response time and energy loss. Port Y is rated for 30 bar, enabling external pilot drainage without risking seal damage. The assembly weighs 7.8 kg, allowing single-person handling during maintenance. Overall flow metering is coordinated by the proportional design so closed-loop controllers can modulate actuator speed and direction precisely within automated lines.
Technical Specifications
Coil Resistance (20 °c)
4.8 Ω
Duty Cycle
100%
Electrical Connector
DIN EN 175301-803
Hysteresis (max)
6%
Ingress Protection
IP65 (with socket)
Main Valve Max Flow
170 l/min
Max Coil Temperature
150 °C
Max Current
1.5 A
Max Operating Pressure (main)
315 bar
Max Port Y Pressure
30 bar
Nominal Flow (Δp=10 Bar)
85 l/min
Pilot Oil Flow (0→100% Signal)
3.5 l/min
Pilot Oil Volume (0→100% Signal)
1.7 cm³
Port Diameter (a,b,t,t1,p)
11 mm
Porting Pattern
ISO 4401-05-05-0-94
Weight
7.8 kg
1620 Old Apex Road
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