Bosch Rexroth | 4WEH32Q6X6EW110N9K4
4WEH32Q6X/6EW110N9K4
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The 4WEH32Q6X/6EW110N9K4 is a directional spool valve in the WEH Directional Spool Valves series manufactured by Bosch Rexroth for hydraulic automation tasks that require fast flow reversal and controlled pilot operation. The unit is built to the nominal size 32 so it fits manifolds designed for large flow circuits. Its porting pattern follows ISO 4401-10-09-0-05, which standardizes the interface and simplifies block mounting. At 70 bar the valve allows a maximum flow of 1100 l/min, supporting high-volume actuators. Working lines P, A, and B can be pressurized up to 280 bar, while the return port T withstands 250 bar and the external drain port Y is limited to 160 bar; these limits define safe operating envelopes for the circuit designer. A minimum pilot pressure of 8.5 bar is needed to shift the spool when an external pilot source is used, and a three-position spring-centered design requires a pilot oil volume of 29.4 cm³ for each actuation.
In operation the hydraulic fluid must meet a cleanliness level of 20/18/15 per ISO 4406 to prevent premature wear of the spool and seals. Pilot oil is supplied and returned externally, allowing the main ports to handle contaminated or high-pressure media without influencing the control stage. The pilot stage can accept up to 250 bar, providing ample force to overcome flow forces in the main spool. Electrical actuation is provided through a DIN EN 175301-803 connector coded K4, enabling quick replacement of solenoids in the field. Correct mounting requires tightening the valve screws to 340 Nm to secure the body against the manifold. With two solenoids and the spring-centered option the valve weighs 41.0 kg, a factor to consider when selecting support brackets. The mean time to dangerous failure is 100 years, indicating long functional reliability, and the zero-position cross-section of 78 mm² defines the residual leakage path when the spool is centered.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Max Flow (symbol Q, 70 Bar)
1100 l/min
Max Pilot Pressure
250 bar
Max Pressure Port P/a/b
280 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (external, Ac)
160 bar
Min Pilot Pressure (x External)
8.5 bar
Mounting Screw Torque
340 Nm
Mttfd
100 years
Nominal Size (ng)
32
Pilot Oil Supply/return
External/External
Pilot Volume (3-spool, Spring-centered)
29.4 cm³
Porting Pattern
ISO 4401-10-09-0-05
Weight (2 Solenoids, Spring-centered)
41.0 kg
Zero-pos Cross-section (q A–t/b–t)
78 mm²
1620 Old Apex Road
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