Bosch Rexroth | 4WH6Y5X
4WH6Y5X/
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The 4WH6Y5X/ directional spool valve is built by Bosch Rexroth within the WEH Directional Spool Valves series. It directs pressure and return flow in automated hydraulic manifolds. The valve is hydraulically actuated, so pilot oil moves the spool instead of a mechanical or solenoid drive. Its nominal size is 6, matching standard cavity dimensions for compact power units. The body attaches to a subplate, and the sealing face follows the porting pattern specified by DIN 24340 Form A as well as ISO 4401-03-02-0-05 for interchangeability with common manifolds. Installation can be made in any position, while a locating pin conforming to ISO 8752-3×8-St prevents misalignment during assembly. Four M5 × 50 screws per ISO 4762 secure the housing, and the recommended tightening torque is 7 Nm to protect the gasket surface without overstressing the threads. These mechanical features define how the component is fixed and oriented inside a hydraulic control block.
Flow performance and control limits are set for reliable circuit operation. The spool passes up to 60 l/min without exceeding the pressure drop specified for this model, and the main ports withstand operating pressures as high as 315 bar. The tank port is rated separately to 160 bar so back-pressure in return lines stays within safe limits. Pilot operation requires an external supply between 6 bar and 200 bar; this range ensures positive actuation while avoiding seal overload. During each shift the valve moves a pilot volume of 1.23 cm³, a figure used when sizing accumulator capacity in rapid cycling systems. Switching speed is moderated by a maximum frequency of 2 Hz, helping designers match valve response to machine timing without inducing hydraulic shock. Together these hydraulic values define the valve’s functional envelope and guide selection for presses, test rigs, and other automated installations.
Technical Specifications
Actuation Type
Hydraulic
Installation Position
Any
Locating Pin
ISO 8752-3×8-St
Max Flow
60 l/min
Max Operating Pressure
315 bar
Max Switching Frequency
2 Hz
Max Tank Port Pressure
160 bar
Maximum Pilot Pressure
200 bar
Minimum Pilot Pressure
6 bar
Mounting Screw Size
M5 × 50 (ISO 4762)
Mounting Screw Torque
7 Nm
Mounting Type
Subplate
Nominal Size
6
Pilot Volume
1.23 cm³
Porting Pattern (din)
DIN 24340 Form A
Porting Pattern (iso)
ISO 4401-03-02-0-05
1620 Old Apex Road
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