Bosch Rexroth | 4WP6H6X
4WP6H6X/
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The 4WP6H6X/ directional spool valve belongs to the WP Pneumatic Spool Valves series manufactured by Bosch Rexroth. It is intended to route pressure and return lines in hydraulic automation circuits, and it uses pneumatic actuation to shift the spool without electric coils. A size 6 envelope provides a compact footprint while keeping flow passages large enough for a peak flow rate of 60 l/min in medium-capacity manifolds. The valve mounts on subplates that follow the DIN 24340 Form A porting pattern, so it can replace other components with the same interface. Its pressure boundaries support 315 bar on the service ports and supply line, whereas the tank port is limited to 160 bar to protect return plumbing. Process fluids may reach viscosities up to 500 mm²/s without impairing reliable switching, which helps when the circuit operates at low temperatures.
The spool shifts when an external air pilot within 4 bar to 10 bar is applied, giving designers flexibility to use plant compressed-air networks; the pilot chamber holds 4.24 cm³, so only a brief pulse is required to complete a stroke. A maximum switching frequency of 7,200 cycles per hour allows the valve to track rapid command sequences in high-speed press or test stands. It can be installed in any orientation, which simplifies manifold layout inside tight cabinets. The valve meets ISO 4406 cleanliness class 20/18/15, indicating the fluid must be filtered to that level to avoid spool erosion and sticking. These characteristics, combined with pneumatic actuation, let the 4WP6H6X/ integrate into demanding hydraulic automation systems where electrical actuation is not feasible.
Technical Specifications
Actuation Type
Pneumatic
Cleanliness Class
ISO 4406 20/18/15
Installation Position
Any
Maximum Flow
60 l/min
Maximum Operating Pressure (a/b/p)
315 bar
Maximum Pilot Pressure
10 bar
Maximum Switching Frequency
7200 1/h
Maximum Tank Port Pressure (t)
160 bar
Minimum Pilot Pressure
4 bar
Pilot Volume
4.24 cm3
Porting Pattern
DIN 24340 Form A
Size
6
Valve Type
Directional Spool Valve
Viscosity Upper Limit
500 mm2/s
1620 Old Apex Road
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