Bosch Rexroth | 4WH32G6X
4WH32G6X/
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The 4WH32G6X/ valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth and provides hydraulic automation with four-way control of pressure and return lines. The nominal size NG32 offers large internal passages, and with symbol G it passes up to 650 l/min at 280 bar, supporting high-speed cylinders and motors. A maximum operating pressure of 280 bar on ports P, A, and B suits medium-pressure power units, while the spool begins to shift once an external pilot supply of 8.5 bar is available. Pilot oil enters through port X so control pressure remains isolated from main flow, and it returns through external port Y to avoid back-pressure on the spool. The ISO 4401-10-09-0-05 porting pattern standardizes the interface, ensuring replacement compatibility within stacked manifolds.
An oil cleanliness level of 20/18/15 per ISO 4406 is specified to prevent wear in the precision-ground spool bore. Subplate mounting streamlines service, and six M20 × 80 ISO 4762 bolts secure the body; each bolt is tightened to 340 Nm to sustain dynamic loads. The mating surface must remain within 0.01 mm flatness over every 100 mm and a roughness not exceeding Rz 4 µm to keep seal compression uniform. Pilot circuits may reach 250 bar without overstressing the control ports, and the same 250 bar limit applies to the external Y return so back-pressure ratings stay consistent throughout the system. These installation, pressure, and cleanliness parameters establish the operating envelope for the 4WH32G6X/ directional valve.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Max Flow (symbol G, 280 Bar)
650 l/min
Max Operating Pressure (p/a/b)
280 bar
Max Pilot Pressure
250 bar
Max Pressure (port Y External)
250 bar
Min Pilot Pressure (3-pos Spring-centered)
8.5 bar
Mounting Bolts
6 x M20 x 80 (ISO 4762)
Mounting Type
Subplate
Nominal Size
32 (NG32)
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-10-09-0-05
Sealing Surface Flatness
0.01 mm/100 mm
Sealing Surface Roughness
Rzmax 4 µm
Tightening Torque (mounting Bolts)
340 Nm
Way Configuration
4-Way
1620 Old Apex Road
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