Bosch Rexroth | H-4WH32G6XS2V
H-4WH32G6X/S2/V
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The H-4WH32G6X/S2/V directional spool valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation tasks that require precise flow routing. The valve is pressure-centered, so the spool returns to its neutral position once control pressure is removed. A minimum pilot pressure of 8.5 bar is necessary to shift the spool, ensuring dependable actuation in low-pressure start-up conditions. The ports p, A, and B are rated for 350 bar, permitting use in high-pressure circuits, while a maximum flow of 1100 l/min allows large volume transfer with limited restriction. Installation is simplified by the ISO 4401-10-09-0-05 mounting interface, and the subplate mounting style removes the need for threaded pipe connections. Pilot oil is introduced externally through port X and is returned externally through port Y, preventing interaction between pilot and main pressures.
Control parameters are equally robust on the secondary side: pilot pressure may reach 250 bar, permitting the control stage to function reliably in systems with elevated supply pressure, and pilot return pressure up to 250 bar accommodates back-pressure in drain lines. A pilot flow requirement of 45 l/min yields the shortest switching time, and the S2 switching-time adjustment lets technicians refine response without mechanical changes. The valve demands hydraulic fluid cleanliness of ISO 4406 class 20/18/15 to limit wear on critical sealing lands. A surface coating thickness up to 100 µm resists corrosion in harsh environments. Finally, the calculated mean time to dangerous failure is 150 years, providing a long service life for safety-relevant machinery.
Technical Specifications
Centering Type
Pressure-Centered
Hydraulic Fluid Cleanliness
ISO 4406 20/18/15
Max Flow
1100 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y)
250 bar
Max Surface Coating Thickness
100 µm
Min Pilot Pressure (pressure-centered)
8.5 bar
Mounting Interface
ISO 4401-10-09-0-05
Mounting Style
Subplate
Mttfd
150 years
Pilot Flow For Shortest Switching Time
45 l/min
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Switching Time Adjustment
S2
1620 Old Apex Road
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