Bosch Rexroth | 4WH6Y5XV-SO135
4WH6Y5X/V/ SO135
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The 4WH6Y5X/V/ SO135 valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is intended for hydraulic automation tasks that require precise flow routing. It uses hydraulic actuation so system pressure moves the spool without additional electrical hardware. Nominal size 6 defines the interface dimensions, while a subplate mounting style allows removal without disturbing fixed piping. The ISO 4401-03-02-0-05 porting pattern guarantees manifold interchangeability, and four ports support control of double-acting cylinders. A pilot volume of 1.23 cm³ keeps control oil demand low, and FKM seal material resists mineral oils under elevated heat. Cleanliness class ISO 4406 (20/18/15) limits particulate contamination to preserve smooth spool travel.
The valve tolerates 315 bar on pressure ports A, B, and P, enabling use in high-pressure circuits. Pilot lines may reach 200 bar, while the tank port is restricted to 160 bar to protect return paths. A maximum flow rate of 60 l/min makes the unit suitable for medium-capacity actuators, and it accepts oils up to 500 mm²/s viscosity so thicker fluids can be used during cold starts. Permitted fluid temperature spans from -20 °C to 80 °C when FKM seals are installed, covering typical mobile and industrial ranges. Switching frequency can reach 7 200 cycles per hour, allowing rapid directional changes in servo logic or accumulator charging systems.
Technical Specifications
Actuation
Hydraulic
Cleanliness Class
ISO 4406 (20/18/15)
Max Flow
60 l/min
Max Fluid Temperature (fkm)
80 b b b b b bC
Max Operating Pressure (a/b/p)
315 bar
Max Pilot Pressure
200 bar
Max Pressure (t)
160 bar
Max Switching Frequency
7200 1/h
Max Viscosity
500 mm b2/s
Min Fluid Temperature (fkm)
-20 b b b b b bC
Mounting Type
Subplate
Nominal Size
6
Number Of Ports
4
Pilot Volume
1.23 cm b3
Porting Pattern
ISO 4401-03-02-0-05
Seal Material
FKM
1620 Old Apex Road
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