Bosch Rexroth | 4WEH22H7X6EW110N9DK25L
4WEH22H7X/6EW110N9DK25L
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The 4WEH22H7X/6EW110N9DK25L valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth. It shifts spool positions with hydraulic pilot pressure to route flow and actuate cylinders in automated machinery. The NG25 (W.H 22) size establishes port dimensions that suit medium-to-high flow circuits. During operation, channels p, A, and B withstand up to 350 bar, allowing the valve to manage high-pressure drives. A rated throughput of 450 l/min supports fast actuator motion without excessive pressure drop. The hydraulic medium should meet ISO 4406(c) 20/18/15 cleanliness so internal lands remain free of contamination wear. Bosch Rexroth limits fluid temperature to 80 °C to protect seals and maintain viscosity stability. Viscosity may reach 500 mm²/s at cold start yet still be accommodated by the clearances in the spool assembly. Installation uses subplate mounting, and the housing matches the ISO 4401-08-08-0-05 pattern to fit standard manifold blocks.
The control section accepts pilot pressure up to 210 bar, enabling remote actuation without oversizing the pilot lines. Reliable switching at the shortest time is aided by a pilot flow of 35 l/min, while a two-spool configuration displaces 15.28 cm³ of pilot oil per stroke. Correct lubrication is retained when fluid viscosity falls to the minimum 2.8 mm²/s, ensuring the valve can operate with warm, low-viscosity fluids. Attachment to the manifold uses six M12 × 60 screws, and each bolt should be tightened to 100 Nm with a ±10 % tolerance to avoid leakage or casting distortion. A single-solenoid version weighs 11.5 kg, which is manageable for manual handling during maintenance. Functional safety is reflected by an MTTFd of 100 years, aligning the component with long service life expectations in continuous industrial duty.
Technical Specifications
Fluid Cleanliness Class
ISO 4406(c) 20/18/15
Hydraulic Fluid Temp Max
80 °C
Max Flow
450 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
210 bar
Max Viscosity
500 mm2/s
Min Viscosity
2.8 mm2/s
Mounting Pattern
ISO 4401-08-08-0-05
Mounting Screws
M12 × 60 (6 pcs)
Mounting Type
Subplate Mounting
Mttfd Value
100 years
Pilot Flow (shortest Switching)
35 l/min
Pilot Volume (2-spool)
15.28 cm3
Screw Tightening Torque
100 Nm ±10%
Valve Size
NG25 (W.H 22)
Weight (one Solenoid)
11.5 kg
1620 Old Apex Road
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