Bosch Rexroth | 4WEH22D7X6EW110N9DALB10
4WEH22D7X/6EW110N9DAL/B10
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The 4WEH22D7X/6EW110N9DAL/B10 directional spool valve is produced by Bosch Rexroth and belongs to the WEH Directional Spool Valves series. It serves to switch hydraulic flow paths in automated machinery. The valve offers a 4/2-way function under symbol D so it alternates between two spool positions to connect or block pressure and tank lines. A nominal size of NG25 defines the port dimensions and supports medium-frame manifold layouts. The rated flow capacity reaches 450 l/min, allowing the unit to pass large volumes without excessive pressure loss. Maximum operating pressure at ports P, A, and B is 280 bar, enabling high-pressure circuits. Secondary pilot outlet D3 is limited to 45 bar to protect downstream components. Pilot control tolerates up to 210 bar, giving flexibility in selecting pilot sources. Reliable shifting starts at 11 bar with the two-spring spool, securing function in low-pressure pilot systems. A required pilot flow of 35 l/min achieves the shortest switching time and minimizes cycle delays.
Subplate mounting lets the valve drop onto a standardized base for quick replacement. The interface follows ISO 4401-08-08-0-05, ensuring port alignment with common NG25 manifolds. An internal throttle insert 1.0 mm in diameter, designated B10, meters pilot oil to balance speed and stability. A concealed manual override is present so maintenance personnel can shift the spool without exposing the control to accidental activation. Mineral-oil media such as HL, HLP, HLPD, HVLP, and HVLPD can be used, supporting traditional hydraulic power units. Biodegradable fluids HETG, HEES, and HEPG are also permitted, enabling environmentally sensitive installations. Fire-resistant types HFDU, HFDR, and HFC expand compatibility where ignition risk is a concern. The mean time to dangerous failure is 100 years, providing a long safety margin in continuous duty applications.
Technical Specifications
D3 Secondary Pressure
45 bar
Hydraulic Fluids (bio)
HETG, HEES, HEPG
Hydraulic Fluids (fire-resist.)
HFDU, HFDR, HFC
Hydraulic Fluids (mineral Oil)
HL, HLP, HLPD, HVLP, HVLPD
Manual Override
Concealed
Max Flow (symbol D)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (2-spool Spring)
11 bar
Mounting Type
Subplate
Mttfd
100 years
Nominal Size
NG25
Pilot Flow For Shortest Switch Time
35 l/min
Porting Pattern
ISO 4401-08-08-0-05
Throttle Insert
Ø1.0 mm (B10)
Valve Function
4/2-Way (Symbol D)
1620 Old Apex Road
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