Bosch Rexroth | 4WEH22GB7X6EG24N9TDAB15
4WEH22GB7X/6EG24N9TDA/B15
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The 4WEH22GB7X/6EG24N9TDA/B15 directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. It is intended to shift hydraulic flow paths in automated circuits where electric signals trigger hydraulic movement. Electro-hydraulic actuation allows solenoids to command the pilot stage while the main spool handles system flow. This model is configured as a 4-way valve so it can connect pressure, tank, and two actuator lines in multiple positions. The NG25 (W.H 22) size defines the mounting interface and determines the flow section needed for medium-capacity manifolds. A 4WE6E pilot valve provides the initial control oil to shift the main spool on receipt of a 24 V DC signal from the machine controller. The assembly withstands operating pressures up to 280 bar on ports P, A, and B, and it can pass as much as 200 L/min at that pressure before reaching its performance limit. It fits a manifold drilled to the ISO 4401-08-08-0-05 pattern to simplify block standardization.
The component belongs to series 7X, indicating internal design revisions that align it with current spare parts and sealing sets. Pilot oil reaches the control stage from an external X connection, while the spent pilot flow returns through the internal T channel, eliminating the need for a separate drain line. A maximum pilot pressure of 210 bar keeps the pilot stage within safe loading, and a minimum of 10.5 bar is required to shift a three-position spring-centered spool. A 1.5 mm throttle insert marked B15 is installed to moderate pilot oil velocity and improve stability during rapid command changes. The valve needs hydraulic fluid filtered to ISO 4406 20/18/15 to protect sliding surfaces and maintain repeatable switching. With a mean time to dangerous failure of 100 years, the unit offers long service intervals in continuous duty environments.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Component Series
7X
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (3-pos Spring)
10.5 bar
Mttfd
100 years
Performance Limit (g, 280 Bar)
200 l/min
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Pilot Valve Type
4WE6E
Porting Pattern
ISO 4401-08-08-0-05
Rated Voltage
24 V DC
Size
NG25 (W.H 22)
Throttle Insert
1.5 mm (B15)
Valve Version
4-way
1620 Old Apex Road
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