Bosch Rexroth | H-4WEH25J6X6EG24N9K4-CSA
H-4WEH25J6X/6EG24N9K4 CSA
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The H-4WEH25J6X/6EG24N9K4 CSA is a valve in the WEH Directional Spool Valves series produced by Bosch Rexroth for hydraulic automation where reliable flow control is required. The valve uses electro-hydraulic actuation, allowing an electrical signal to trigger hydraulic pilot flow that moves the main spool. A 24 V DC coil powers the solenoid so the electronics can run on common machine control voltage. Pilot oil is supplied externally through port X, isolating control pressure from the main line. Pilot lines may be pressurized up to 250 bar, giving ample force to shift the spool under full load. For three-position spring-centered models, at least 13 bar pilot pressure is needed to return the spool to center. The NG25 size sets the port geometry for medium-capacity manifolds. With a J spool at 350 bar, the valve can pass 520 l/min, supporting large actuator speeds.
Subplate mounting lets the valve be installed on standardized manifolds without additional plumbing. The porting pattern follows ISO 4401-08-08-0-05, ensuring compatibility with common NG25 base plates. A required oil cleanliness of ISO 4406 (c) 20/18/15 prevents premature wear of the precision spool and seats. The solenoid terminals use the DIN EN 175301-803 K4 connector, providing a sealed plug interface for quick wiring changes. A concealed manual override is included so technicians can shift the valve during commissioning without exposing delicate components. Work ports P, A, and B tolerate continuous pressures up to 350 bar, supporting high force cylinders. The pilot oil return path withstands 210 bar, allowing backpressure from remote tank lines. Mounting screws are tightened to 100 Nm with a ±10 percent tolerance to secure the valve against vibration. An MTTFd of 100 years contributes to long service intervals in safety-related systems.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed
Max Flow (j Spool, 350 Bar)
520 l/min
Maximum Pilot Pressure
250 bar
Min Pilot Pressure (3-pos, Spring-centered)
13 bar
Mounting Screw Tightening Torque
100 Nm ±10%
Mounting Type
Subplate
Mttfd
100 years
Operating Pressure (p, A, B)
350 bar
Pilot Oil Return Max Pressure
210 bar
Pilot Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Size
NG25
Supply Voltage
24 V DC
1620 Old Apex Road
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