Bosch Rexroth | H-4WEH25C6X6EW110N9K4
H-4WEH25C6X/6EW110N9K4
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The H-4WEH25C6X/6EW110N9K4 valve is produced by Bosch Rexroth and belongs to the WEH Directional Spool Valves series. It is intended to switch or meter hydraulic flow in automated circuits. The unit is built to the NG25 size and employs a 4-way layout with two spool positions to direct pressure and return lines as required. Port interface follows ISO 4401-08-08-0-05 so it mates with standardized subplates. Service limits include a maximum operating pressure of 350 bar at ports P, A, and B and a rated flow capacity of 650 l/min when oil viscosity is within 2.8 to 500 mm²/s. Acceptable hydraulic fluid temperatures extend from −20 °C to +80 °C, allowing installation in machinery exposed to moderate ambient swings.
For pilot control, the valve uses a high-power 6E solenoid stage that delivers rapid shifting force so the main spool responds quickly under full system flow. It receives pilot oil externally through port X while discharging it externally through port Y. The pilot circuit operates between a minimum of 13 bar and a maximum of 250 bar. Electrical connection is through a DIN EN 175301-803 K4 plug, and a concealed manual override labeled N9 lets personnel shift the spool during commissioning or power loss. Fluid cleanliness must meet ISO 4406 class 20/18/15 to protect the precision lands.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Hydraulic Fluid Temp Range (nbr)
-20 to +80 °C
Manual Override
Concealed (N9)
Max Flow (c, 350 Bar)
650 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-pos, Spring)
13 bar
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Valve Type
6E (High-Power)
Porting Pattern
ISO 4401-08-08-0-05
Size
NG25
Spool Positions
2
Viscosity Range
2.8 to 500 mm²/s
Way Configuration
4-Way
1620 Old Apex Road
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