Bosch Rexroth | H-4WEH16G7X6EG24N9S2K4
H-4WEH16G7X/6EG24N9S2K4
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The H-4WEH16G7X/6EG24N9S2K4 directional spool valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth. It directs hydraulic flow through a porting interface that complies with ISO 4401-07-07-0-05 and supports line pressures of up to 350 bar on ports P, A, and B. The NG16 flow channel carries as much as 300 l/min, making the valve suitable for high-volume circuits. An internal pilot supply identified as E feeds the control stage, and at least 4.5 bar is needed to shift the spool. Achieving the shortest switching time calls for 35 l/min of pilot flow, while the pilot return is routed externally by port Y so tank backpressure does not influence the control chamber. Hydraulic fluid cleanliness must meet ISO 4406 20/18/15 to minimize wear on the sliding members.
A DIN EN 175301-803 K4 electrical connector links the solenoids to the control system. Switching time can be tuned with discharge control S2, allowing response adjustment without altering hardware. Each three-position actuation displaces 5.72 cm³ of pilot oil, a value used when sizing pilot accumulators or drains. Pilot pressure may rise to 250 bar, port T can withstand 250 bar, and the external drain at port Y must remain below 210 bar to protect the seals. Four M10 × 60 mounting bolts to ISO 4762 secure the housing, and they must be tightened to 58 Nm to maintain the seal without overstressing the manifold interface.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Max Flow (ng16)
300 l/min
Max Pilot Pressure
250 bar
Max Pressure P/a/b
350 bar
Max Pressure Port T (y External)
250 bar
Max Pressure Port Y (external, Dc)
210 bar
Min Pilot Pressure (x Internal)
4.5 bar
Mounting Bolt Torque (m10)
58 Nm
Mounting Bolts
4x M10 x 60 (ISO 4762)
Pilot Flow For Shortest Switching Time
35 l/min
Pilot Return
External (Y)
Pilot Supply
Internal (E)
Pilot Volume Per Switching (3-pos)
5.72 cm3
Porting Pattern
ISO 4401-07-07-0-05
Switching Time Adjustment
Discharge Control (S2)
1620 Old Apex Road
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