Bosch Rexroth | 4WEH16Q7X6EW110N9K4
4WEH16Q7X/6EW110N9K4
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The 4WEH16Q7X/6EW110N9K4 valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation systems. As a size NG16 unit, it routes pressure fluid between ports P, A, B, and T to control actuators. The interface conforms to the ISO 4401-07-07-0-05 pattern, allowing direct mounting on standard subplates. A Q spool permits a maximum flow of 300 l/min, while ports P, A, and B tolerate operating pressures up to 280 bar; the tank port is limited to 250 bar. Pilot control is handled by a 4WE6J.. valve with two solenoids, fed by an external X supply line and returned through the external Y line. The pilot stage accepts pressures up to 250 bar and requires at least 14 bar to shift the main spool against the centering springs. In neutral, an orifice area of 32 mm² between A-T and B-T provides restricted free flow to relieve residual pressure.
Electrical termination is made through a DIN EN 175301-803 K4 connector, and a concealed manual override coded N9 enables local actuation during commissioning or power loss. Fluid cleanliness must meet ISO 4406 (c) 20/18/15 to protect the precision-lapped spool and reduce wear. The housing is secured to the manifold with four M10 × 60 screws to ISO 4762 strength class 10.9, which are tightened to 58 Nm with a tolerance of ±10 percent to ensure uniform clamping. These screws also keep the sealing surfaces compressed under full pressure load. Proper installation is aided by the same mounting geometry across the series, so maintenance crews can swap units without pipe changes.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (ng16, Q Spool)
300 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Operating Pressure (t)
250 bar
Maximum Pilot Pressure
250 bar
Minimum Pilot Pressure (spring-centered)
14 bar
Mounting Screws
4x M10x60 ISO 4762 (10.9)
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Valve Type
4WE6J.. (2 Solenoids)
Porting Pattern
ISO 4401-07-07-0-05
Screw Tightening Torque
58 Nm +/-10%
Valve Size
NG16
Zero-position Free Flow (q)
A–T/B–T 32 mm2
1620 Old Apex Road
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