H-4WEH16D7X/6EW110N9SK4

The H-4WEH16D7X/6EW110N9SK4 valve belongs to the WEH Directional Spool Valves series produced by Bosch Rexroth for switching flow paths in automated hydraulic systems. Its nominal size 16 (NG16) defines passage dimensions suitable for manifold blocks that supply medium-frame actuators. The D-type, two-position spool shifts between discrete flow routes so cylinders or motors can extend and retract with clear logic. A maximum operating pressure of 350 bar at ports P, A, and B lets the valve work in high-pressure presses or injection machines. The unit accommodates a maximum flow of 300 l/min, sustaining actuator speed without excessive pressure drop. Oil with viscosities from 2.8 to 500 mm²/s can pass through the spool without loss of control, and NBR seals tolerate fluid temperatures from –20 °C to +80 °C for seasonal outdoor service. The ISO 4401-07-07-0-05 porting pattern aligns the body with common CETOP 07 subplates for straightforward installation.

External pilot oil supply at port X keeps the control circuit separate from load flow, and a maximum pilot pressure of 250 bar ensures rapid spool movement even when system pressure peaks. The valve still responds at a minimum pilot pressure of 14 bar, enabling reliable actuation in low-pressure standby conditions. Pilot return through port Y resists up to 160 bar, preventing back-pressure induced malfunction in regenerative circuits. Required cleanliness class ISO 4406 20/18/15 limits particle contamination, extending spool and seal life in continuous duty. Electrical connection by DIN EN 175301-803 plug simplifies coil replacement and aligns with standard cable harnesses. A concealed manual override permits on-site shifting during commissioning while reducing the risk of accidental activation after startup. The tank port withstands 250 bar, allowing installation in circuits where return lines experience elevated pressure without jeopardizing housing integrity.