4WEH16H7X/6EG24N9K4/P4.5 CSA

The 4WEH16H7X/6EG24N9K4/P4.5 CSA valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. Designed to direct oil in hydraulic automation circuits, the component uses electro-hydraulic actuation so that a small electrical signal can move a larger hydraulic load. Its 24 V DC coil energizes a 6E high-power pilot stage, delivering rapid spool movement even when system pressure is high. A hydraulic return circuit recenters the main spool after the solenoid is de-energized, removing the need for mechanical springs. The valve follows a 4-way flow layout, giving independent pressure and return paths to two actuator ports for bidirectional motion control. Size 16 geometry matches NG16 manifolds, and the ISO 4401-07-07-0-05 porting pattern lets it replace similar valves without machining changes. Subplate mounting keeps service time short because the body can be lifted off the base without disturbing pipework. Wiring is completed through a DIN EN 175301-803 (K4) connector, while a concealed N9 manual override lets maintenance staff shift the spool locally when power is absent.

The main pressure inlet and working ports tolerate up to 350 bar, allowing the unit to serve in high-pressure presses or molding machines without derating. Return flow at port T is limited to 250 bar so drain lines can be sized appropriately, and the external pilot drain at port Y is rated for 210 bar to safeguard the pilot cavity against back-pressure. A preload valve opens at 4.5 bar, ensuring pilot oil reaches the control gallery only after the circuit has established minimum operating pressure. The cleanliness requirement of 20/18/15 per ISO 4406 confines solid contamination to levels that protect the precision spool fit from scoring. Statistical data assigns the assembly a mean time to dangerous failure of 100 years, supporting its use in safety-related installations that demand low downtime. Together these limits and durability figures define how the valve interfaces with filtration, pressure relief, and monitoring equipment so that the automation system can function predictably under continuous duty.