4WEH22D7X/6EW110N9EK4/B10

The 4WEH22D7X/6EW110N9EK4/B10 directional valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth. As an electro-hydraulic unit it converts a small electrical pilot signal into hydraulic force so that the main spool can shift flow paths in automated circuits. The valve is built in nominal size NG25, a dimension that determines the flow capacity for medium-to-high flow applications. It provides two spool positions, governed by the D-pattern spool geometry, to route pressure from port P to either port A or B. Subplate mounting lets the body seat directly on a standardized base, while the ISO 4401-08-08-0-05 porting pattern aligns the pressure and tank passages without custom drilling. A DIN EN 175301-803 (K4) connector supplies the solenoid with voltage and simplifies field wiring. During operation the hydraulic channels can be loaded up to 280 bar at ports P, A, and B, allowing use in high-pressure work circuits. A 1.0 mm throttle insert is provided to meter pilot oil and damp switching impacts.

A separate pilot stage works within a maximum pressure of 210 bar and still shifts reliably when the inlet pressure reaches at least 11 bar, a figure relevant for spring-returned spool variants. System cleanliness must meet ISO 4406 (c) 20/18/15 so that contaminants do not score the precision-ground lands and lead to leakage. Particles above this limit would accelerate erosion and upset pressure balance, so filtration is mandatory. The external surfaces carry a corrosion-resistant coating up to 100 µm thick, extending service life in damp environments. Expected mean time to dangerous failure is 100 years, supporting long-term machine availability in safety-related installations. These durability measures combine with the stated pressure limits to keep the valve switching predictably over millions of cycles. Consistent pilot oil quality and surface protection therefore ensure accurate flow control throughout the product’s service life.