4WEH16J7X/6EW110N9EDK25L/B10

The 4WEH16J7X/6EW110N9EDK25L/B10 directional spool valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for hydraulic automation tasks that require precise flow routing between pump, actuator, and tank lines. Its four-way spool format allows two actuator ports to be alternately pressurized or relieved, while the nominal size 16 passage geometry supports circuit layouts that follow the ISO 4401-07-07-0-05 porting pattern. A maximum flow capacity of 300 L/min lets the valve handle medium to high volume circuits without excessive pressure drop, and the built-in 1.0 mm throttle insert provides initial flow restriction that stabilizes pilot control signals. The valve withstands operating pressures up to 280 bar at ports P, A, and B, yet needs only 14 bar of pilot pressure to shift the spring-centered spool, which improves response on low-pressure control lines. Pilot supply may rise to 250 bar and return lines up to 160 bar, giving ample margin for closed-center or accumulator-loaded systems. A concealed manual override is included so maintenance staff can shift the spool during commissioning or power loss without exposing moving parts.

Permissible hydraulic media must meet ISO 4406 cleanliness class 20/18/15 so particulate contamination does not impede spool movement or score the precision-ground lands. Acceptable viscosities range from 2.8 mm²/s to 500 mm²/s, a span wide enough to cover low-temperature start-up oils and high-temperature anti-wear grades while still maintaining predictable pilot flow. Service temperatures may fall to –20 °C for cold-weather machinery and climb to 80 °C during continuous duty; these boundaries align with the elastomer seals used in the housing. Consistently operating inside the stated fluid window preserves response time and prevents cavitation at the pilot passages. With both solenoids installed the valve weighs 8.9 kg, providing sufficient mass to resist vibration yet remaining manageable for one-person handling during maintenance. The cast body’s mass also acts as a thermal sink that moderates fluid temperature spikes when the valve operates near maximum duty cycle, and the standardized mounting footprint simplifies replacement tasks in modular manifolds.