4WEH22D7X/6EW110N9ETDA/B10

The 4WEH22D7X/6EW110N9ETDA/B10 valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth. Designed to direct fluid in automated hydraulic machinery, it employs electro-hydraulic actuation so an electrical signal pilots the spool by hydraulic force. The four-way port arrangement provides two working lines plus one pressure and one return path, enabling bidirectional cylinder control. A nominal size of 25 permits generous internal passages, and the valve sustains up to 450 l/min without excessive pressure loss. Operating pressure can reach 280 bar at ports P, A, and B, allowing use in high-pressure circuits. Subplate mounting shortens service time because the manifold remains fixed during valve exchange. The interface follows ISO 4401-08-08-0-05 dimensions to maintain compatibility with common base plates. Pilot oil is supplied and returned internally under the ET configuration, eliminating external lines and reducing leakage points.

Pilot control is handled by a single-solenoid 4WE6D valve that meters oil to the main stage; reliable shifting starts at a pilot pressure of 11 bar and may continue up to 210 bar without damaging components. The internal pilot return line can accommodate 160 bar when powered by AC coils, protecting the drain circuit from overloading. A concealed manual override identified as N9 lets maintenance personnel move the spool mechanically while keeping the override protected from accidental actuation. A 1.0 mm throttle insert restricts pilot flow, damping the switching speed and minimizing pressure shocks. The cleanliness requirement of ISO 4406 (c) 20/18/15 limits particle contamination to safeguard seals and sliding surfaces. Together, the pilot stage, override, contamination limit, and orifice sizing coordinate to maintain smooth directional changes and long service life within the stated pressure envelope.