4WEH10D4X/OF6EW110N9ETDAL CSA

The 4WEH10D4X/OF6EW110N9ETDAL CSA directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and directs flow in hydraulic automation systems. Its NG10 size provides a flow capacity suited to medium-frame manifolds. The ISO 4401-05-05-0-05 mounting interface lets the valve bolt to standardized subplates without adapters. Installation requires four M6 × 45 screws, matching common service hardware on industrial power units. These screws must be tightened to 12.5 Nm to maintain gasket compression and prevent leakage. The unit withstands up to 280 bar on ports P, A, and B, allowing it to function in high-pressure working circuits. Both pilot oil supply and return are internal, which removes the need for external pilot lines and simplifies plumbing. Ports X and Y remain closed so back-drain connections are unnecessary in typical block designs.

An AC coil is fitted to generate the electromagnetic force for spool actuation when connected to line voltage. A pilot-stage detent holds the spool in position after energization, keeping the selected flow path open without continuous power. The concealed manual override lets technicians shift the spool during commissioning while protecting the push pin from accidental activation. HLP hydraulic fluid according to DIN 51524 is the recommended medium, ensuring compatibility with the seal materials used in the valve. The assembly is rated for a maximum pilot pressure of 250 bar so the pilot stage operates reliably even in elevated-pressure systems. Cleanliness class ISO 4406 20/18/15 is required to keep sliding components free of abrasive particles that could impair movement. A coating thickness limited to 100 µm protects external surfaces from corrosion while keeping mounting dimensions accurate. With an MTTFd of 100 years, the valve offers a statistically long service life for safety-related circuits.