4WEH10J4X/6EW110N9DAL

The 4WEH10J4X/6EW110N9DAL directional spool valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth. It is used to route pressurized fluid in hydraulic automation where electro-hydraulic actuation moves the spool according to control signals. The valve has a 4-way flow path that establishes predictable connections between ports for cylinder or motor circuits, and its NG10 size balances flow capacity with a compact footprint. Spool type J allows a maximum flow of 160 l/min, letting the unit handle medium-to-high throughput demands without excessive pressure loss. Work ports P, A, and B withstand operating pressures up to 280 bar, while an external pilot oil supply through port X separates control pressure from the main line. Pilot oil is returned externally through port Y so tank back pressure does not influence spool position. The pilot section accepts pressures up to 250 bar but requires at least 12 bar to shift a spring-centered, three-position version reliably. Acceptable fluid viscosity ranges from 2.8 to 500 mm²/s, giving designers flexibility in selecting hydraulic media.

Secondary circuits linked to port D3 are limited to 45 bar, protecting auxiliary components from overload. To maintain consistent performance, the hydraulic medium must meet ISO 4406 (c) 20/18/15 cleanliness, which calls for filtration that removes damaging particulates. NBR sealing permits operation with fluid temperatures between −20 °C and +80 °C, so the valve suits mobile and stationary systems exposed to moderate climates. Installation follows the ISO 4401-05-05-0-05 mounting pattern, ensuring interchangeability with standard subplates. Fastening is completed with four M6 × 45 socket head screws per ISO 4762, and each screw is tightened to 12.5 Nm to secure the body without distorting the sealing surfaces. These mounting details, along with the electro-hydraulic actuation and external pilot configuration, allow the valve to integrate into machinery that requires dependable directional control under variable load and temperature conditions.