4WEH16GA7X/6EG12NDA

The 4WEH16GA7X/6EG12NDA valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth for electro-hydraulic automation tasks. It uses electro-hydraulic actuation to shift the spool with pilot flow, allowing remote electrical control over high-pressure circuits. The valve is supplied in nominal size NG16 so it can match subplates and manifolds designed for 16 mm flow paths. A maximum flow of 300 l/min permits use in medium to high volume supply lines without excessive pressure drop. The main ports p, a, and b withstand up to 280 bar, enabling operation in standard industrial power units. A pilot stage designated 4WE6E high-power type provides reliable spool movement under demanding duty cycles. The assembly mounts on an ISO 4401-07-07-0-05 interface, which standardizes port geometry for interchangeability. Installation uses four M10 × 60 screws, and a tightening torque of 58 Nm secures the body against leakage. A manual override, code N, lets technicians shift the spool during setup or power loss.

Electrical features support safe pilot control. The coil is rated for 12 V DC so low-voltage supplies can activate the pilot solenoids in mobile or battery-based systems. A DIN EN 175301-803 (K4) connector provides a sealed plug-in interface that simplifies wiring and maintenance. The valve is designed for mineral oil hydraulic fluids according to DIN 51524, ensuring compatibility with widely available pressure media. Fluid cleanliness must be maintained at ISO 4406 class 20/18/15 to protect the precision-ground spool lands from wear. Pilot pressure can reach 250 bar, giving sufficient force to shift the main stage even under full load, while port T tolerates up to 250 bar so return lines can be back-pressured if required. For spring-centered operation the pilot supply must be at least 14 bar to guarantee proper centering after actuation. These parameters allow the valve to integrate into high-performance hydraulic systems while protecting internal components and maintaining predictable switching behavior.