Pilot-operated Check Valves

ERV 8, ERV 8-600:
These pilot-operated check valves are size 8, two stage, high performance screw-in cartridges with an (ERV 8: M30x1.5 / ERV 8-600: M34x1.5) mounting thread. The conical-seat design ensures that the cartridges are leak-tight from B → A. The check function can be overridden by applying a suitable pilot pressure at port X. In the A → B direction, flow can pass freely through the valve (opening pressure = 2.5 bar). These screw-in cartridges are predominantly used in certain mobile and industrial applica­tions to maintain the position of loaded actuators (e.g. out­rigger cylinders) after the pump pressure has been disconnected.

Plate-type, screw-in design
Series ERVH

Pilot-operated check valves prevent any flow in one direction. In the opposite direction, free flow with minimal pressure drop is possible. By applying a defined pilot pressure at X, the checked flow direction is held open as long as the pilot pressure is maintained.

Series REP… check valves prevent any flow in one direction but the valves can be made to open by applying pressure to port X. In the opposite direction, flow is unrestricted (opening pressure approx. 2 bar).

Series PDCV-08 pilot-operated check valves lock a cylinder in any rest position. They are intended for direct mounting in the cylinder as weel as for mounting in a manifold block or a line mounting body.