The Hydac ERVE20021-01-C-VS-13 is a high-performance, pilot-operated check valve designed as a screw-in cartridge. This single-acting valve allows free flow from port 1 to port 2 while blocking flow in the opposite direction. The valve can be opened to permit reverse flow by applying sufficient pressure to the pilot port (port 3). Constructed for durability and reliability, it is ideal for load-holding applications, preventing cylinder drift, and for use in accumulator safety circuits. Its robust design and FKM seals ensure excellent performance in demanding hydraulic systems with operating pressures up to 350 bar.