The Rexroth R900501701 SV20PB1-4X/ is a high-performance, pilot-operated check valve designed for reliable and leak-free shut-off of flow in one direction. This poppet-type valve allows free flow from port A to B while blocking flow in the opposite direction. The block can be released by applying pilot pressure to the X port, enabling reverse flow from B to A. Engineered for subplate mounting according to ISO 5781 standards, it is ideal for applications requiring secure load holding, blocking, and safety functions in demanding hydraulic systems. Its robust construction ensures durability and long service life under high pressure conditions.