Bosch Rexroth S20A1.0 Check Valve

Bosch Rexroth S20A1.0 is a direct-operated check valve in the S family, designed to permit flow in one direction while preventing reverse flow in hydraulic circuits, providing backflow protection for pumps, actuators, and other components in compact, cartridge-style installations. In Rexroth literature, Type S valves are described as direct-operated check valves with a seat design, and the S20A1.0 designation is used across catalogs and distributor listings in variants such as S20A1.0/SO68 and S20A1.0/SO66. Example Rexroth part numbers associated with this model include R900390434 and R900508473, reflecting its presence in multiple product families, while retailers sometimes label it simply as a hydraulic check valve for oil applications, underscoring its intended use in preventing reverse flow. Some listings note a 1-inch hydraulic connection in certain configurations, illustrating common interface sizes, and the valve is typically sourced through Bosch Rexroth's global distribution network, ensuring compatibility with standard hydraulic lines and straightforward replacement in compatible systems.