SV30PA1-4X/

The SV30PA1-4X/ check valve is provided by Bosch Rexroth within the Hy-Check Valves series. It serves as a hydraulically pilot-operated check component that blocks return flow until a pilot signal is applied, supporting load holding tasks in automated circuits. Nominal size 32 establishes the flow section for systems built around medium to large bore manifolds. The unit follows the ISO 5781-09-13-0-16 porting pattern, so it lines up with standardized subplates. Subplate mounting simplifies maintenance because the valve can be changed without breaking pipework. A→B free flow and B→A flow when opened define its direction logic for actuator control. A cracking pressure of 2.5 bar keeps the poppet seated against minor back-pressure while allowing prompt opening under command. The design includes a pre-opening feature that reduces switching shock during pilot release. Any installation position is permitted, giving layout flexibility inside power units and manifolds. The housing weighs 7.8 kg, which eases manual handling during assembly.

The valve accommodates system pressures up to 315 bar, matching both operating and pilot circuits to the same maximum rating. A minimum pilot pressure of 5 bar is enough to overcome the spring load and open the check element, while 315 bar is the allowable pilot ceiling. When fully opened it passes up to 550 l/min, enabling high-flow actuators to retract without restriction. Pilot oil returns internally, so external drain lines are not required. Port X holds 19.27 cm³ of pilot volume, which defines the response time of the poppet during control signals. The component is supplied clean to ISO 4406 class 20/18/15, reducing the risk of contamination-related wear. A calculated mean time to dangerous failure of 150 years supports high reliability objectives in safety-related circuits. This capacity ensures cylinders with large displacement volumes are not throttled during rapid movement. High reliability figures lessen scheduled maintenance frequency in continuous-duty machinery.