SV30PB3-4X/

The SV30PB3-4X/ valve belongs to the Hy-Check Valves series from Bosch Rexroth and serves as a check element that blocks reverse flow in hydraulic circuits. Its nominal size is NG32, establishing the flow path cross-section for medium to high capacity lines. A maximum operating pressure of 315 bar allows the unit to work in high-pressure systems common in mobile and industrial equipment. The cracking pressure is set at 8.0 bar so the poppet opens only after this upstream force is reached, preventing unintended leakage at lower pressures. Flow from port A to port B is unrestricted, while reverse flow from B to A occurs only when the pilot stage opens, which defines the stated direction of flow. Because there is no pre-opening feature, the valve remains fully closed until the pilot signal meets the cracking threshold, ensuring positive shutoff. Subplate mounting simplifies replacement in standardized manifolds, and the valve can be installed in any position, giving designers flexibility in manifold orientation.

The pilot stage accepts pressures between 5 and 315 bar, letting external controls command the valve across the full working range, and the pilot oil returns internally so no additional drain line is required. Pilot chamber volume at port X is 19.27 cm³, which determines the fluid quantity needed to shift the poppet and influences response time. Interface conformity is maintained by the ISO 5781-09-13-0-16 porting pattern, allowing direct mounting to compatible subplates. The acceptable viscosity window spans 2.8 to 500 mm²/s, enabling operation with a wide variety of hydraulic fluids without performance loss. Cleanliness class ISO 4406 20/18/15 limits particle contamination to protect the sealing surfaces from wear. The valve weighs 7.8 kg, a figure relevant for handling during assembly and for manifold load calculations. An MTTFd of 150 years indicates high functional reliability over extended service life in safety-related circuits.