Bosch Rexroth R901086037 Sandwich Plate Check Valve

The Bosch Rexroth R901086037 Z1S6F05-40 sandwich plate check valve is a direct-operated hydraulic check valve designed for installation in sandwich-plate manifolds to prevent reverse flow at selected ports. It belongs to the Z1S series (size 6) within the 40-series family, a configuration that preserves installation and mounting dimensions across the 40–49 range for seamless interchangeability in compatible Rexroth plate assemblies. The part carries material number R901086037 and is described as Z1S6F05-40, aligning with its model designation. In operation, this valve blocks oil flow at the chosen ports and allows forward flow when the system pressure differential permits, delivering backflow protection in hydraulic circuits. Its sandwich-plate design enables mounting directly between standard hydraulic plates, offering a compact, integrated solution for backflow prevention in industrial hydraulic manifolds. Backflow protection helps safeguard hydraulic pumps and actuators from reverse flow and pressure fluctuations during system operation.