Z1S6P05-4X/M

The Z1S6P05-4X/M check valve belongs to the Z1S Check Valves series and is produced by Bosch Rexroth for hydraulic automation circuits. It permits unidirectional flow within stacked subplate assemblies to prevent backflow in pressure lines. This sandwich plate check valve uses a straight-through design and installs on an ISO 4401-03-02-0-05 interface, matching the NFPA T3.5.1 R2-2002 D03 pattern used in many D03 manifolds. The flow path is dedicated to channel P, guiding oil from port P2 to port P1 while blocking reverse movement. The poppet opens at a cracking pressure of 0.5 bar, so only minimal upstream pressure is needed to initiate flow. The unit tolerates operating pressures up to 350 bar and supports a maximum flow rate of 40 l/min.

Bosch Rexroth assigns a fluid cleanliness requirement of ISO 4406 20/18/15 to the Z1S6P05-4X/M, limiting particulate contamination that could affect sealing edges. The poppet is molded from high-performance plastic, a material choice that lowers inertia and improves wear resistance during rapid cycling. Because the valve functions correctly in any installation position, designers can orient the stack as needed without affecting performance. The modular Z1S program helps reduce plumbing by allowing valves like this model to be sandwiched directly between manifold sections, shortening assembly time and leak points. These attributes provide a compact solution for controlling pressure direction in mobile and industrial equipment where space and reliability are critical.