ZDR10DA3-5X/75Y

The ZDR10DA3-5X/75Y pressure reducing valve belongs to the ZDR Pressure Reducing Valves series and is manufactured by Bosch Rexroth for hydraulic automation that requires stable downstream pressure. It is built in nominal size 10, allowing it to fit NG10 manifolds without adapters. A sandwich plate connection format lets the valve be stacked between subplates and directional valves, saving space in compact power units. The designated reduction port is A, so pressure control is applied exclusively to that service line. A mounting interface of ISO 4401-05-04-0-05 standardizes bolt patterns and port locations for quick interchangeability. The secondary pressure can be adjusted up to 75 bar, and a lockable rotary knob with a scale lets maintenance staff set this value while preventing accidental changes. The assembly endures a maximum inlet pressure of 315 bar, enabling use on high-pressure supply manifolds without risk of distortion.

The valve passes up to 80 l/min, giving it capacity for medium-flow circuits such as clamp or feed branches. Pilot oil is tapped internally, identified by code Y, which eliminates external lines for pilot supply, while the return is routed externally through port TA to avoid back-pressure influencing the pilot stage. An integrated check valve permits reverse flow so actuators can retract without restriction. Counter pressure at port T may reach 160 bar; the design tolerates this level to suit systems with elevated tank lines. NBR seals are fitted to maintain compatibility with standard mineral hydraulic oils and to contain leakage under thermal cycling. Fluid cleanliness must be maintained at ISO 4406 20/18/15 to preserve spool accuracy and avoid silting. These elements combine to provide reliable pressure stabilization in stacked directional control assemblies.