ZSF50F1-1-1X/M/12

The ZSF50F1-1-1X/M/12 prefill valve belongs to the ZSF Prefill Valves series from Bosch Rexroth and is intended to admit or release oil to large hydraulic cylinders during rapid motions. Its nominal size of 50 establishes the orifice area needed for high displacement flow in press and die-cushion circuits. A flange connection built to the UNF/UN geometry defined by ANSI/ASME B1.1 lets the body bolt directly to matching port blocks without adapters. Because the installation position can be any orientation, system designers may place the unit where pipe runs are shortest. Continuous duty at up to 350 bar operating pressure suits high-pressure pump systems, while the control port withstands 150 bar so pilot lines can actuate the poppet safely. Port A is limited to 16 bar to protect return plumbing. An NBR seal set resists standard mineral oils, and the assembled component weighs 5.5 kg for manageable handling during service.

The valve accepts HL, HLP, HLPD, HVLP, HVLPD, or HFC fluids so users can match the medium to temperature or fire-resistance requirements. To maintain reliable poppet seating, the hydraulic medium must meet a cleanliness class of 20/18/15, which restricts particle load and extends service life. A separate directional valve cannot be mounted on this model because a directional valve set-up is not possible, so actuation relies solely on the pilot port. Eight mounting screws sized M16 × 110 clamp the flange evenly, and each screw requires 240 Nm of tightening torque to achieve the specified preload. These fastening details secure the housing against pressure shocks during rapid cylinder filling and emptying, completing the mechanical framework needed to integrate the ZSF50F1-1-1X/M/12 into high-performance hydraulic automation systems.