SF200A1-1-4X/12

The SF200A1-1-4X/12 valve belongs to the SF Prefill Valves series from Bosch Rexroth and is applied in hydraulic automation to fill and empty large cylinders rapidly while preventing backflow. As a pilot-operated check valve, it holds the load when system pressure is removed and opens only under pilot control to ensure safe motion. A permissible operating pressure of 350 bar allows the unit to work in high-pressure presses and molding machines. The main poppet area of 216.4 cm² generates sufficient hydraulic force to seal against this pressure, while the 42 mm poppet stroke provides the travel needed for high flow rates during the prefill phase. A control spool area of 50.3 cm² establishes the pilot ratio that shifts the poppet reliably when commanded. The opening pilot volume of 171 cm³ defines the pilot oil quantity required to move the spool, which helps size the pilot circuit. Pre-decompression is present so the valve can relieve trapped pressure before full opening, and an unchecking ratio of 4.3 ensures consistent reseating when flow reverses.

The valve uses a flange connection to create a rigid interface with the cylinder manifold and minimize pressure losses. Fifteen mounting screws sized M36 × 150 secure the body, and each screw must be tightened to 2600 Nm to maintain seal integrity under repetitive pressure cycles. An installation position of any orientation gives flexibility when designing compact hydraulic blocks. Port A is restricted to 16 bar so auxiliary circuits connected to this port are protected from overpressure. The required fluid cleanliness of ISO 4406 20/18/15 limits particle contamination and extends service life of the poppet and spool surfaces. A weight of 185 kg in version A influences hoisting provisions during maintenance, and the mass also provides stability against hydraulic reaction forces. Overall, these mounting, pressure, and cleanliness parameters support reliable operation of the SF200A1-1-4X/12 valve within large-capacity hydraulic systems.