SV20GA1-4X/

The SV20GA1-4X/ valve belongs to the Hy-Check Valves series from Bosch Rexroth and serves to block or release flow paths in automated hydraulic circuits. It fits nominal size NG20 systems so it matches manifolds designed for that cavity, and a threaded connection with G port geometry allows direct mounting into pipework. The valve withstands a maximum operating pressure of 315 bar, letting it operate in high-pressure transmissions common in industrial presses and mobile equipment. A cracking pressure of 2.5 bar, defined as code 1, ensures the poppet lifts only after a small pressure differential to prevent unintended backflow at rest. Flow moves freely from port A to B, while the reverse path B to A opens only when a pilot signal is present, giving directional control for actuators. A pre-opening feature identified as code A reduces pressure surges by admitting a limited flow before the main poppet opens fully. The control area A3 measures 10.17 cm² so pilot pressure multiplies over this surface to shift the poppet with predictable force. Any installation position is permitted, simplifying routing within compact power units.

Reliable actuation begins once a pilot line delivers at least 5 bar, which is the minimum pilot pressure required to overcome spring force and open the valve against system pressure. Pilot oil returns internally, noted by the SV designation, so external drain lines are unnecessary. The pilot chamber holds 10.8 cm³, a volume that determines the response time when the pilot pressure changes. Fluid cleanliness should not exceed ISO 4406 class 20/18/15 to avoid wear on sealing edges and maintain tight shut-off. Functional safety is supported by an MTTFd of 150 years, indicating low probability of dangerous failure during the expected life of the installation. A threaded body weight of 5.4 kg aids stable mounting without additional brackets. These parameters together define a check valve that fits into hydraulic automation systems where compact size, predictable pilot control, and high-pressure capability are essential.