The Bosch Rexroth SL 20 PA 1-42 Hydraulic Pilot Operated Check Valve is a hydraulic valve that prevents backflow in a circuit until a pilot signal is applied, at which point it opens to allow controlled reverse flow. As part of the Rexroth SL 20 family, the PA port pilot pressure overrides the internal check to enable flow in the opposite direction. The model SL 20 PA 1-42 identifies the exact configuration for integrating piloted backflow control into hydraulic systems that require precise sequencing and hold-release operation.
