The Rexroth SL 20 PB3-4X/ is a high-performance, pilot-operated check valve designed for reliable, leak-free blocking of one or two actuator ports, even during extended periods of inactivity. As a sandwich plate valve, it is engineered for vertical stacking assemblies, allowing for compact and efficient hydraulic system designs. This valve is ideal for applications requiring load-holding, preventing actuators from drifting or dropping under load. The pilot-to-open function provides controlled release of the blocked flow, ensuring smooth and safe operation. Manufactured by Bosch Rexroth, this component guarantees quality and durability for demanding industrial hydraulic systems.