Complete Hydraulic Safety in One Assembly
Bosch Rexroth STO manifolds give you complete hydraulic safety—isolation, decompression, and restart protection—in one factory-tested assembly. Instead of sourcing, validating, and maintaining eight separate components, you get everything integrated and documented. It’s simpler to specify, install, and maintain while improving protection through better integration.
The STOM series delivers pre-engineered, pre-validated safety shutdowns for hydraulic systems up to Category 4 PLe, the highest safety level defined by ISO 13849. Instead of designing your own safety circuits, you select from three standardized configurations based on four simple parameters:
- Pressure (up to 315 bar)
- Flow rate (up to 1750 l/min)
- Required safety level (Cat 3 or Cat 4)
- Functions needed (STO, SDE, SLS)
Three Safety Functions. One Compact Block.
Safe Torque Off (STO): Two-channel, position-monitored blocking from P1 to P2 ensures leak-free shutdown of entire machine areas or systems.
Safe Decompression (SDE): Controlled pressure relief through dual bypass valves with flow-limiting nozzles safely drains downstream pressure in under <300ms in most applications.
Safe Limited Speed (SLS): Pre-compression through the same bypass circuit minimizes switching shocks, extends component life, and reduces noise while meeting functional safety requirements for controlled flow.