Rexroth is a drive & control company offering drive and control technologies, both specialised and integrated. Rexroth is a wholly-owned subsidiary of robert bosch gmbh. Mobile controls are control and safety systems for drive and working hydraulics of mobile equipment. Proportional pressure relief valves type kb.S are modular valves consisting of the kbps pilot stage which can be combined with a variety of main stages to achieve different pressure relief and reducing functions.