FESE25CA-3X/315LK0B1V-1

The FESE25CA-3X/315LK0B1V-1 throttle valve is part of the FES Throttle Valves series from Bosch Rexroth and regulates flow in hydraulic automation circuits. With a size 25 construction, it matches cavity dimensions commonly used in medium-flow manifolds. The valve mounts through a DIN ISO 7368 interface, so users can drop it into standardized cartridge blocks without extra machining. Installation orientation is optional, enabling designers to place the cartridge in any position when space is limited. A nominal flow of 315 L/min at a 10 bar differential lets the unit supply actuators that demand high volume while keeping pressure loss low. The main stage withstands operating pressures up to 315 bar, supporting systems that run near the upper end of typical industrial power levels. A minimum inlet pressure of 12 bar is required to open the throttling gap, which avoids unstable operation at very low supply pressure. Mineral oil HL or HLP fluids according to DIN 51524 are specified to provide the viscosity and lubricity needed for reliable spool movement. The assembled cartridge weighs 4.0 kg, allowing manual handling during maintenance.

Cleanliness demands are set at ISO 4406 20/18/15 for the main stage and ISO 4406 17/15/12 for the pilot stage to prevent silting that could shift the throttling characteristic. The pilot circuit accepts pressures up to 315 bar, so it can be tied directly to the main supply on high-pressure manifolds, yet pilot flow is limited to 5.0 L/min through port Y to minimize energy loss. A pilot oil volume of 3.9 cm³ is needed for a full 0–100 % stroke, which informs the response time when the control signal changes. The Y return port must drain to tank at zero pressure so that the pilot spool can move freely without backpressure interference. Electrical control is wired through a B1 electronics interface that matches Bosch Rexroth driver cards used in proportional applications. FKM seals are fitted to tolerate elevated temperature and resist modern fluid additives. Together these parameters let the cartridge deliver stable throttling performance in closed-loop or open-loop hydraulic regulation tasks.