3FREX6B-1X/35L2G24-25N12Z4MM-254

The 3FREX6B-1X/35L2G24-25N12Z4MM-254 proportional flow control valve is produced by Bosch Rexroth for the 3FRE Flow Control Valves series. It meters hydraulic fluid in automated circuits where precise flow regulation is required. With a nominal size of NG6, the valve fits compact manifolds without increasing block footprint. Subplate mounting simplifies service replacement, and the interface follows ISO 4401-03-02-0-94 to ensure interchangeability among standard ports. An NBR seal package resists common mineral oils while minimizing leakage. The electronics accept a 24 V DC supply so the device can be powered from conventional machine control panels.

The valve supports a nominal flow rate of 35 l/min when the pressure drop is 8 bar, allowing consistent actuator speed under typical system load. Its construction tolerates working pressures up to 250 bar, matching medium-pressure industrial power units. The metering spool provides a linear flow characteristic, so changes in command yield proportional flow variation for straightforward loop tuning. Command input is a +10 V normally closed signal, enabling direct interface with analog controllers that output standard reference voltages. There is no check valve integrated, so reverse flow depends solely on circuit plumbing rather than an internal bypass element.