Directional Spool Valve H-4WEH25HD6X/6EG24N9TK4 - Bosch Rexroth R900929440

Emergency functions require a valve to shift even when the main pump has stopped. This version is fed with external pilot oil, for example from an accumulator, and releases it internally into the tank passage.

Benefits

• External pilot oil supply, switching capability independent of pressure in the main circuit.
• Internal pilot oil return without an extra return line to tank.
• Flow up to 700 l/min in size 25, maximum operating pressure 350 bar.
• Spool symbol D with 4 ports and 2 switching positions.
• 17.02 kg weight, connection diagram ISO 4401-08-08-0-05, NBR seals.

Application

Circuits like this are found on lifting gear and presses with emergency lowering or accumulator start. The pilot stage stays pressurised in those cases although the working circuit is already unloaded. Supply voltage is 24 VDC.

Manufacturer

Bosch Rexroth, material number R900929440, type designation H-4WEH25HD6X/6EG24N9TK4. Data sheets RE 24751 and RE 07600-B carry the characteristic curves, port dimensions and installation notes.