Hotoil flush
Hotoil flush
(OP)
Can anyone explain the basic idea of using a bypass or flush/boost valve ( for the purpose of a hotoil bypass, back to tank) in a closed hydra circuit?
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RE: Hotoil flush
RE: Hotoil flush
With a constant displacement pump/distributor valve circuit, you need a bypass valve across the flow and return lines to prevent the pump deadheading. Keying this to demanded flow rather than just using a pressure relief valve massively reduces the amount of heat generated when the system is idling.
A.
RE: Hotoil flush
If the motor flushing falve is set slightly lower than the pump, there will be some cooling through motor, some remaining charge flow at pump.
Other important functions of the charge pump are to provide pressure for the servo stroker control, to provide positive force holding the pistons against the swash plate as they go past top center and back down, and to provide enough positive pressure (typically 250 to 400 psi) at the inlet side to prevent cavitation.
Check the Sauer, Rexroth, Linde, or other sites for 'how hydrostatic transmissions works' type of circuit pages.
kcj
RE: Hotoil flush
RE: Hotoil flush
Best Regards
Rajan Bedi