Control valve for a variable displacement pump

Details Control valve for a variable displacement pump Control valve for a variable displacement pump

1985-09-30

1987-10-13

Croyle, Carlton R.

Pumps

Condition responsive control of drive transmission or pump...

Having condition responsive pumped fluid control

417218, F04B 4900

Patent

active

046995714

ABSTRACT:
In the pressure regulation of a variable displacement pump very high pressures can build up in the pump delivery line if at the consumer no discharge of the fluid takes place, for example the piston of a servo motor moves against a stop. A pressure regulation of the pump is then only possible via the inner losses of the pump. Consequently, although the pressure can be built up rapidly it can only be reduced very slowly. According to the invention the pressure reduction is via a bypass which is controlled by the control valve of the variable displacement pump and which connects the pressure side of the pump to a tank discharge when the control valve is driven in the sense of a reduction of the pump pressure. According to the invention a very rapid pressure reduction is obtained so that the variable displacement pump can again be pressure controlled.

REFERENCES:
patent: 3720483 (1973-03-01), Hayner et al.
patent: 3768928 (1973-10-01), Miller et al.
patent: 3820920 (1974-06-01), Klimaszewski et al.
patent: 3969038 (1976-07-01), Nonnenmacher et al.
patent: 4142841 (1979-03-01), Claar et al.
patent: 4432703 (1984-02-01), Beutler et al.
patent: 4468173 (1984-08-01), Dantlgraber
patent: 4527958 (1985-07-01), Borman
Rexroth Publication: Title page and pp. 18, 66, 70-72, final page.

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