Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1984-03-22
1985-08-20
Croyle, Carlton R.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417310, 137115, 137117, F04B 4908, G05D 1100
Patent
active
045361339
ABSTRACT:
A regulatable vane pump is provided with regulating apparatus incorporated in the pump having a differential pressure piston operable responsive to booster steering flow demand wherein the piston carries a flexible leaf spring having a flat surface which serves as a shut off member against ports in a restrictor member. Actuation of the regulating piston carries the leaf spring toward the ported member to progressively shut off restrictor ports in the face of the ported member, either partially or fully depending upon the ported arrangement. As ports are gradually closed off regulation of the pump discharge is effected at various demand pressures after linear rise of rate of discharge up to a regulating point. Thereafter, there is wide separation of characteristics of regulating curves or lines for differing pressure demands. The overall effect produces a precise regulation within narrow limits as well as an economy of manufacture.
REFERENCES:
patent: 2462983 (1949-03-01), MacDuff et al.
patent: 3253607 (1966-05-01), Drutchas
patent: 3404634 (1968-10-01), Connelly
patent: 3645647 (1972-02-01), Ciampa et al.
Croyle Carlton R.
Olds Theodore W.
Zahnradfabrik Friedrichshafen AG.
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