Two-range pressure control system

Details Two-range pressure control system Two-range pressure control system

1985-09-18

1987-07-14

Schwadron, Martin P.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

13762564, 13762566, 417222, F04B 4700, G05D 1600

Patent

active

046799885

ABSTRACT:
Pressure control device comprising a manual valve (VM) associated with a pressure control valve (VRP), includes a first line pressure (P.sub.L), defined by two calibrated jets in series, which are placed on a duct set at zero pressure by the manual valve (VM) being in a first position R. At a second line pressure range (P.sub.L), a duct is fed at line pressure (P.sub.L), the manual valve (VM) is in a second position A. A variation of line pressure (P.sub.L) is assured by a modulating solenoid valve (EVM), which establishes a modulated pressure (P.sub.M) acting on a differential section (.SIGMA.) of said pressure control valve (VRP).

REFERENCES:
patent: 2849889 (1958-09-01), Ball et al.
patent: 3820920 (1974-06-01), Klimaszewski et al.
patent: 4072443 (1978-02-01), Heath
patent: 4094211 (1978-06-01), Espenschied
patent: 4189921 (1980-02-01), Knapp
patent: 4279268 (1981-07-01), Aubert
patent: 4302937 (1981-12-01), Aubert
patent: 4426194 (1984-01-01), Pollman

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