Electrically operated fluid control valve

Details Electrically operated fluid control valve Electrically operated fluid control valve

1987-12-18

1989-06-06

Rosenthal, Arnold

Fluid handling

Systems

Supply and exhaust

1375961, 137613, G05D 1600

Patent

active

048362344

ABSTRACT:
An electrically operated fluid control valve provides a controlled output pressure proportional to an electrical control signal. The valve housing has a pressure control chamber, an inlet passageway leading from an inlet port to the chamber, an outlet port connected to the chamber, and an outlet passageway leading from the chamber to an exhaust port. A supply diaphragm coupled with a supply valve at the inlet port regulates fluid pressure supplied to the chamber through the inlet passageway and another passageway communicates fluid pressure from the chamber to the supply diaphragm. An exhaust diaphragm at one end of the chamber coupled with an exhaust valve at the exhaust port regulates fluid pressure supplied to the exhaust port and the outlet passageway communicates fluid pressure between the chamber and the exhaust diaphragm. A torque motor in the housing rotates a control arm in the chamber to move an adjustable inlet control/relief valve in the inlet passageway to control the flow of fluid pressure between the inlet passageway and the control chamber or an adjustable outlet control/relief valve in the outlet passageway to control the flow of fluid pressure between the outlet passageway and the control chamber. The inlet control/relief valve and the outlet control/relief valve are moved proportional to the applied current and meter the flow of regulated pressure into the control chamber and the outlet port to provide a controlled output pressure through the outlet port and protect the diaphragms from excess differential pressure.

REFERENCES:
patent: 3242945 (1966-03-01), Nash
patent: 3994314 (1976-11-01), Hartley
patent: 4131130 (1978-12-01), Ruby
patent: 4182368 (1980-01-01), Hartley
patent: 4527590 (1985-07-01), Kolze
patent: 4535810 (1985-08-01), Duder et al.

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