Digitally controllable flow rate valve

Details Digitally controllable flow rate valve Digitally controllable flow rate valve

1997-09-18

1999-03-30

Lee, Kevin

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 3002, 251 615, F16K 31128

Patent

active

058878475

ABSTRACT:
A digitally controllable valve has a main valve member mounted on a diaphragm for movement sealing and exposing a main valve seat. A flow restriction on the main valve member varies the flow rate as a function of displacement of the main valve member from the main valve seat. Pressure in a reservoir above the diaphragm is controlled by two pilot valves respectively connected to the inlet and outlet ports of the main valve, one of which has fluid passageway with a larger minimum cross sectional area than the other. Both pilots communicate with the reservoir through a single common bleed opening which has an area less than the minimum cross sectional areas of pilot valve flow passageways.

REFERENCES:
patent: 2323839 (1943-07-01), Nixon
patent: 3211415 (1965-10-01), Rudelick
patent: 4816083 (1989-03-01), Bangyan
patent: 5042775 (1991-08-01), Willemsen
patent: 5379794 (1995-01-01), Brown

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