Valve arrangement

Details Valve arrangement Valve arrangement

1992-03-30

1993-07-27

Wilson, John J.

Dentistry

Apparatus

Having suction orifice

604118, A61C 1706

Patent

active

052306259

ABSTRACT:
A valve arrangement for controlling a suction stream in a dental suction system, wherein the valve controlling the flow contains a closure element that defines a valve space on one side and a control space on the opposite side. The closure element, such as a membrane, is urged closed when the pressure in the control space is greater than the pressure in the valve space and the movement of the closure element is obtained by actuation of various control valves which control flow in effective lines extending to the control space, which lines have different effective cross sections so as to control the amount of movement of the closure element toward the closed position.

REFERENCES:
patent: 3657819 (1972-04-01), Soderqvist
patent: 3763862 (1973-10-01), Spieth
patent: 3971375 (1976-07-01), Hill
patent: 4274411 (1981-06-01), Dotson, Jr.
patent: 4706687 (1987-11-01), Rogers
patent: 5002486 (1991-03-01), Cattani

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