Back flow preventer and integral vacuum breaker

Details Back flow preventer and integral vacuum breaker Back flow preventer and integral vacuum breaker

1990-06-15

1991-08-13

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137512, 1375124, F16K 2400

Patent

active

050388142

ABSTRACT:
A back flow preventer and vacuum breaker for use with a plumbing fixture in which the discharge may be moved to a position within a body of water includes a body having an inlet and an outlet, a chamber connecting the inlet and outlet and an air vent opening into the chamber. There is a first diaphragm positioned within the chamber which controls air flow through the vent. There is a second diaphragm positioned in the chamber which controls flow from the inlet into the chamber and includes an integral check valve extending into the outlet.

REFERENCES:
patent: 2211212 (1940-08-01), Langdon
patent: 2322631 (1943-06-01), Groeniger
patent: 3633613 (1972-01-01), Julow
patent: 4084606 (1978-04-01), Mittleman

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