Back flow preventer valve

Details Back flow preventer valve Back flow preventer valve

1975-09-17

1977-03-22

Cohan, Alan

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

E03C 110

Patent

active

040130894

ABSTRACT:
A back flow preventer valve has an annular resilient diaphragm secured to the valve body between the inlet and outlet valves; the diaphragm supports an annular wall member which closes off a vent. In the event of back flow, the pressure on the membrane raises the annular wall from the vent to open the latter and the back flow does not cause contamination. The feature of the valve is a seal formed by the valve body and the annular wall engaging in the event of diaphragm failure, thus ensuring that the back flow travels through the vent.

REFERENCES:
patent: 3818929 (1974-06-01), Braukmann
patent: 3905382 (1975-09-01), Waterston

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