Anti-syphon flow control valve

Details Anti-syphon flow control valve Anti-syphon flow control valve

1982-09-29

1985-04-02

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137217, 1375124, 251 46, F16K 2402, F16K 31385

Patent

active

045081360

ABSTRACT:
A liquid flow control valve having a valve seat and a valve plug for engaging said valve seat, said plug being connected to a pressure responsive device, such as a diaphragm, for movement therewith, said control valve being opened and closed by forces acting on opposite sides of said diaphragm, an anti-syphon valve located below said diaphragm for directing air into said flow control valve when a suction occurs at the inlet to said valve seat; said anti-syphon valve comprising an annular array of flaps which control the flow of air through openings in the body of said liquid flow control valve. Said flaps can be arranged to also provide a barrier to reverse flow from the liquid flow control valve exit through said valve seat to its inlet. Said liquid flow control valve can be of the pilot valve operated type or manually operated.

REFERENCES:
patent: 2270838 (1942-01-01), Langdon
patent: 3005616 (1961-10-01), Seele
patent: 3120855 (1964-02-01), Fischer
patent: 3376884 (1968-04-01), Bucknell et al.
patent: 3727630 (1973-04-01), McInnis
patent: 4125124 (1978-11-01), Kah
patent: 4135696 (1979-01-01), Saarem et al.
patent: 4180236 (1979-12-01), Saarem et al.

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