Vent pipe check valve

Details Vent pipe check valve Vent pipe check valve

1974-10-07

1976-03-02

Cline, William R.

Fluid handling

Line condition change responsive valves

Direct response valves

1375278, 251147, 251306, 4211, F16K 1500

Patent

active

039411516

ABSTRACT:
A valve assembly clamped to the upper end of a vent pipe includes an elongated sleeve with a band clamp and sealing gasket at its inner end for ready clamping to the vent pipe. A butterfly valve plate is nonrotatably fixed to a pivot shaft in unbalanced relation, with the shaft extending through the sleeve and having a transverse operator arm. Semi-annular seat means provide a sealing seat at upper and lower surfaces of the valve plate, on respective opposite sides of the pivot axis; and a spring or weight urges the valve plate to the seated position.

REFERENCES:
patent: 215887 (1879-05-01), Crossman
patent: 813771 (1906-02-01), Bush
patent: 1337326 (1920-04-01), Rice
patent: 1993069 (1935-03-01), McConnell, Jr.
patent: 2008835 (1935-07-01), Rawcliffe
patent: 2461392 (1949-02-01), Parry
patent: 2494016 (1950-01-01), Taylor
patent: 2760517 (1956-08-01), Davis
patent: 3605132 (1971-09-01), Lineback

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