Air admittance valve

Details Air admittance valve Air admittance valve

1985-02-05

1985-12-03

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

13753327, F16K 1502

Patent

active

045560846

ABSTRACT:
An air admittance valve, particularly for use on a stack pipe of a toilet or drainage system, to close the pipe when there is at least atmospheric pressure in the pipe, but to open to admit atmospheric air to the pipe upon the occurrence of even a very small less-than-atmospheric pressure in the stack pipe. The valve has a hollow body (1,2) with a lower opening to the stack pipe, and an internal wall defining a chamber and a valve seat about an upward opening, and a lateral opening to the exterior. A valve member (3) in the body above the chamber opens and closes the upward opening, and the valve member is guided in alignment with the valve seat.

REFERENCES:
patent: 1628069 (1927-05-01), Schmidt
patent: 1819827 (1931-08-01), Thwaits
patent: 2302284 (1942-11-01), Abbott
patent: 2928413 (1960-03-01), Hansen
patent: 3605132 (1971-09-01), Lineback
patent: 4091837 (1978-05-01), Edmunds
patent: 4398557 (1983-08-01), Dugge

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