Air admittance valve for resisting high internal pressure

Details Air admittance valve for resisting high internal pressure Air admittance valve for resisting high internal pressure

1993-04-20

1993-12-28

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

13751615, 13753327, F16K 1508

Patent

active

052730689

ABSTRACT:
An air admittance valve device is disclosed for enabling valve sealing member to remain securely closed against high pressure in a pipe or duct produced from: equipment connected to said pipe or duct e.g. a hydraulic pipeline flusher device; fluid movement within, or as otherwise introduced to system of pipe or duct while further remaining tightly closed at normal atmospheric pressure (equilibrium) and equalizing pressure excursions that are below atmospheric pressure occurring within sanitary drainage pipes or room ventilation ducts by admitting air to said pipe or duct.

REFERENCES:
patent: 2928413 (1960-03-01), Hansen
patent: 3923081 (1975-12-01), Persson
patent: 4232706 (1980-11-01), Ericson
patent: 4436107 (1984-03-01), Persson
patent: 4535807 (1985-08-01), Ericson
patent: 4643221 (1987-02-01), Parker
patent: 5048562 (1991-09-01), Frawley

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