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1. (WO2017184361) DUAL AIR ADMITTANCE VALVE

Pub. No.:    WO/2017/184361    International Application No.:    PCT/US2017/026641
Publication Date: Fri Oct 27 01:59:59 CEST 2017 International Filing Date: Sat Apr 08 01:59:59 CEST 2017
IPC: F16K 15/04
F16K 27/02
F16K 15/14
F16K 24/04
E03C 1/122
Applicants: AA ANTI-AIR-LOCK CORP
Inventors: DI MONTE, Michael
Title: DUAL AIR ADMITTANCE VALVE
Abstract:
An apparatus to allow or stop an air flow into an enclosed environment or piping system includes a housing having an upper flow passage, a middle flow passage, a lower flow passage; a first valve seat; a first valve diaphragm; a second valve seat; and a second valve diaphragm.