Dual air admittance valve with locking mechanism and pressure indicator
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United States of America Patent
Stats
-
Jun 13, 2023
Grant Date -
Nov 11, 2021
app pub date -
May 25, 2021
filing date -
Apr 18, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus to allow or stop an air flow into an enclosed environment or piping system comprises (a) a housing, (b) a first valve seat, (c) a first sealing member, (d) a second valve seat, (e) a second sealing member, (f) at least one locking mechanism configured to limit a movement of the first sealing member and/or the second sealing member; wherein the first sealing member moves away from the first valve seat when the second pressure is greater than the first pressure in a predetermined pressure difference; wherein the second sealing member moves away from the first valve seat when the third pressure is greater than the second pressure in a predetermined pressure difference; wherein the first pressure communicates with a system pressure in the piping system; and wherein the third pressure communicates with an ambient air pressure.
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