Importance

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Abstract

Auxiliary flow prevention mechanism for preventing leakage from the outlet of an air valve due to a seal malfunction of a primary stopper disposed in a primary conduit of a piping system. The mechanism includes an auxiliary conduit coupled downstream of the primary conduit. The mechanism further includes an auxiliary stopper housed within the auxiliary conduit. The auxiliary stopper is configured to seal an outlet of the auxiliary conduit when the primary stopper is in a sealing position but fails to prevent fluid outflow from an outlet of the primary conduit, whereby after sufficient fluid fills the air valve, the resultant increased fluid level urges the auxiliary stopper into a sealing position to seal an outlet of the auxiliary conduit, preventing fluid outflow therefrom. A visual indication of the seal malfunction is provided by a valve or pressure sensor that detects the presence of fluid in a downstream conduit section.

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First Claim