Patent ID: 8297300
Filing Date: 2012-10-30
Classification: E03B,E03C,Y10T

Abstract:
1. An anti-back flow vacuum breaker valve, comprising: a valve body having a generally cylindrical internal chamber having a threaded upper end and having a reduced diameter lower portion forming a horizontal valve seat, and having an inlet communicating with the chamber on the underside of the valve seat, and having an outlet communicating with the chamber on the over side of the valve seat; a spherical ball positioned within the chamber of said body having a diameter larger than the diameter of the valve seat for sealing the inlet of the valve; a cylindrical valve cap having an upper portion mating with the upper end of said valve body and having a reduced diameter lower portion with external threads for engaging the threaded upper end of the chamber of said valve body and securely attached to said valve body, and having an internal conical chamber having a central vertical journal therein, forming a journal vent with a vent seat at the lower end thereof aligned with the valve seat of the valve body; and a buoyant vent plug having an upper stem slidably engaged within the journal vent of said cap, and the vent plug engagable with the vent seat; with the vent plug for elevation by said ball for sealing the vent, and for elevation by backflow of fluid through the outlet for sealing the vent.