| 摘要 |
An anti-back flow vacuum breaker valve that includes a valve body having a cylindrical internal chamber having an upper portion and 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 ball is positioned within the internal chamber for sealing the inlet of the valve body. A valve cap having a lower portion mating with the upper portion of the valve body sealed and securely attached to the 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 body. A buoyant vent plug having an upper stem slidably engaged within the journal vent of the cap, and the vent plug engagable with the vent seat, wherein the vent plug for elevation by the ball upon fluid flow through the inlet to seal the vent, and wherein the vent plug for elevation by backflow of fluid through the outlet to seal the vent. |
