Patent ID: 7721359
Filing Date: 2010-05-25
Classification: E03C

Abstract:
1. A vacuum breaker comprising: a main body having a water inlet, a water outlet, a water passage for fluidically connecting said water inlet and said water outlet, and first and second ambient-air intake ports for allowing said water passage to fluidically communicate with ambient air therethrough; a first valve element disposed in said main body; and a second valve element disposed in said main body at a position downstream of said first valve element, wherein: said first valve element is designed to be movable between a first position where said first valve element closes said first ambient-air intake port and opens said water inlet so as to allow said water inlet to fluidically communicate with a zone of said water passage between said first and second valve elements, when water is permitted to pass through said water passage, and a second position where said first valve element closes said water inlet and opens said first ambient-air intake port so as to allow said first ambient-air intake port to fluidically communicate with the zone of said water passage between said first and second valve elements, when water is inhibited from passing through said water passage; and said second valve element is designed to be movable between a first position where said second valve element closes said second ambient-air intake port and opens the zone of said water passage between said first and second valve elements so as to allow the zone of said water passage between said first and second valve elements to fluidically communicate with said water outlet, when water is permitted to pass through said water passage, and a second position where said second valve element closes the zone of said water passage between said first and second valve elements and opens said second ambient-air intake port so as to allow said second ambient-air intake port to fluidically communicate with said water outlet, when water is inhibited from passing through said water passage.