Vacuum breaker for hose connection

Abstract

A vacuum breaker for hose connection includes an upper and a lower connecting element for connecting to a hose bibb and a hose connection, respectively, and a pressure pad. The upper connecting element internally has a waterproof gasket supported on a transverse partition to tightly contact with an end surface of the hose bibb. The lower connecting element has an internal stepped surface with a plurality of spaced air holes for communicating an inner space of the vacuum breaker with external environment. The pressure pad has a convex top with a central hole and is rested on the stepped surface. The pressure pad is deformed by water impacted to seal the air holes on the stepped surface, and restores to the convex top to open the air holes when the hose bibb is turned off, so that water remained in the water tube can be vacuum drained.

1 . A vacuum breaker for hose connection, comprising an upper connecting element for connecting to a hose bibb and hydrant, a lower connecting element coupled to a lower end of said upper connecting element for a water tube to connect thereto, and a pressure pad disposed in said lower connecting element; 
 said upper connecting element being internally provided with a transverse partition having a water outlet formed thereat, and an annular waterproof gasket supported on said partition to tightly contact with an end surface of a spout of said hose bibb;    said lower connecting element internally defining a radially inward extended stepped surface, on which a plurality of air holes are spaced to communicate an inner space of said vacuum breaker with external environment; and    said pressure pad having an upward convex top with a central hole and being rested on said stepped surface of said lower connecting element; said pressure pad being elastically deformable to seal said air holes on said stepped surface of said lower connecting element when water is supplied from said hose bibb and impacts on said convex top of said pressure pad, and automatically elastically restoring to said convex top to open said air holes when said hose bibb is turned off.    
   
   
       2 . The vacuum breaker for hose connection as claimed in  claim 1 , wherein said upper connecting element is provided at one side with a tightening device to ensure a firm and tight association of said upper connecting element with said hose bibb.