Patent ID: 7377758
Filing Date: 2008-05-27
Classification: A47K

Abstract:
1. A pump comprising pressure means ( 3 ) in communication with a valve chamber ( 4 ) provided with a first valve seat ( 5 ) and a second valve seat ( 6 ); a resilient valve element ( 7 ) including a first tapered portion ( 8 ), a second tapered portion ( 9 ) and a flange portion ( 10 ) extending radially outwardly from a periphery of the first tapered portion ( 8 ); the flange portion ( 10 ) cooperates with the first valve seat ( 15 ) to form an inlet valve; the second tapered portion ( 9 ) co-operates with the second valve seat ( 6 ) to form an outlet valve; and negative pressure applied to the flange portion ( 10 ) by the pressure means ( 3 ) in use lifts the flange portion ( 10 ) from the first valve seat ( 5 ), and positive pressure applied to the first tapered portion ( 8 ) by the pressure means ( 3 ) in use lifts the second tapered portion ( 9 ) from the second valve seat ( 6 ).