Patent ID: 6572340
Filing Date: 2003-06-03
Classification: F04F

Abstract:
A pump assembly comprising:a hollow housing (11) having a first inlet valve (12) and outlet valve (14) for a fluid to be pumped; a second inlet valve (20) for a motive fluid operative between open and closed positions and a vent valve (22) and a value actuating means for simultaneously opening and closing said second inlet valve (20) and vent valve (22) for the motive fluid: a float (24), an over center linkage mechanism (58) operatively connected to said valve actuating means comprising a pair of links (56), (58) pivotally connected to one another and to said float (24) and to said second inlet (20) and said vent (22); and positive stop means engageable by one of said over center links ensuring over center tripping action of the linkage when the float Is at opposing upper and lower limit positions.