Pump valve

Claim 1

A pump including: a variable internal volume chamber for temporary storge of a flow media therein; a first valve connected to said chamber for one-way flow of said media, therethrough, said valve comprising an elastomer valve sheet having a valve plate therein centered in arcuate cutouts through the valve sheet with cutout gaps spacing apart the valve plate from the balance of the valve sheet and with opposed flexible webs formed between cutouts connecting valve plate to valve sheet; an annular valve seat with a flow passage centrally thereof pressing against one surface of said valve plate and a circular recess with a flow passage from said chamber connected thereto facing the other surface of said valve plate, the flow passages being joined by way of the cutouts when the valve plate lifts from the annular valve seat; a groove surrounding the annular valve seat greater in diameter than the diameter of the circular recess; and housing wall means surrounding the groove and housing wall means surrounding the recess, said elastomer valve sheet being compressed therebetween whereby the valve plate is biased against the annular valve seat. a second like one-way valve connected to said chamber oriented for opposite direction flow relative to said chamber and said first valve; means to alternately increase and decrease the internal volume of said chamber; whereby expanding the volume of said chamber lifts one valve plate from its valve seat by flexure of said web, and contracting the volumne of said chamber lifts the other valve plate from its valve seat.