Diaphragm pump

Claim 1

A diaphragm pump, of the type comprising a lower body and an upper body with mating annular peripheral flanges between which the periphery of the diaphragm is gripped, and in which the lower body contains a mechanism for deforming said diaphragm in a reciprocating manner, and in which said upper body is formed with two housings which contain respectively an automatic intake valve and an automatic delivery valve through which a chamber overlying the diaphragm is put into communication with an intake pipe union and a delivery pipe union respectively, which branch from corresponding spaces overlying the respective valves, characterised in that: said upper body has a pair of separate cavities arranged side-by-side, each of which houses one of the valves and has an upper bell-shaped annular part of revolution; and associated with each cavity is a cap separate from said upper body and one another, each cap having a pipe union branching therefrom and having a skirt of revolution engaging the corresponding bell-shaped part, one forming an inlet and one forming an outlet; at least one of each bell-shaped part and the corresponding skirt being resilient; each skirt and the corresponding bell-shaped part having cooperating snap-engageable members and facing radial surfaces between which is clamped an annular sealing washer, at least one of said caps including said pipe union branching therefrom at an angle from the axis of said cap and said cap and pipe union rotatable to different tangential positions.