DIAPHRAGM PUMPS

A diaphragm pump comprises a two part casing formed of a front cover (10) and a back cover (12). A diaphragm plate (14) having a plurality of circular regions (16) extends across the covers (10, 12) with axially aligned inlet and outlet ports (18) leading to inlet and outlet chambers (22, 24), a valve housing (26) with a concave resilient disk outlet valve (30) and a plurality of inlet disk valves (36). A wobble plate (40) is positioned in the back cover (12) with a central boss (42) for connection to the electric motor (76). The wobble plate (40) provides a pumping action by a nutating movement which displaces the pistons (44). The circular diaphragm sections have lugs (46) of cruciform shape which are secured to corresponding slots (48) in the pistons (44). The motor casing has a mounting bracket (56) with mounting feet (58) of ovoid shape and resilient material and an integrated pressure switch for stopping the pump by activation of a micro-switch.