Abstract: A pump comprising a housing having a head carrying area, a motor disposed within the housing, a rotor rotated by the motor; and a pump head assembly mounted to the head mount of the housing, the pump head assembly being one of a piston head assembly or a diaphragm head assembly. The head carrying area is configured such that the piston head assembly and the diaphragm head assembly may be interchangeably mountable thereon. The head carrying area comprises a cylinder seat surrounding an aperture and a radially outward of the aperture. The sidewall may also have a step. The cylinder seat may be sized to receive a cylinder of the piston head assembly and the annular step of the annular sidewall may be configured to receive a diaphragm support ring of the diaphragm head assembly.

Abstract: A compressor or vacuum pump fluid intake manifold has fluid intake and a pair of ports provided by male and female fittings that are slidably engaged to one another. The male fitting has a portion which forms a hollow plug which fits within a respective fluid intake of the compressor housing. The plug portion, or plug, is integrally molded with a longitudinal section of the male fitting member. In similar fashion, the female fitting includes a plug portion which interfaces with a fluid intake in the compressor housing. The plug portion is integrally molded with a longitudinal portion of the female fitting. In one embodiment, each of the plugs includes three extending flanges forming an integral portion of the plug. Two of the three flanges provide a contact pressure seal with portions of the compressor housing that define the fluid intakes which receive the plugs. The other flange serves to prevent the plugs from slipping out of the fluid intakes during normal use of the fluid intake manifold.

Abstract: A two-stage membrane pump having a first pump head and a second pump head is provided. The pump heads are typically crank operated with a camshaft set up such that one pump head is in exhaust mode and the other in inlet mode, and vice-versa, during operation. The membrane and the inlet and outlet valves of the pump heads are designed to work together, along with each pump head working synchronously such that the inlet of the second pump head and exhaust of the first pump head are sealed by the actions of the two membranes. As a result an inlet valve in the second pump head is not needed. The costs of such a pump are thereby reduced while increasing the reliability of the two-stage pump.