A pump particularly adapted to produce a pressurized fluid flow has an upper drive section attached to and separated from a lower pumping section by a diaphragm. The diaphragm maintains the integrity of each section to prevent contamination of the fluid, for example.Water Control valves In a housing of the drive section is a rotary drive shaft having an end formed with a camming surface. The drive shaft camming surface engages a camming surface formed on an end of a reciprocating member slideably carried in the housing on a spring. A lower end of the reciprocating member extends through the diaphragm and has a piston positioned in a piston chamber of a cylinder of the pumping section. As the drive shaft rotates, the engaging camming surfaces with the spring reciprocate the reciprocating member.FORGED STEEL VALVES Fluid flow into and from the piston chamber is selectively regulated by valving devices. During operation any fluid bypassing the piston caused, for example, when pump pressure is excessive, may collect in an overflow chamber formed in the cylinder. This bypass fluid may be ejected from the pump and returned to a reservoir. Water Power Control ValvesA flexing of the diaphragm by the reciprocating member promotes this return.

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2011-12-23

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