A pump of this invention includes an upper drive section connecting with a lower pumping section. These sections are spaced apart by a diaphragm so as to maintain the integrity of each section. Hydraulic control valvesA housing of the drive section carries a rotary drive shaft formed with a camming surface. This camming surface engages a further camming surface formed on an end of a reciprocating member supported on a spring in the housing. The reciprocating member is provided with slides to maintain the alignment of the reciprocating member.

The pumping section includes a cylinder formed with an overflow chamber which connects with a piston chamber.Water Pump Control Valves An opposite end of the reciprocating member extends through the diaphragm into the overflow chamber and has a piston disposed in the piston chamber.

As the drive shaft rotates, the camming surfaces engage to reciprocate the piston with the aid of the spring. Valving devices connecting with the piston chamber allow fluid to be selectively drawn into the chamber and be ejected therefrom under pressure.

The pump of this invention has several advantages over known pumping devices.

First this pump provides a pumping section discrete from its drive section. Such sectional integrity is particularly important when the fluid being pumped must be maintained contamination free, for example, in food processing, pharmaceuticals, and finishing systems. Since the drive section preferably is lubricated, such lubricant must be kept separate if contamination of the fluid is to be prevented and likewise contamination of this lubricant by the fluid is to be prevented.

Second, this pump provides means for readily recovering fluid bypassing the piston which is inherent when pumping pressure is excessive. This bypass fluid may be readily returned to the system contamination free.

A third advantage provided by this pump is that the piston remains properly aligned within the cylinder piston chamber.API CAST STEEL VALVES This alignment is insured in part by a close lubricated fit of an upper end of the reciprocating member with the housing and the slides carried by the reciprocating member which resist rotational movement of the reciprocating member. If the piston becomes misaligned in the piston chamber, wear between such occurs which will cause the pump to fail.

Thus, the pump is highly reliable, yet quite simple having only several moving parts. Additionally, the pump is compact, allowing a user flexibility in selecting where and how to install the pump.

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2011-12-26

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