Positive Displacement Pumps

Positive Displacement Pumps

Positive Displacement Pumps

Positive displacement pumps, unlike centrifugal pumps, will displace the same flow at a given speed (RPM) no matter what the discharge pressure. Thus, positive displacement pumps can be considered “constant flow machines". A positive displacement pump operating against a closed discharge valve will continue to produce flow and the pressure in the discharge line will increase, until the line bursts or the pump is severely damaged, or both. A relief or safety valve on the discharge side of the positive displacement pump is therefore necessary. The relief valve can be internal or external. The internal valve, if supplied, should in general only be used as a safety precaution, an external relief valve installed in the discharge line with a return line back to the suction line or supply tank is recommended.

Hand Pumps

Hand Pumps: Agricultural chemicals and petroleum piston hand transfer drum and barrel pumps, Chemical And Oil Plastic and Cast Iron Rotary Drum Pumps; Diaphragm Hand Primers

Flojet Pumps

Flojet Pumps AC or DC products including bottled water dispensers, agricultural pumps, automatic diaphragm demand pumps, pressure boosters, spot sprayer pumps , and variable speed constant pressure systems.

Gear Pumps

A gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common types of pumps for pumping oil. Gear pumps are also widely used in chemical installations to pump fluid with greater than viscosity. There are two main variations; external gear pumps which use two external spur or helical gears, and internal gear pumps which use an external and an internal spur gear. The Oberdorfer Pumps are of the external helical gear design. Gear pumps are positive displacement, meaning they pump a constant amount of fluid for each revolution.

Peripheral Turbine

The Pedrollo peripheral turbine pumps are recommended for pumping clean water without abrasive particles and liquids that are chemically non aggressive to the materials from which the pump is made. They are suitable for boiler feed applications, domestic use, industrial applications and as boosters for irrigating gardens.

Rubber Impeller Pumps

Flexible rubber water pumps are self priming and will lift up to 20 feet when wet. Their positive-displacement pumping action prevents air-lock. They easily pass liquid, foam and air without difficulty (cannot run dry for over 30 seconds without damage. Its gentle pumping action easily handles shear sensitive liquids without emulsifying or foaming. Flexible impeller pumps can pass soft solids and will leave them undamaged when the pump is properly sized. They can also pass hard solids with minimum wear. The simple design of the flexible impeller pumps utilizes only three moving parts (impeller, seal, and shaft). A novice can even replace impellers in 15 minutes or less keeping downtime is to a minimum. It has compact dimensions compared to competitive pump designs

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