What is Positive Displacement Pump?

positive displacement pump

A positive displacement pump (PD), often known as a pump, is one that provides an approximately consistent flow at a speed. 

The pump has a cyclic pumping action that is driven by screws, pistons, rollers, gears, diaphragms, and vanes.

The operation of a positive displacement pump is based on the idea that the liquid that is circulating through the pump can be collected within a cavity and then expelled in an amount that has been previously calculated. 

Power House presents a detailed guide on positive displacement pumps, from the fundamentals of how they work and the properties they possess.

To the variety of different types of positive displacement pumps and the key benefits they offer, this article covers it all. 

First things first, let’s go over what exactly a PD pump is.

What is it?

There are a few components, such as the piston, the diaphragm, and the plunger, that could potentially induce liquid dislocation. 

The cavities of the pumps are different on the suction and discharge sides; on the suction side, they expand, and on the discharge side, they shrink. 

Because the fluid might be drawn in on the outlet side as the hole grows, and then it might be released when the cavity contracts.

Some positive displacement pumps have a cavity that decreases as it moves from the suction side to the discharge side.

While others have a cavity that expands as it moves from the suction side to the discharge side. 

When the cavity on the suction side of the pump expands, liquid is drawn into the pump; when the cavity contracts, liquid is drawn out of the pump through the outlet.

Types of positive displacement pump:

  • Progressive Cavity Pump. 

It has a rotor rotating within a housing called a stator, the rotor is always metallic and the stator is made up of a rubber type of material. 

  • Gear pumps.

They are available in 2 configurations;

  • Vane Pump (Impeller Pump).

Has moderate capacity, low pressure, moderate solids handling capability, one seal and a constant flow.

  • Rotary Lobe Pump. 

It has moderate to high capacity, low to moderate pressure, good solids handling capability, two/four seals, a constant flow and moderate pulsation.

  • Screw Pump.

The screw pump has multi versions known as multi screw pumps featuring moderate to high capacity, high pressures, only lubricative liquids, no solids handling capability, one seal and a constant flow.

  • Diaphragm Pump.

Air Operated Diaphragm Pump has low to moderate capacity, low to moderate pressure, very low efficiencies, no seal and high pulsation.

  • Peristaltic Pump (Hose pump).

It has moderate capacity, low pressure, good solids handling capability, low shear, no seal and high pulsation.

Advantages of positive displacement pump:

Positive displacement pumps are used in a wide variety of fields because of the accuracy, dependability, and versatility of these pumps. 

It should come as no surprise that industries as diverse as food and beverage, chemical processing, and pharmaceuticals all use positive displacement pumps in their respective manufacturing processes. 

These pumps are able to handle a wide range of liquids, each of which has its own specific viscosity. Positive displacement pumps make it possible to achieve the utmost accuracy and consistency in dosing mechanisms, which are requirements for the aforementioned industries. 

These pumps also come in dependable packages.

The operation of a positive displacement pump involves the segregation and enclosing of a predetermined quantity of liquid volume. 

This volume of liquid is then mechanically moved and pumped via an outlet valve. 

Because of the way in which they are constructed to carry out their duties, positive displacement pumps are ideally suited for use in sectors of the economy.

That place a premium on accurate dosage, such as the pharmaceutical, food and beverage, and chemical processing sectors.

Why choosing Power House?

A comprehensive introduction to positive displacement pumps is provided by Power House. 

Since 1993, Power House has been a leading Egyptian company that has been operating as an Integrated Service Provider in the fields of Power Generation which makes them the most trusted source regarding getting your positive displacement pump safely.

Our competitors are unable to compete with us because of our more than three decades of experience in the Egyptian and Middle East African markets, as well as our focus on providing our customers with the greatest possible cost savings, the shortest possible lead times, and the highest quality integrated solutions.

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