Positive Displacement Pumps

Positive displacement pumps are special pumps that transport liquids or gases by displacement. In contrast to other types of pumps, such as centrifugal pumps, their mode of operation is based on the principle of displacing volume elements. Plunger pumps are not turbomachines.

The main function of a positive displacement pump is to contain a certain amount of the fluid to be pumped in a chamber and to move it from an inlet to an outlet by mechanical movement (e.g. turning or pushing). This process is achieved by various mechanisms, such as pistons, diaphragms, screws or gears. These mechanisms periodically increase the volume in the chamber (to draw in the medium) and then reduce it (to displace it). If the displacement is done by a plunger, the pumps are also called plunger pumps. Plunger pumps are oscillating positive displacement pumps.

1. Suction phase: The displacer (e.g. a piston or plunger) in the pump retracts, enlarging the working chamber and allowing fluid to flow in through the suction valve. The discharge valve prevents the fluid from flowing back from the discharge line into the working chamber.
2. Displacement phase: The displacer moves forward, reducing the volume of the working chamber and increasing the pressure inside. The pressure valve opens and the fluid can flow into the pressure line, while the suction valve prevents the fluid from flowing back into the suction line. 
3. The working chamber is then back in the suction phase.

Due to their efficiency and precision, positive displacement pumps are indispensable in a variety of industries. Some of the most common applications include

• Industrial cleaning
• Mining
• Shipyards (as part of industrial cleaning)
• Construction (concrete cleaning)
• chemical industry
• Aquaculture (as part of industrial cleaning)
• Oil and gas industry
• Process technology (= chemistry)

Positive displacement and centrifugal pumps: What are the differences? (h2)

Positive displacement pumps and centrifugal pumps, also known as centrifugal pumps, are two basic types of pumps that differ significantly in their mode of operation and areas of application. The following table provides an overview of the main differences between these two pump types:

Positive displacement pumps are a class of pumps that pump liquids by periodically enlarging and reducing a working chamber. They are available as 

• oscillating pumps (e.g. piston or diaphragm pumps)
• rotating pumps (e.g. gear or rotary lobe pumps) 
• as well as pumps with a combination of a rotating and oscillating movement (e.g. radial piston pumps). 

A very well-known type of oscillating positive displacement pump is the plunger pump. Plunger pumps use a plunger piston (plunger) that moves back and forth in a cylinder. With plunger pumps, the seal does not move with the plunger (as with pistons), but is attached to the pump housing. The back and forth movement of the plunger, which is often made of ceramic, draws liquid into the cylinder, which is then expelled by the movement of the plunger in the direction of an outlet valve. Plunger pumps are not used for gases, as plunger pumps generally have too large dead spaces. 

Positive displacement pumps are known for their ability to move precise volumes of liquid in a variety of industries. These pumps are ideal for applications that require precise flow control.

At KAMAT, the specialist for high-pressure technology, we understand that every industry has its own challenges and requirements. That’s why we offer a wide range of positive displacement pumps suitable for a variety of applications – from the chemical and process industries to mining and construction. Discover how our positive displacement pumps can help boost your productivity and reduce operating costs while ensuring the highest safety standards.

Find out how we can revolutionize your industrial processes with tailor-made solutions and first-class service.

KAMAT positive displacement pumps are synonymous with innovation and quality, specifically designed to meet the demanding needs of industry. Here are some of the key benefits that make KAMAT high-pressure pumps a preferred choice in various industries:

• High efficiency and precision: KAMAT positive displacement pumps are known for their high flow accuracy. They enable precise control of flow and pressure, which is crucial in processes that require accurate metering. The high efficiency leads to considerable energy savings
• Robustness and durability: The pumps are known for their robust design and ability to operate reliably even in harsh conditions. They can withstand corrosive, abrasive or highly viscous media, ensuring a longer service life and lower maintenance costs.
• Flexibility in applications: KAMAT has a wide range of positive displacement pumps suitable for a wide variety of requirements. From the chemical and food industries to mining and the oil and gas industry, KAMAT offers customized solutions for diverse industrial requirements.
• Customer-specific service and support: KAMAT is characterized by outstanding customer service. From advice and customization of pumps to after-sales service and technical support worldwide, KAMAT offers comprehensive support for its customers.

This combination of performance, reliability and customer focus makes KAMAT positive displacement pumps an ideal solution for industrial companies looking for high-quality and efficient pump systems.