{"id":5756,"date":"2025-02-05T15:19:42","date_gmt":"2025-02-05T14:19:42","guid":{"rendered":"https:\/\/www.cdrpompe.com\/?p=5756"},"modified":"2025-07-14T10:42:58","modified_gmt":"2025-07-14T08:42:58","slug":"volumetric-pumps","status":"publish","type":"post","link":"https:\/\/www.cdrpompe.com\/en\/pompe-volumetriche\/","title":{"rendered":"Positive Displacement Pumps: What They Are, Their Advantages, and Applications"},"content":{"rendered":"

Positive displacement pumps are devices used to transfer liquids from one point to another<\/strong>, harnessing the principle of displacing a defined volume of fluid for each operating cycle. Generally, pumps are capable of transferring a fluid from low-pressure areas to high-pressure zones, from lower to higher locations, and from nearby to distant places.<\/p>\n

Whatever the type of pumps, therefore, We always talk about moving fluids from point A to point B.<\/strong> Unlike dynamic pumps (like centrifugal pumps), which increase fluid pressure through acceleration and subsequent deceleration, positive displacement pumps transfer fluid by changing the volume in a pumping chamber.<\/p>\n

This type of pump is useful in many industrial applications due to its ability to ensure a constant and controlled flow of liquids.\u00a0<\/strong>Key areas of use include the chemical and pharmaceutical industries, automotive, oil and fuel sectors, as well as water and industrial fluid treatment.<\/p>\n

We at CDR Pompe<\/strong><\/a> We want to talk to you about these pumps, their unique features, and their advantages in chemical, agricultural, and other fields.<\/p>\n

Positive displacement pumps vs. dynamic pumps: what's the difference?<\/h2>\n

Dynamic pumps and positive displacement pumps are the two main types of pumps used for fluid transfer. What differentiates them is their operating principle and applications.<\/p>\n

The dynamic pumps<\/strong> they work through the kinetic energy supplied to the fluid, which is then transformed into pressure. This type of pump is perfect when large quantities of fluid need to be moved with moderate pressure variations. The volumetric<\/strong>, on the other hand, act by moving a fixed amount of fluid for each working cycle (for example, each turn of a piston or each movement of a diaphragm). These pumps are ideal for applications requiring high pressures and constant flows. In addition to the ability to maintain a constant fluid volume, dynamic pumps work independently of pressure. This is very useful when a constant amount of fluid needs to be guaranteed even if the flow resistance changes.<\/p>\n

Neither pump is better than the other. The choice depends entirely on the type of application required.<\/p>\n

How does a positive displacement pump work<\/h3>\n

The operation of positive displacement pumps is based on An intake and discharge cycle<\/strong>. During suction, the fluid enters the chamber through an opening, while during the delivery phase, the chamber reduces in volume, pushing the fluid towards the outlet. <\/span>Each operating cycle corresponds to a complete rotation of the pump shaft (360\u00b0), and the pumped volume is constant and independent of the fluid pressure.<\/span><\/p>\n

Positive displacement pumps they are often used to handle viscous, corrosive, or solids-laden fluids. <\/strong>This makes them an excellent and reliable solution for many applications, including the food and beverage industry.<\/p>\n

Just like the CDR magnetic drive pumps<\/strong><\/a>, there are also some variations of volumetric ones. Rotary positive displacement pumps<\/strong> and the Positive displacement reciprocating pumps<\/strong> Both are designed to move a precise volume of fluid continuously. They are differentiated by their operating principle and mechanical configuration.<\/p>\n

Rotary and reciprocating positive displacement pumps<\/h3>\n

Rotary positive displacement pump<\/h4>\n

Both pumps, therefore, perform the same job but in different ways. Rotary positive displacement pumps utilize the rotational movement of an element (for example, gears, screws, or vanes) to trap the fluid and transfer it from one area to another. During the movement, the liquid is continuously pushed through the pump. The flow rate delivered is independent of the prevalence<\/a> and it is instead directly proportional to the rotation speed.<\/p>\n

Inside the rotary presses, you can find some operational distinctions:<\/p>\n