Self-priming pompa: what is it?

Self-priming pompa: what is it?
Self-priming pompa: what is it?

What does the term “self-priming pompa” mean? To explain this, let’s start by defining the concept of self-priming.

In hydraulics, self-priming is often associated with hydraulic pumps, the ability to suck air into a pipe with subsequent suction of liquid, moving liquid from a height of no more than 6 meters in each case.

In practice, the pompa must be pre-filled with the liquid in question through a port in the pompa housing (chamber containing the impeller). Then turn on the pump to create a turbulent flow to help lift and release the air line. ..

There are several ways to induce this self-priming process, but the most common way is to create more fluid in a tank parallel to the line than is needed to fill the upstream suction line and check valve pompa. Avoid repeating this operation every time you turn on the machine.

In explaining the concept of self-priming, I deliberately mentioned the centrifuge. However, there are various types of pumps that can be associated with this concept, especially positive displacement pumps (diaphragm, peristaltic, vane, etc.).

Debem offers a range of fully pneumatic double diaphragm positive displacement pumps.

A tank parallel to the pump is not required to operate cubic and opposed pump lines.

Self-priming pumpa function

Self-priming pompa: how does it work? Below is a brief description of how to make a boxer pump more preferable than a conventional electric pump.

The air supply always passes through the pump (inlet A) and activates the pumping process.

Situation 1: The diaphragm contracts (left image) to create a vacuum, the suction ball rises due to the attraction of the liquid, and the liquid (and air when the pump is running) can fill the chamber.

Situation 2: The diaphragm expands (right image) pushing fluid out of the pump, lifting the delivered bead and simultaneously pushing it down during suction to close the passage.

This type of operation guarantees liquid suction even when the pompa is not flooded and uses the movement of the ball which is used as a check valve (because it is not always tight and durable, even if it is not). Seal) Creates a vacuum in the suction tube.

The above ultimately applies to a conventional centrifugal pompa, except that the diaphragm is designed and built to withstand the mechanical stress of the self-priming process when needed (no tank, no difference).

How can a centrifugal pump be installed?

As we have seen, the definition of a self-priming pompa is a pompa that initiates the operation of “self-priming” liquid from a container or tank with a negative suction head. That is, the pump is placed above the liquid level. Therefore, all self-priming pompa are used in negative suction head conditions.

Where is it used?

Positive NPSH is in a state where a self-priming pompa can be detected. Prominent examples of such applications are, for example, self-priming pompa for wells or self-priming centrifugal pompa for sewage. Here they are transported to the containment pool.

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