The operation and characteristics of diaphragm pumps
Diaphragm pumps are positive displacement pumps in which the reciprocating operation inducing fluid movement is achieved by means of an elastic diaphragm which is repeatedly actuated by mechanical, hydraulic or pneumatic means. The movement of the diaphragm causes a decompression, followed by the fluid entering the pump head, to generate a new compression and final expulsion of the fluid.
One of the most popular variants of this pumping system are pneumatic diaphragm pumps, which, unlike mechanical or hydraulic diaphragm pumps, use compressed air to operate. This type of pump is ideal for pumping liquids with a high solids content, fluids that are toxic, aggressive or highly corrosive in nature. They have the advantage of having no rotating parts or mechanical seals and are very simple to operate.
Advantages of using diaphragm pumps
Diaphragm pumps are widely used in the food industry, water treatment, paper industry, petrochemical and chemical processes. Due to this variety of applications, they have become the most versatile pumps on the market. They are mainly used for the transfer of viscous fluids, with a high content of particles in suspension, as in the case of food extracts, dairy products, yoghurt, cream cheese; emulsions such as mayonnaise; concentrates such as tomato sauce, fats, liquid chocolate, etc.
They are also an excellent choice for pumping caustic fluids, provided that the diaphragm is made of a resistant material such as Teflon. Among the advantages of their use are the following:
They are very easy to operate and maintain, as they have a simple and robust design.
They can transfer critical material safely.
The diaphragm adapts to a wide range of materials, making them chemically and thermally stable under different operating conditions.
They are self-priming, so there is no need to prime the pump to start operation.
They can operate dry without damage to the system.
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