Diaphragm pumps are self-priming positive displacement pumps which can transfer liquids with low, medium or high viscosity and also liquids with solids content using reciprocating pistons to pressurize fluids and force them through an outlet valve. Thanks to the reciprocating action of diaphragms, diaphragm pumps separate the oil-bath mechanical part from the pumped liquid. Diaphragm pumps can also handle aggressive chemicals or acid substances because they can be constructed with particular body materials and diaphragms, resistant to corrosion. 
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