These pumps can be constructed in materials ranging from Aluminium, Stainless steel, Polypropylene, Acetal, Kynar (PVDF) and certain sizes in Hastelloy wetted parts are available for special applications.
The moving parts internally that come in contact with the fluid being transfered, can be a combination of many materials from Aluminium to PTFE.
The pumps have an inlet or suction side where the fluid enters the pump, and an outlet or discharge side where the fluid leaves the pump.
The fluid when leaving the pump, will be at a given fluid pressure, that suits the application taking in to account any friction loss .
These Double Diaphragm pumps are often referred to as Diaphragm pumps, are driven by a supply of air from an air compressor and not driven by an electrical supply.
The air supply to the pump is normally regulated to a certain pressure, usually around 3 to 4 Bar, and because the magority of pumps have a 1 to 1 ratio, this means if the air supply is 3 Bar then the fluid leaving the pump will be 3 Bar.