Pneumatic pumps are characterized by being:
- Self-priming.
- Volumetric (can be used as dosing devices).
- Adjustable: from zero to maximum flow rate.
- They are not affected if they work without flow.
- They can work in explosive environments (they are explosion-proof).
- They can transfer loaded and viscous liquids.
Pneumatic pumps are built in two basic versions: diaphragm and piston.
Pneumatic double diaphragm pumps
Pneumatic diaphragm pumps use as impeller two diaphragms joined by a shaft that moves alternately driven by the drive compressed air.
- The body can be built in aluminum, polypropylene, stainless steel, etc.
- The membrane is made of Teflon and other materials appropriate to the fluid to be transferred.
- The maximum outlet pressure of the pumped liquid is equal to that of the compressed air used.
- They are manufactured for flow rates up to
- Diaphragm pumps are economical and therefore suitable for applications with medium reliability requirements, as there is always a risk of diaphragm failure. Piston pumps are recommended for demanding applications.
Pneumatic Piston Pumps
Pneumatic piston pumps use as impeller a piston connected to a shaft to which a pneumatic motor transmits an alternative movement.
Pneumatic piston pumps have great advantages over diaphragm pumps.
- High reliability: the piston is almost impossible to fail.
- Possibility of reaching pressures several times higher than that of the compressed air used, through the use of pistons with a smaller diameter than that of the air motor cylinder.
- Possibility of driving several pumps in parallel by means of a single pneumatic motor, thus building multi-component dosing systems.
- Possibility of reaching flow rates up to 20,000 l/h.
- Possibility of transferring products loaded with typical slaughterhouse materials (guts, blood, various animal wastes, etc.).