Diaphragm Pumps

The air valve directs pressurized air to the back side of diaphragm 1. The compressed air is applied directly to the liquid column separately by elastometric diaphragms. The diaphragm acts as a separation membrane between the compressed air and the liquid. Driving the diaphragm with air instead of the shaft balances the load and removes mechanical stress from the diaphragm, dramatically extending diaphragm life. The compressed air moves the diaphragm away from the center block of the pump.
The opposite diaphragm is pulled in by the shaft connected to the pressurized diaphragm. Diaphragm 2 is now on its air exhaust stroke; air behind the diaphragm has been forced out to atmosphere through the exhaust port of the pump. The movement of diaphragm 2 toward the center block of the pump creates a vacuum within chamber 2. Atmospheric pressure forces fluid into the inlet manifold forcing the inlet valve ball off its seat. Liquid is free to move past the inlet valve ball and fill the liquid chamber.
Air-operated double diaphragm pumps can move anything from fine chemicals (gentle, non-shearing action), to abrasive and viscous slurries (no close-fitting parts, low internal velocities), and almost any other product that can move. A few of the thousands of products now being pumped:
Paints & solvents
Pigments
Resins
Construction water & waste
&
Mine tailings
Chemicals
Oils & lubricants
Glues & adhesives
Dyes
Foods
Tanker loadingunloading
Marine barges
Ceramic slips, slurries & glazes
Latex
Driller's mud
Inks & printing liquors
Against filter press
Low density powders
Handling Barrels, Jerry Cans, Carbouys.