Diaphragms
Diaphragms serve as the heart of the pump. These membranes move from concave to convex, similar to contact lenses, serving as a separation membrane between the air and liquid side ( “dry” and “wetted” side). Mechanical life varies based on air volume, pressure, and chemical being transferred. Diaphragms are a key wear part due to the constant movement and flex and should be evaluated regularly. As with ball valves, diaphragms are available in different materials, all of which can be selected to match specific application specs, from high to low temperatures to highly abrasive ingredients, or chemically aggressive materials. For a list of diaphragm materials, see the “ball valve” section.