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Diaphragm Valves

Diaphragm valves come in two basic forms – weir or straight-through. Straight-through diaphragm valves are used in on-off or isolation applications only, while the weir types are used for isolation or control. Both are available as manual or automated valve assemblies.

The key design feature of diaphragm valves is, you guessed it, the flexible diaphragm used for sealing off the application. Diaphragms are typically made from elastomers or polymers because of their flexible nature. When less flexible materials are required such as Teflon, the diaphragm becomes a two part system, with a flexible material in place behind the more rigid material, enabling the valve to seal properly.

No internal cavities

Diaphragm valves have no internal cavities or crevices to entrap process fluids and materials. This makes them ideal for Food & Beverage processing, as well as Pharmaceutical applications. Stainless steel bodies and highly polished metal surfaces make Diaphragm valves great aseptic options.

The main factor that limits diaphragm valves is their insufficient performance in higher pressure applications. Because of the diaphragm membrane’s inability to maintain shape under pressure, CGIS typically recommends other valve designs for applications equal or above Class 150 (PN20).
Chemline—Type 14 Diaphragm Valve

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