Construction

Diaphragm valves consist of a rigid body formed with a weir placed in the flow path,   a flexible diaphragm which forms the upper pressure boundary of the valve, a compressor which is used to force the diaphragm against the weir, and the bonnet and handwheel which secure the diaphragm to the body and actuate the compressor. Diaphragm valves are manufactured in a variety of end connections: welding end socket or butt welding; flanged, screwed, or threaded; clamp ends or grooved ends; solvent cement joint ends forvalves are manufactured in a variety of end connections: welding end socket or butt welding; flanged, screwed, or threaded; clamp ends or grooved ends; solvent cement joint ends for themoplastic valves; and male sanitary threaded ends. Diaphragm valves are available in a wide choice of body, diaphragm, and lining materials that are suitable for service with a wide variety of chemicals. For severe corrosive applications, diaphragm valves are made of stainless steel or PVC plastics, or they are lined with glass, rubber, lead, plastics, titanium, or still other materials.

Advantages:

The following summarizes some distinct advantages of diaphragm valves:

• Can be used as on-off and throttling service valves.
• Stem leakage is eliminated.
• Offer good chemical resistance due to variety of linings available.
• These valves do not permit contamination of flow medium, thus they are used extensively in food processing, pharmaceutical, brewing, and other applications which cannot tolerate any contamination.

• Does not have pockets to trap solids, slurries, and other impurities. It is suitable for slurries and viscous fluids.
• Provides bubble-tight service.
• These valves are particularly suitable for hazardous chemicals and radioactive fluids.