Diaphragm valves got the name from a flexible disc which comes into contact with a seat at the top of the valve body to form a seal. A diaphragm is a flexible, pressure responsive element that transmits force to open, close or control a valve. The operating parts of the diaphragm valve are isolated from the flow. This makes this valve suitable for viscous flows and also hazardous, abrasive and corrosive flows as its sealing system avoids any contamination towards or from the environment.
Diaphragm valves are available in a wide variety of metals, solid plastics, plastic, rubber and glass linings. They are well suited for handling multiple chemical applications both clear fluids as well as slurries. The diaphragm valve used for various applications at low pressures and slurry fluid where other kinds of valves either corrode or become obstructed. It is a quick opening valve.
There are two types of diaphragm valves:Weir: Used for either off/on and throttling services.
Straightway: Only used for on/off services.
- Sizes: available upto 12 inch
- Valve rating: upto 180 psi
- Connection: Butt-weld, Clamp, Flange, Screwed, Socket and Spigot Weld
- Diaphragm Material: Buna N (NBR), Butyl (CIIR), Ethylene Propylene Rubber (EPDM), Hypalon® (CSM), Natural Rubber (NR), Neoprene (CR), PTFE and Viton® (FKM)
- Operation: Hand Wheel / Pneumatic Cylinder / Electric Motor Actuator
- Pressure rating: ASME 125/ 150# / PN10 / PN16 / PN25
- Temperature: upto 170° C
- Typical Application: Chemical, Fossil Power Plants, Pharmaceutical, Mining, Nuclear Power Plants, Water treatments