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DIAPHRAGM VALVE MANUFACTURERS IN INDIA
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Diaphragm
valves (or membrane valves) consists of
a valve body with two or more ports, a diaphragm, and a
"weir or saddle" or seat upon which the diaphragm closes
the valve. The valve is constructed from either plastic
or metal. Originally, the diaphragm valve was developed for use in industrial
applications.
All diaphragm valves are bidirectional. They can be used as on-off and throttling valves. Diaphragm valves offer advantages in certain low-pressure applications not possible with other types of valves. Their fluid passages are smooth and streamlined, minimizing pressure drop. They are suitable for moderate throttling applications, and they exhibit excellent leak-tight characteristics, even when conveying liquids containing suspended solids. The fluid stream is isolated from the working parts of the valve, preventing contamination of the fluid and corrosion of the operating mechanism. Since there is no leak path around the valve stem, the valve is virtually leak tight. This feature makes the valve indispensable where leakage into or out of the system cannot be tolerated.
Diaphragm valves are used on shut-off and throttling service for liquids, slurries and vacuum/gas.The seal is achieved by a flexible membrane, usually elastomer, and possibly reinforced with a metal part. The membrane is tensed by the effect of a stem/compressor with lineal movement until contact is made against the seal of the body.
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 to the handling of multiple chemical applications both clear fluids as well as slurries.
The diaphragm valve has an extended use for applications at low pressures and slurry fluid where most other kinds of valves corrode or become obstructed.
It is a quick opening valve. 
There are two types of diaphragm valves:
- Weir: The Weir Diaphragm valve can be used for either off/on and throttling services
- Straightway: named also Straight-Thru is only used for on/off services.
- Example Diaphragm Closure System
- General Features and ranges for Diaphragm valves
- Diameter ranges:
From 0.5" to 14". - Connection to the pipe:
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). - Temperature range:
From -10ºc (-14ºF) up to +170ºC (+350ºF) - (Depending on material). - Pressure range:
From 13.8 bar (200psi) - (Depending on material). - Fluid Velocity limitation:
15-20 ft/sec for clean fluids and 8-10 ft/sec for slurries. - Typical applications:
Chemical, Fossil Power Plants, Pharmaceutical, Mining, Nuclear Power Plants, Water treatments...
Types of Diaphragm Valves
Primarily there are two basic designs of diaphragm valves: weir and straight-through types. The body interior and the end flanges can be lined to make the diaphragm valves suitable for corrosive applications. Various lining materials can be used, depending upon the application.Weir-Type Diaphragm Valves
As shown in Fig. A, a weir is provided as an integral part of the valve body. The weir acts as the valve seat against which the diaphragm is compressed to stop the flow. This type of diaphragm valve is generally produced in large sizes. The raised weir reduces the amount of diaphragm travel from the fully open to the fully closed position, thus reducing the amount of stress and strain in the diaphragm.Straight-Through Diaphragm Valves
Variations of the weir diaphragm valve are the straightway (Fig. B) |
|
| Fig. B: Straightway-type diaphragm valve | Fig. D: Full-bore-type diaphragm valve illustrating passage of ball-brush cleaner through valve |
The full-bore type of valve is most extensively used in the beverage industry. It permits ball-brush cleaning with either steam or caustic soda, without opening or removing the valve from the line.
Advantages of Diaphragm Valves
The following summarizes some distinct advantages of diaphragm valves:1. Can be used as on-off and throttling service valves.
2. Offer good chemical resistance due to variety of linings available.
3. Stem leakage is eliminated.
4. Provides bubble-tight service.
5. Does not have pockets to trap solids, slurries, and other impurities. It is suitable for slurries and viscous fluids.
6. These valves are particularly suitable for hazardous chemicals and radioactive fluids.
7. 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.
Disadvantages of Diaphragm Valves
1. The weir may prevent full drainage of piping.2. Working temperatures and pressures are limited by the diaphragm material. Generally the pressures are limited to 200 psi (1380 kPa) and temperatures up to 400 F (204 C).
3. The diaphragm may also limit the hydrostatic pressure.
4. The diaphragm may experience erosion when used extensively in severe throttling service containing impurities.
5. Diaphragm valves are available in limited sizes, usually NPS ¹⁄₂ to 12 (DN 15 to 300).
Typical Applications of Diaphragm Valves
1. Clean or dirty water and air service applications2. De-mineralized water systems
3. Corrosive applications
4. Radwaste systems in nuclear facilities
5. Vacuum service
6. Food processing, pharmaceutical, and brewing systems
Diaphragm Valves Materials
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Citizen Metals
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Diaphragm Valve
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