Diaphragm valves have been around for a long time. In ancient Greece and Rome, individuals used this type of valve to control the water temperature and flow in hot baths. The diaphragm valve was modernized in the early s by a South African mining engineer, P.K. Saunders, whose company continues to manufacture these types of valves today.
Diaphragm valves are perhaps one of the most configurable types on the market, well-suited for the highly sanitary processing needs of the biotechnology and pharmaceutical manufacturing industries.
Their versatility is due to the nature of how these valves work and their construction.
As the illustration below shows, diaphragm valves consist of a valve body and a flexible elastomeric membrane that combine to control the flow of a fluid. To close the valve, the membrane/diaphragm seals against a seat or weir.
Weir type diaphragm valves are the most common type of diaphragm valve. They are suitable for a variety of applications (e.g., pharmaceutical, food, and beverage applications) due to their high cleanability. They are also used in throttling applications.
The flexible diaphragm is connected to a support mechanism known as a compressor which is used to open and close the diaphragm.
The most common diaphragm valve configuration is two-port (also called a two-way diaphragm valve). Three-port or three-way configurations are also common. Much more complex configurations have multiple ports and may have more than one weir as well as more than one diaphragm and actuator. These complex configurations are used for mixing, dividing, controlling, draining, sampling, or feeding.
A significant advantage of this type of valve is that only two parts of the valve come in contact with the fluid being processed:
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All other working components &#; such as the compressor &#; are isolated from the fluid flow path.
This isolation makes diaphragm valves suitable for use with many kinds of fluids and cleaning applications. The diaphragms can also be easily replaced or switched to a different diaphragm material if compatibility is an issue. In some cases, the compressor must be swapped out in order to switch diaphragm materials due to the different connection type of the diaphragms.
Weir type diaphragm valves are widely used in many industries for their excellent performance and reliability when controlling the flow of fluids. Here are 5 important facts about weir type diaphragm valves that you may not know:
1. The first recorded use of a diaphragm type valve was in ancient Rome, the roman variant of a diaphragm valve was used to control the water flow and temperature of the hot baths
2. Today they are one of the most versatile types of valves available, able to be used for a variety of applications including process control, regulating and even in a relief function
3. Unlike other types of valves, weir type diaphragm valves are hermetically sealed which means they can be used in hazardous or explosive environments without fear of leaks.
4. Unlike other valves by nature of design the Weir type diaphragm valve is cavity free, perfect for clean water, pharmaceutical and food manufacturing applications
5. Weir type valves have multiple nick names &#; some of which are saddle valve, block Valves, A type valves and ridge valves, occasionally mistakenly called a pinch valve, however a pinch and diaphragm valve are complete separate entities.
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