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About Diaphragm Valves and Diaphragm Valve Manufacturers Including: Biotech Valves, Hygienic Valves, Process Valves, Weir Valves & Zero Static Tee Valves.
A diaphragm valve is a shutoff or control valve with a flexible membrane, or
diaphragm, which seals the valve completely or partially once the valve is
engaged. Once the actuator is engaged, a stem within the valve pushes a plug
or compressor against the diaphragm. The diaphragm is pushed against a raised
section of the valve, creating a seal. This seal stops the flow of liquid,
gas or other material through the valve. Diaphragm valves are able to seal
more tightly than other types of valves due to their flexible membrane.
Types of Diaphragm Valves
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- Controls that switch the position of a valve from open or
partially open to partially or completely closed. Actuator operation
may be manual, pneumatic or hydraulic. Diaphragm Valve From Wikipedia, the free encyclopedia Diaphragm valves (or membrane valves) consists of a valve body with two or more ports, a diaphragm, and a "saddle" or seat upon which the diaphragm closes the valve. The valve is constructed from either plastic or steel. Originally, the diaphragm valve was developed for use in non-hygienic applications. Later on the design was adapted for use in the bio-pharmaceutical industry by using compliant materials that can withstand sanitizing and sterilizing methods. There are two main categories of diaphragm valves: one type seals over a "weir" (saddle) and the other (sometimes called a "straight-way" valve) seals over a seat. The main difference is that a saddle-type valve has its two ports in line with each other on the opposite sides of the valve, whereas the seat-type has the in/out ports located at a 90 degree angle from one another. The saddle type is the most common in process applications and the seat-type is more commonly used as a tank bottom valve but exists also as a process valve. While diaphragm valves usually come in two-port forms, they can also come with three ports and even more. When more than three ports are included, they generally require more than one diaphragm; however, special dual actuators can handle more ports with one membrane. Diaphragm valves can be manual or automated. Their application is generally as shut-off valves in process systems within the food and beverage, pharmaceutical and biotech industries. The older generation of these valves is not suited for regulating and controlling process flows, however newer developments in this area have successfully tackled this problem. In addition to the well known, two way shut off diaphragm valve, there are many other forms of the diaphragm valve including: three way zero deadleg valve, sterile access port, block and bleed, valbow and tank bottom valve just to name a few. Actuators Diaphragm valves can be controlled by various types of actuators. The most common diaphragm valves use pneumatic actuators; in this type of valve, air pressure is applied through a Schrader valve which raises the diaphragm and opens the valve. This type of valve is extremely quick and as such is one of the more common valves used in operations where valve speed is a necessity. Hydraulic diaphragm valves also exist for higher pressure and lower speed operations. Some diaphragm valves are also controlled manually. Materials used to construct diaphragm valve body • ABS (Acrylonitrile butadiene styrene) | ||||||||||||||||||||||||||
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| Phone: 877-977-5377 |
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