What is Diaphragm Valve?
A diaphragm valve is a type of linear motion valve used to start, regulate, and stop fluid flow. The name comes from the flexible disc that forms a seal with a seat located in the open area at the top of the valve body.
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Principle of Operation of Diaphragm valves are actually "pinch clamp" valves. A stud moulded into a resilient, flexible diaphragm connects it to a compressor. The valve stem moves the compressor up and down in the valve diaphragm. As a result, when the compressor is raised, the diaphragm lifts. As the compressor is lowered, the diaphragm is pressed against the contoured bottom of a straight through valve or the body weir of a weir-type valve.
The better throttling valve is the weir-type diaphragm control valve, but it has a limited range. It makes use of a two-piece compressor. When the valve is opened, instead of the entire diaphragm lifting off the weir, the first increments of stem travel raise an inner compressor component, causing only the central part of the diaphragm to lift. This results in a small opening through the centre of the valve. After the inner compressor is fully open, the outer compressor component is raised along with the inner compressor, and the remaining throttling is similar to that of a conventional valve. The stem of a diaphragm valve does not rotate.
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Some diaphragm valves are equipped with a quick-opening bonnet and a lever operator. A 90° turn of the lever shifts the valve's diaphragm from full open to full close. Chain wheel operators, extended stems, bevel gear operators, air operators, and hydraulic operators are all options for diaphragm valves.
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● Throttling service can also be provided by diaphragm valves.
● Because of the large shutoff area along the seat, its throttling characteristics are essentially those of a quick opening valve.
● To control small flows, a weir-type diaphragm valve is available.
● Diaphragm valves are especially well-suited for handling corrosive fluids, fibrous slurries, radioactive fluids, and other fluids that must be kept clean.
● A diaphragm valve's operating mechanism is not exposed to the media within the pipeline. Sticky or viscous fluids cannot enter the bonnet and wreak havoc on the operating mechanism.
● Many fluids that would clog, corrode, or gum up the working parts of most other types of valves will pass through a diaphragm valve with no problems. Lubricants used in the operating mechanism, on the other hand, must not contaminate the fluid being handled.
● There are no packing glands to maintain, and there is no risk of valve stem leakage.