Diaphragm valve is a special form of shut-off valve, the opening and closing pieces is made of a soft material with the diaphragm, which will valve body cavity and the valve cover cavity separated. The diaphragm is actually a “clamped” valve, a resilient, disturbable diaphragm connected to the compression element by means of a screw, which is operated by the stem and moved up and down. When the compression element is raised, the membrane (If it is a weir valve) or pressed at the bottom of the contour (if it is straight-through type), the diaphragm valve is suitable for switching and throttling, and the diaphragm is pressed against the valve weir Use.
The structural design of the diaphragm itself is particularly suitable for ultra-pure media or heavily polluted, very viscous liquid, gas, corrosive or inert media. When combined with a control device, the diaphragm valve replaces other conventional control systems, especially for solid and easily contaminated inert media. Products are mainly used in the production of bio-pharmaceuticals, foodstuffs, foodstuffs, and electricity, chemical, electroplating, and other industries. They are also used in the production of semiconductor wafers. Diaphragm valves are particularly suitable for transport corrosive and sticky Of the fluid, such as mud, food, pharmaceutical, weaving adhesive, etc., because the pipeline, the diaphragm operating mechanism is not exposed to the transport fluid, it is not polluting, do not need packing, stem packing It can not leak.
The most prominent feature is the diaphragm to the lower part of the valve body cavity and the upper valve cover cavity separated, so that the diaphragm above the stem, disc and other parts from the media corrosion, eliminating the filler seal structure, and will not produce media leakage The
1, the use of rubber or plastic and other soft seal made of the diaphragm, good sealing. As the diaphragm for the wearing parts, depending on the characteristics of the media and regular replacement.
2, by the diaphragm material restrictions, diaphragm valve for low pressure and temperature is relatively low occasions.
3, diaphragm according to the structure can be divided into: house, DC, cut-off, straight-through, gate and right angle six; connection form is usually flange connection; by drive can be divided into manual, electric and pneumatic Three, of which pneumatic drive is divided into normally open, normally closed and reciprocating three.
4. It is not appropriate to use in pipelines with temperatures above 60 ° C and for transporting organic solvents and strong oxidizing media, and should not be used in higher pressure piping
Diaphragm valve is in the 1.3 × 10-5 ~ 2.5X106Pa fluid system used to open or block the air flow of the valve.
Source: China Diaphragm Valve Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)