the diaphragm valve

open-close part ( The diaphragm) Driven by the valve stem, do lifting movement along the axis of the stem, valve, separated and the action mechanism and the medium is called diaphragm valve.

the purpose of the diaphragm valve diaphragm valve as part of the block valves, mainly used in the occasion of corrosive medium and do not allow the leakage. The current domestic production more is the roof type diaphragm valve. The scope of its parameters are as follows: nominal size DN15 ~ 400; Nominal pressure sPN40; Working temperature ts170 ℃.

the diaphragm valve is different from general valve is the main use of soft rubber diaphragm as control flow on and off or adjust flow components. It has simple structure, good sealing, smooth flow, flow resistance coefficient is relatively small, widely used in viscous medium, micro fluid particles and corrosive medium in the pipeline, especially in the thermal power system of the water treatment device has been widely used.

due to the effect of rubber diaphragm Industrial Valves, the valve is in open or closed position, the flow passage of corrosive medium from the drive valve parts, valve body with carbon steel, ductile iron, aluminum alloy and stainless steel. And there are many kinds of rubber lining inside the valve cavity or fluorine plastics, enamel, etc. , so the generation of precious metal diaphragm valve can use ordinary materials and corrosion resistance, wear resistance.

diaphragm valve production at present, there are two major development direction, is a large-scale, high parameters, mainly in order to adapt to all kinds of special requirements. Such as nominal pressure can reach PN16 ~ 40, the maximum stress level can be up to 4. 5 mpa, the working temperature can reach - 65 ~ 200 ℃, the highest temperature can reach 300 ℃. Diaphragm valve in addition to meet the 300 mw, 600 mw and 1000 mw large thermal power unit of the water treatment system, are also used in 900 mw nuclear power plant. The second is to meet the need, and form a complete set of general industrial piping so as to adapt to a variety of corrosive medium, suitable for medium to nearly 400 ~ 700. The service life of the rubber diaphragm for more than 10, ten thousand times, the highest can reach 270000 ~ 500000 times. Its operation forms and drive are manual, pneumatic, electric and hand - Pneumatic, etc.

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