A factory in the industrial water, salt water, recycling brine, electrolyte, lye, hydrogen, sulfuric acid, chlorine and chlorine water system has been using cut-off valve, gate Industrial Valves and control valve diaphragm valve as a process. With the production scale expands unceasingly, the process control level continuously improve, more and more high to the requirement of process control valve in one power plant, used for years in the above system of cut-off valve, gate valve, diaphragm valve, due to the structure itself and the defect on the material directly affect the safety and reliability, economic rationality and manipulability, thus more and more can not adapt to the needs of modern production. For example, cut-off valve, gate valve defects of valve core is easy to fall off; Diaphragm valve diaphragm is easy to damage; Cut-off valve, gate valve, the valve stem in general adopt packing seal, packing and vertical movement up and down the stem friction directly, such as valve switch frequently, the packing is easy to wear, not only cause material leakage, but also pollute the environment; Cut-off valve, gate valve, the transmission mechanism of the leakage, if the valves do not frequently switch or improper maintenance, the valve stem and the gaps between the drive nut is easy because of corrosion or dust and other foreign matter accumulation and difficulties caused by the valve opening and closing. To completely solve the above problems, a factory technicians to according to the characteristics of each material system gradually to select different seal butterfly valve to replace the original use of cut-off valve, gate valve, diaphragm valve, has obtained certain achievements. 1 the advantages of the butterfly valve butterfly valve compared with cut-off valve, gate valve, diaphragm valve has the following advantages: ( 1) Reasonable structure, easy to change, under the condition of the same diameter, smaller volume, lighter; （ 2) The valve opening and closing by manipulating the handle or worm gear and worm drive device to drive the stem, disc from 90 & deg; Rotary motion, the valve open or closed; Not only the valve opening and closing rapidly, and the manipulation is simple and labor-saving; （ 3) Has a larger channel flow section rate and excellent flow characteristics; （ 4) can be installed in any position to use, and the flow direction of medium is not subject to restrictions; （ 5) Rotation control handle or handwheel position, can adjust the medium flow of pipeline, and has good cutting and regulation performance; （ 6) Compared with the cut-off valve, gate valve, diaphragm valve, each valve static seal point reduce two points, effective to reduce the risk of valve leakage. ( 7) By bolt seat fully adjustable, can adjust seat or replacement seats and seat at the scene within components, without special tools, also don't have to remove the valve, convenient for daily maintenance and repair; ( 8) Transmission device enclosed inside the valve seat, completely avoid the erosion of the corrosive gas and moisture, without special maintenance, reduce the labor intensity of the operators. The usage and effect evaluation of 2. 1 circulating water system of the original use of gate valve, because do not frequently switch valve and open place, between the stem and transmission nut gap easily caused by corrosion or dust and other foreign matter accumulation and valve opening and closing is difficult, especially & Phi; 300年,φ; More than 400 specifications of gate valve sometimes need 2 ~ 3 people cooperate to switch valve. In addition, the larger valve size, quality, replace the Industrial Valves need hoisting machinery to cooperate. Instead of butyl eye gel after a ductile iron seal butterfly valve, valve control, adjust easily not only, only one person can complete, and no replacement valve hoisting machinery. 2. 2 chlorine gas compressor outlet valve the original use of stop valve in one power plant, despite the sealing effect is good, but due to the structure limit valve open/close for a long time. Have occurred chlorine compressor switch due to export the valve failed to switch, chlorine water seal, a small amount of leakage caused by chlorine gas. After the valve to the F4 a stainless steel sealing butterfly valve, after years of use, manipulation of personnel evaluation is extremely high. Agreed that the valve switch easily, quickly, when switching eliminates chlorine compressor outlet valve switch may cause not in time for chlorine leak. 2. 3 lye conveying system to company internal lye in one power plant, first by Yang liquid receiver, using compressed air pressure delivered through pipelines to lye. Liquid Yang import and export valves used in globe valve. As a result of 0. 3 to 0. 5 mpa compressed air pressure, pressure in the process of sending cut-off valve packing leakage often finished lye. On the one hand, cause the finished product alkali loss, on the other hand also pollute the environment. Therefore, the liquid will Yang import and export of nitrile a ductile iron valves to seal butterfly valve, lye got thoroughly solve the leakage problem. 2. 4 salt water, recycling brine, electrolyte system usage & Phi; 100 ~ 250 specifications of the gate valve. Because the system of material itself have strong corrosion resistance, strong permeability, valve packing easy leakage, salt, even strengthen the daily inspection and maintenance, still cannot be fundamentally solved. Another valve manufacturers generally USES the carbon steel material valve core card, the card valve core are easy to be material corrosion, valve core loss. Salt water pump plant, mixed salt water pump, electrolyte preheater and the import and export of equipment the valve several times due to valve core loss system local short time change valve, brought instability to safety production. After technical personnel according to the characteristics of the system of material corrosion, choose d eyes glue a ductile iron seal butterfly valve to replace the original gate valve, and gradually promotion, eliminates the valve core is easy to fall off the unstable factors, leakage problem is also solved.
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wedge valve are less complex compared with cast iron gate valve.