Body and cover direct contact with the media, medium pressure and corrosion, the materials used in the regulation of medium temperature and pressure must be up to the mechanical properties and good cold and hot working process. Because of the body and cover shape is more complex, so the casting molding method. Given the emergency cut-off valve is installed on the three types of pressure vessel, and we have highly toxic and corrosive medium, body of the casting quality is especially important. Precision casting technology in recent years a large number of applications, so the nominal size DN 50 mm or less, the body and cover using precision casting of LCB steel castings, 25 or 35 steel. As a result of the survey emergency cut-off valve for liquid chlorine storage media device, its sealing surface material must be resistant to corrosion and erosion of liquid chlorine. In addition, because of this kind of valve sealing argued that if the medium pressure and spring force, large sealing force cannot be added, so the seal choice ptfe and chromium nickel stainless steel composite structure. Ptfe good corrosion resistance, low friction coefficient, chemical stability strong, suitable for use in liquid chlorine medium. Chromium nickel stainless steel ( Commonly used type 0 cr18ni9, 0 cr18ni9 cr18ni9ti, 1 and 1 cr18ni9ti) Good corrosion resistance, low temperature resistance and erosion resistance, relatively suitable for liquid chlorine medium, its temperature range can be in - Within 196 ~ 600 ℃. Sealing surface and the linear expansion coefficient of ontology material should be close, and set of sealing ring structure is very important also, lest produce loose under additional stress. Spring is the key to the emergency cut-off valve parts, the quality of the big spring affect the sealing performance and service life of the Industrial Valves, then affects the flow cut off the quality of the small spring performance, and quality depends largely on the spring spring material. Relative to emergency cut-off valve spring is 1 cr18ni9 kind of austenitic stainless steel material, should handle only proper, ability of liquid chlorine corrosion, and can guarantee the quality of spring. Pilot valve and the flow valve and so is the body direct contact with the media parts, if these parts are medium corrosion, directly affect the service life of emergency cut-off valve, serious when still can appear safety accidents. So direct contact with the media parts choose the austenitic stainless steel, according to different application requirements, determine the different heat treatment methods. Emergency cut-off valve on the use of the o-ring is to prevent leakage of medium, liquid chlorine corrosion resistance, its outer for ptfe ring, the inner layer for silicone rubber ring, rubber is suitable for the condition of temperature and ageing resistance. Coated o-ring is strong oxidizing medium corrosion resistance of sealing element. In this paper, the keyword search: more Industrial Valves product information
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