industry in China are rising steadily, corresponding to the traditional markets of North America and the eu as a valve product, although still occupy a larger market share of global valve market, but in terms of growth will be slow. According to the analysis, the report is expected over the next three years the valve leading products export growth rate at about 25% on average. Enterprises should seize the historical opportunity to realize spanning development, booster valve manufacturing industry in China from a big manufacturing towards manufacturing power! leakage losses in the production of the petrochemical industry valve leakage, the economic loss and environmental pollution caused by the degree of dielectric properties of different and different. If the gas medium, it's easy to spread in the air, the pollution radius will be large. Liquid medium will produce pollution through the infiltration of the ground, may through the open trench or person having drainage culvert flow, pollution of the rivers and lakes and other environment. On December 3, 1984 in the morning, India Bhopal pesticide plant one containing 45 t poisonous liquid cylinder atmosphere of vinegar acid armour poisonous liquid in the tank leak to break through the valve and tilting moment between into thick smoke waft in Bhopal, densely populated urban areas, in just a few days, gas killed 2800 people, more than 520000 people by different degree of mischief, and there are more than 100000 people lifelong disability. The former Soviet union's chernobyl nuclear power plant because of a valve and caused an unprecedented disaster, not only caused serious casualties, caused by the direct and indirect economic loss and environmental damage is difficult to measure. Statistics show that about 20% of the valve leakage problems in industrial devices, the direct economic losses caused by account for about 5% of the total loss of 0 in the petrochemical industry, with a 5000 kt/a scale often pressure-relief devices, for example, usually around 5000 valves, by 20% of the valve leakage caused by the economic loss and pollution to the environment to be reckoned with, if from the point of the petrochemical industry, the situation is more serious. Countermeasures to optimize design selection can minimize the degree of valve leakage, achieve the longest service life, depending on valve design selection is reasonable, the selection of sealing, the valve product quality, installation, construction and operation whether accord with standard, etc. , and is largely depends on the valve on the selection of design optimization. on the selection of design optimization, involving the choice of the form of the valve, the valve itself in designing and manufacturing, a variety of problems, such as material selection of the valve. Selecting valve forms, from the process conditions and demands of the design specification requirements, such as Angle consider to conduct a comprehensive optimization. The purpose of the valve, medium temperature, pressure, flow rate, pressure drop and the corrosive medium, etc. , are directly affect the valve selection, but also according to the medium temperature and corrosion resistance, used in manufacturing valve materials. , according to the construction and practical operation experience, the selection of valves in addition to meet the technical requirements, design specification, also should fully consider various specific circumstances, to make it match the operating conditions as far as possible, maximum limit meets the requirement. For liquid, gas or two phase fluids, compared to using a gate or globe valve and ball valve, the effect will be significantly different. Ball valve tightness is superior to the gate and globe valves, opening and closing speed is more quickly, but using temperature range is greatly less than gate and globe valves. In general, most of the ball valve cannot be used at high temperature. The gate and globe valves under the condition of high temperature performance is stable. Ball valve of the pressure loss is smaller than gate and globe valves, valve compared with the pressure loss is bigger than the pressure loss of gate valve, this is determined by the structure of the valve inner form. For the effect of different material flow velocity and flow adjustment, its effect also can use different types of valve. Should not be commonly use under the condition of high speed flow cut-off valve, because in the case of high-speed flow cut-off valve of the pressure loss is the largest, but stop valve on the discharge regulation was much better than gate valves and ball valves. When choosing valve type, but also according to the medium temperature and corrosive considering manufacturing valves used materials. materials must be used to meet the requirements of the process conditions of valve working point. According to the requirements of the working point process, reasonably choose the material of valve core and valve body, can prolong the service life of the valve without substantially increase the cost. Simply the pursuit of high grade material will only cause unnecessary waste of material. Gland leakage countermeasures of gland seal leakage due to valve, sealing leakage and body connection, is the key to the valve leakage, so you need to pay special attention to. The traditional soft packing seal, is to rely on the packing gland axial pressure, make in the stem and packing, and packing and stuffing box wall, produce certain radial contact stress and sealed. Gland of axial force, therefore, must be quite big, it is caused by packing and increase the friction torque between the valve stem, wear, soft packing wear fast, thus must tighten gland bolts or change filler, often to keep up the good sealing effect. Proper packing and packing are adopted, can improve the reliability of the valve using, prolong service life. Such as by the combined use of flexible graphite packing ring, than use flexible graphite ring packing sealing effect is good. Using a single flexible graphite packing ring in domestic situation more; Abroad, by the use of flexible graphite packing ring combination method has been gaining ground, and achieved good effect.
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