Determining the characteristics of the use of the regulating valve is the main use of performance and use scope of the valve, belong to the characteristics of the valve use valve categories, types of products, such as the major parts material and the valve drive. Structural characteristics it determine the valve installation, maintenance, maintenance methods of some structural features, belongs to the structure characteristics of the valve structure length and the overall height, and pipeline connection form, the form of the sealing surface and structural form of the valve stem. It is important to note that in some structure formation, the using characteristics and structural characteristics are correlated, not separate. The adjustment of the control valve and cut off the control has been a difficult problem in automatic production control, as for the high temperature and ultra high temperature cut off difficulty is larger. This problem is the main performance of high temperature resistance and cutting problems, so the regulator of high temperature and ultra high temperature control has been the focus of attention. We should be how to choose the suitable regulator? 1, the regulating valve body and trim material selection problem: used in the environment above 450 ℃ in the regulator, general materials can use temperature about 500 ℃. For the occasion of higher than 500 ℃, the body usually adopt chrome molybdenum steel. For the temperature of 1000 ℃ or so, usually choose SUS310S stainless steel, carbon content and materials must be controlled in 0. 038-0. 078%. The lining for higher temperature, the recommended non-metallic refractory material ( Can be used in the high temperature of 1200 ℃) Or special high temperature resistant high strength alloy ( Such as the engine combustion chamber, high temperature resistant high strength alloy can be directly used in 1000 ℃ high temperature occasion) 。 2, regulating Industrial Valves packing heat resistance performance: the standard of ptfe packing can only be used for under 200 ℃, if need to use in the high temperature occasion, so need to adopt elongation type bonnet in order to prevent the packing under the influence of high temperature, but longer thinner stem under the condition of high temperature strength is poorer, prone to bending phenomenon. So high temperature should be adopted under the condition of good performance of flexible graphite packing, also can reduce the height of the elongation type bonnet. At the same time can also configure 'rotary valve + coarse stem' way to improve the integrated intensity of the valve, so as to better solve the problem. 3, the choice of the ways of regulating valve seal: under the condition of high temperature to achieve high cutting performance is relatively difficult, a lot of conventional high performance sealing way is not an option ( Such as the four fluorine material, o-ring, elastic metal materials, etc. ) 。 Within 500 ℃ can be used in a special way of compound graphite soft seating. Under the condition of above 500 ℃ can only use a metal to metal hard seal way ( General structure of butterfly valve) 。 4, the selection of regulating valve: the fluid has a certain viscosity, impurities in more, want to choose is not easy to jam, good from clean sex types, such as butterfly valve, diaphragm valve, Angle valve; If fluid poisonous and harmful, must choose with bellows sealed valve, to ensure strict five discharge, ensure use safety.
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