How to choose the valve?

High-performance pneumatic pneumatic - valve how to choose? Answer: pipeline 屮 eucalyptus medium type valve, pressure, temperature and flow rate ( Or pipe diameter) Factors such as to choose. Only for gate and globe valves open and close of pipeline and equipment of medium, does not allow for throttling, so as not to shut down and seat valve rapid wear. The same kind of medium as the change of temperature, its pressure, concentration and corrosion situation is changing. Will now for body material from grey cast iron, carbon steel and copper valve under different temperature allowed the use of the maximum working pressure listed in the table class, respectively, for reference when choosing the valve. Table within a certain temperature under the maximum working pressure of code: p word at the bottom right corner filling several yu for the medium temperature is 10, in addition to the integer value in the table for the maximum working pressure under a certain temperature. Such as medium temperature is 240 degrees when the maximum working pressure, expressed in p24. 200 degrees from the table, you can see that the following carbon steel valves, we can choose according to nominal pressure; The temperature increased, the maximum working pressure and nominal pressure of the distance is more and more big, to 450 degrees, the maximum working pressure is smaller than nominal pressure half or more of their kind. Such a big gap, must cause the valve selection of Italy, at relatively high temperature don't only look at nominal pressure, must also know the temperature of the maximum working pressure. 1) Elevating the level of disc high-performance pneumatic pneumatic - valve can only be installed horizontally, disc vertically up. Vertical elevating disc check valves can only be installed vertically, medium flow must be upward. Swing check valves are installed in vertical pipe runs, the medium flow must be upward. 2) Pressure reducing valve, steam trap shall be installed in horizontal pipe runs. The relief valve must be installed vertically up. 3) Gas of high-performance pneumatic pneumatic - valve requires good air-tightness, quickly switch, flexible motion, easy maintenance and good corrosion resistance. You should not use copper valve sealing ring; In case of sulfur impurities in gas corrosion. The gas pipe can be used for oil seal cock valve, special oil seal gate valves, sealing butterfly valve, etc. 4) Oxygen pipeline valve or ball type valve can be used, appropriate USES oxygen special valve. Working pressure p > 1. 1 mpa oxygen pipeline by gate valves shall be strictly forbidden. p < 1。 When 6 earth-sized are malleable iron, nodular cast iron or steel valves; 1. 65). Working pressure (p > 0. 1 mpa hydrogen gas pipeline by gate valves shall be strictly forbidden, appropriate USES plug valves, ball valves, globe valves. P50mm pipe disabled gate valves. Nominal pressure of valve and pipe diameter is as follows: the relation of DN1. 0MPa、DN1. 6MPa； 50mm《DN2. 5MPa。