Grey cast iron pneumatic valves and malleable iron pneumatic valve selection of 4

procurement staff the choice of pneumatic valves, they should be paid attention to: malleable iron gray cast iron either in the press, pneumatic valves and pneumatic valve working pressure and temperature, under the following circumstances, it is not allowed:
) In addition to the liquid and gaseous ammonia than poisonous gas and liquefied petroleum gas pipeline.
) The vibration of the pipeline to bear.
) In pipeline medium temperature of dramatic change.
) After the gas pressure drop through the narrow channels of throttling effect, will make a big cooling pneumatic valve, pneumatic valve cooling malleable iron, grey cast iron pneumatic valve, - at low temperature ℃ to - ℃ below.
in the natural gas transportation) Containing condensate water and other liquids, easy wall temperature is lower than ℃.
) The tension in the pipeline.
7) By the pneumatic valve, if the gas pressure inside the pipeline may be due to the sudden rise in operating temperature and overpressure pneumatic valve operation requirements at work.
in addition, working in a gas pipeline pressure more than. Mpa not allowed shell parts casting.
everything, correct selection of pneumatic valves, pneumatic valves and the key is to understand the basic theory of pneumatic valve application. When choosing pneumatic valves, should first consider to use. For example: water, oil, coal and of the pneumatic valve in the pipeline pneumatic valve closed petrochemical industry, therefore, in this pipe, pneumatic valve should be in the first place.
with pneumatic valve industry continue to flourish, the development, sales and procurement staff pneumatic valve will have great development prospects. Should pay enough attention to the quality of sales and purchase, sales and purchase only when the pneumatic valve researchers chose to analyze and judge the knowledge and skills, types, familiar with the structure of the pneumatic valve, pneumatic valve for project status element is the most correct choice, reasonable good pneumatic valve products.
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