when we choose the Industrial Valves, according to such procedures and basis for commonly: 1, determine the nominal diameter of tube and the valve connection mode: flange, threaded and welding, etc. 2, clear the valve used in equipment or devices, valve operation conditions were determined: suitable medium, working pressure, working temperature and so on. 3, determine the valve operation mode: manual, electric, magnetic, electrical and pneumatic or hydraulic linkage or electro-hydraulic linkage, etc. 4, according to the pipeline medium, working pressure, working temperature to determine the selected valve shell and internal parts of material: gray cast iron, malleable cast iron, ductile iron, carbon steel, alloy steel, stainless acid-resistant steel, copper alloy, etc. 5, choose the types of valves: closed valves, regulating valves, safety valves, etc. 6, determine the type of valve: gate valve, globe Industrial Valves, ball valve, butterfly valve, throttle valve, safety valve, relief Industrial Valves, steam trap, etc. 7, the valve parameters: for automatic valves, according to different needs to allow flow resistance, discharge capacity, back pressure, etc. , to determine the nominal pipe diameter and the diameter of the valve seat hole. of 8, determine the selection of geometric parameters: the length, shape and size flange connection structure, the size of the height direction after the opening and closing valve, connection bolt hole size and quantity, the whole valve installation dimensions, etc. 9, using existing data: the valve catalogue, choose proper valve products such as valve products sample.

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