Ordinary butterfly valve body material arrangement order.
1. gray iron gray iron valve for its low price, wide range of applications and applied in all fields of industry. They are usually used in the medium of water, steam, oil and gas, and are widely used in chemical, printing and dyeing, oil refining, textiles, and many other industrial products which have little or no effect on iron pollution.Suitable for working temperature between - 15 ~ 200 degrees, low pressure valve nominal pressure PN is less than 1.6MPa.
4. carbon steels (WCA, WCB, WCC) originally developed for steel to meet the production needs beyond those of cast iron valves and bronze valves. But due to the use of the good performance of carbon steel valve, and the resistance strength stress on by thermal expansion, impact load and deformation of pipeline, makes its use scope, usually including the use of cast steel valves and bronze valve operating conditions.It is suitable for middle and high pressure valves whose operating temperature is between - 29~425. Among them, 16Mn and 30Mn are used as the temperature between 40~400 and A105, which is often used instead of ASTM. Applicable medium is saturated steam and superheated steam. High temperature and low temperature oil, liquefied gas, compressed air, water, gas and so on.5. low temperature carbon steel (LCB) low carbon steel and low nickel alloy steel can be used below zero temperature range, but can not be expanded to use in cryogenic zone. Valves made of these materials are suitable for the following medium, such as seawater, carbon dioxide, acetylene, propylene and ethylene.Low temperature valve suitable for operating temperature between 46~345 and.
2 FCMB for working temperature between - 15 ~ 300 DEG C, nominal pressure PN is less than or equal to 2.5MPa in the low pressure valve. Applicable medium is water, sea water, gas, ammonia and so on.3 ductile cast iron ductile iron is a kind of cast iron, the cast iron, nodular or spherical graphite instead of flake graphite in gray cast iron. This change in the internal structure of the metal makes its mechanical properties better than ordinary gray iron, and does not harm other properties. Therefore, the valves made of ductile iron use more pressure than those made of gray iron. Suitable for working temperature between - 30 ~ 350 DEG C, nominal pressure PN is less than or equal to 4.0MPa in the low pressure valve.Applicable medium is water, sea water, steam, air, gas, oil and so on.
