Valve body material description

The material of the valve body of the mine valve is based on different process media, and different materials are selected.

Commonly used materials are: cast iron, cast steel, stainless steel, carbon steel, plastic, copper, etc.

1. grey cast iron

Gray cast iron valves are used in various fields of industry because of their low price and wide application range. They are usually used in the case of water, steam, oil and gas as media, and are widely used in chemical industry, printing and dyeing, oil chemical, textile and many other industrial products that have little or no impact on iron pollution. It is suitable for low pressure valves whose working temperature is between -15~200℃ and the nominal pressure is PN≤1.6MPa.

2. Ductile iron

Nodular cast iron is a kind of cast iron. In this kind of cast iron, lumps or spheroidal graphite replaces the flake graphite in gray cast iron. The change in the internal structure of this metal makes its mechanical properties better than ordinary gray cast iron, and does not damage other properties. Therefore, valves made of ductile iron have higher operating pressures than those made of gray cast iron. Suitable for medium and low pressure valves with working temperature between -30~350℃ and nominal pressure PN≤4.0MPa. Applicable media are water, sea water, steam, air, gas, oil, etc.

3. Carbon steel

The initial development of cast steel was to meet the production needs of those beyond the capacity of cast iron valves and bronze valves. However, because the carbon steel valve has good overall performance and high resistance to stress caused by thermal expansion, impact load and pipeline deformation, it has expanded its scope of use, usually including the working conditions of cast iron valves and bronze valves. . Suitable for medium and high pressure valves with working temperature between –29~425℃. The temperature of 16Mn and 30Mn is between -40~400℃, and they are often used to replace ASTM A105. The applicable medium is saturated steam and superheated steam. High and low temperature oil, liquefied gas, compressed air, water, natural gas, etc.