There are two main categorises: metal and nonmetal valve seal materials. Commonly used materials and their conditions of use are as follows: 1, synthetic rubber, synthetic rubber, oil resistance, heat resistance, corrosion resistance and so on comprehensive performance is better than that of natural rubber. Temperature t 150 ℃ or less general synthetic rubber, natural rubber t 60 ℃ or less and rubber is used in the nominal pressure of PN 1 mpa or less cut-off valve, gate valve, diaphragm Industrial Valves, butterfly valve, check valve, pipe valve seal valve, etc. 2, nylon, nylon has a small friction coefficient, good corrosion resistance, etc. Nylon for t temperature of 90 ℃ or less more, nominal pressure PN acuities were 32 mpa ball valve, stop valve, etc. More than 3, ptfe teflon for t temperature of 232 ℃ or less, nominal pressure PN 6 or less. 4 mpa cut-off valve, gate valve, ball valve, etc. 4, cast iron, cast iron is used t temperature of 100 ℃ or less and nominal pressure PN 1 or less. 6 mpa, gas and oil in gate valves, globe valves, plug valves, etc. 5, babbitt babbitt is used t - temperature 70 ~ 150 ℃, nominal pressure PN 2 or less. 5 mpa ammonia with globe valve. 6, copper alloy, copper alloy have 6 - commonly used materials 6 - Tin bronze and 58-3 2 - 2 manganese brass, etc. Copper alloy good abrasion resistance, suitable for temperature t 200 ℃ or less, nominal pressure PN 1 or less. 6 mpa water and steam, is often used in gate valve, globe valve, check valve, plug valves, etc. 7, chromium stainless steel chromium stainless steel commonly used brand has 2 cr13 and 3 cr13 after tempering treatment, good corrosion resistance. Commonly used in temperature t 450 ℃ or less, nominal pressure PN acuities were 32 mpa medium such as water, steam and oil on the valve. 8, chromium nickel titanium stainless steel chrome nickel titanium for 1 cr18ni9ti stainless steel commonly used brand, its corrosion resistance, erosion resistance and heat resistance performance is good. Apply to the temperature t 600 ℃ or less, nominal pressure PN 6 or less. 4 mpa steam, nitric acid medium, such as for globe valve, ball Industrial Valves, etc. 9, nitriding steel nitriding steel commonly used brand is 38 crmoala, after carburizing treatment, has good corrosion resistance and abrasion resistance. Commonly used in temperature t 540 ℃ or less, nominal pressure PN 10 mpa or less power station gate valve. 10, boronizing boronizing process directly by the body or Industrial Valves body material out of the sealing surface, then boronizing surface treatment, sealing surface wear-resisting performance is very good. Used in power station drain valve. In this paper, the keyword search: more valve product supply information
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