Synthetic rubber is superior to natural rubber in its oil resistance, temperature resistance and corrosion resistance. Generally, the using temperature of synthetic rubber is lower than 150 °C (t ≤ 150 °C), and that of natural rubber is lower than 60 ° C (t ≤ 60 °C). Rubber is used for shut-off valve, gate valve, diaphragm valve, butterfly valve, check valve, pinch valve and other valves whose nominal pressure is smaller than 1 MPa (PN ≤ 1MPa).
Nylon has the characteristics of small friction coefficient and good corrosion resistance. Nylon is mostly used for ball valves and globe valves with a temperature less than 90 ° C (t ≤ 90 °C) and a nominal pressure smaller than 32 MPa (PN ≤ 32 MPa).
Teflon is mostly used for shut-off valves, gate valves, ball valves, etc. with temperature t ≤ 232 ° C and nominal pressure PN ≤ 6.4 MPa.
Cast iron is used for gate valves, globe valves and plug valves for gas and oil transportation. The using tempertature t ≤ 100 °C, nominal pressure PN ≤ 1.6 MPa.
Babbitt alloy is used for ammonia shut-off valves with a temperature of t-70 to 150 ° C and a nominal pressure of PN ≤ 2.5 MPa.
Common materials for copper alloys are 6-6-3 tin bronze and 58-2-2 manganese brass. Copper alloy has good wear resistance and is suitable for water and steam with temperature t≤200°C and nominal pressure PN≤1.6MPa. It is commonly used for gate valves, globe valves, check valves, plug valves, etc.
Chrome stainless steel
Common grades of chrome stainless steel are 2Cr13 and 3Cr13, and their corrosion resistance is good. Chromium stainless steel is commonly used on valves of water, steam and petroleum media with a temperature of t ≤ 450 ° C and a nominal pressure of PN ≤ 32 MPa.
Chrome nickel titanium stainless steel
The common grade of chrome-nickel-titanium stainless steel is 1Cr18Ni9ti, which has good corrosion resistance, erosion resistance and heat resistance. It is suitable for mediums such as steam and nitric acid with temperature t≤600°C and nominal pressure PN≤6.4MPa, used for shut-off valves, ball valves, etc.
The commonly used grade of nitriding steel is 38CrMoAlA, which has good corrosion resistance and scratch resistance after carburizing treatment. Commonly used in power station gate valves with temperature t ≤ 540 ° C and nominal pressure PN ≤ 10 MPa.
The boronizing is directly processed from the valve body or the valve body material to the sealing surface, and then the boronizing surface is treated, and the sealing surface has good wear resistance. Used for power station drain valve.
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