Needle valve is an important part of instrumentation piping system, there are stop valves and ball valves, its function is to open or cut off the pipeline access. Needle valve material should be based on the parameters and material properties according to the standard selection, and should be consistent with the provisions of the relevant product standards. Can also use the performance of not less than the provisions of this standard or other materials agreed upon by both parties to the contract. Here are eight different types of needle valve: 1. Gray cast iron needle valve for nominal pressure pN ≤ 1.0MPa, the temperature of -10 ~ 200 ℃ water, steam, air, gas and oil media such as gray Cast iron valve. 2. Malleable cast iron needle valve For nominal pressure pN≤2.5MPa, temperature -30 ~ 300 ℃ water, steam, air and oil and other media malleable iron valve. 3. Ductile iron needle valve for nominal pressure pN≤4.0MPa, temperature -30 ~ 350 ℃ water, steam, air and oil and other media ductile iron valve. 4. Copper alloy needle valve for nominal pressure pN≤2.5MPa of water, seawater, oxygen, air, oil and other media, and the temperature is -40 ~ 250 ℃ vapor medium copper alloy valve. 5. Carbon steel needle valve for nominal pressure pN≤32.0MPa, temperature -30 ~ 450 ℃ water, steam, air, hydrogen, ammonia, nitrogen and petroleum products and other media of carbon steel valves. 6. High temperature steel needle valve for nominal pressure pN ≤ 16.0MPa, temperature less than or equal to 550 ℃ steam and petroleum products and other media of high temperature steel valves. 7. Cryogenic steel needle valve for the nominal pressure pN ≤ 6.4MPa, the temperature is higher than or equal to -196 ℃ of ethylene, propylene, liquid natural gas and liquid nitrogen and other media of low-temperature steel valves. 8. Stainless steel acid needle valve For nominal pressure pN ≤ 6.4MPa, the temperature is lower than or equal to 200 ℃ nitric acid, acetic acid and other media stainless steel acid-resistant steel valve.
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