Standard parameters and technical requirements of
2022-10-12- Detail
Standard parameters and technical requirements of needle valve
technical requirements of needle valve:
generally, needle valve materials should be selected according to this standard according to its parameters and material performance, and should comply with the provisions of relevant product standards. Other materials with performance not lower than that specified in this standard or agreed by both parties can also be selected. Under special circumstances, the technical requirements of needle valves are as follows: the temperature of the fire site rises rapidly in a short time, and he said that the continuous action time is long; At the same time
1. Gray cast iron needle valve:
used for gray cast iron valves with nominal pressure PN ≤ 1.0MPa, which will pose a serious threat to the lives and property of passengers. The temperature is -10~200 ℃ for water, steam, air, gas, oil and other media
2. Malleable iron needle valve:
it is used for malleable iron valves of water, steam, air, oil and other media with nominal pressure PN ≤ 2.5MPa and temperature -30~300 ℃
scrap demand is still supported in a short time. 3. Ductile iron needle valve:
ductile iron valve for water, steam, air, oil and other media with nominal pressure PN ≤ 4.0Mpa and temperature -30~350 ℃
4. Copper alloy needle valve:
it is used for water, sea water, oxygen, air, oil and other media with nominal pressure PN ≤ 2.5MPa, as well as steam media with temperature of – 40~250 ℃
5. Carbon steel needle valve:
used for carbon steel valves of water, steam, air, hydrogen, ammonia, nitrogen and petroleum products with nominal pressure PN ≤ 32.0mpa and temperature -30~450 ℃. Valve inlet pump
6. High temperature steel needle valve:
it is used for high temperature steel valve of steam and petroleum products with nominal pressure PN ≤ 16.0mpa and temperature less than or equal to 550 ℃
7. Low temperature steel needle valve:
used for low temperature steel valves of ethylene, propylene, liquid natural gas and liquid nitrogen with nominal pressure PN ≤ 6.4Mpa and temperature higher than or equal to -196 ℃
8. Stainless acid resistant steel needle valve:
used for stainless acid resistant steel valves with nominal pressure PN ≤ 6.4Mpa and temperature lower than or equal to 200 ℃ for nitric acid, acetic acid and other media
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