Stainless steel needle valve selection principles

Stainless steel needle valve selection principles:
1, the pipeline system and cryogenic medium, should use low temperature plus bonnet SS needle valve.
2, the pipeline system FCCU refining apparatus, the choice of needle valve lift rod.
3, apparatus and piping systems of chemical systems and other corrosive acid medium, should use austenitic stainless steel, Teflon seat ring of stainless steel needle valve.
4, metallurgy systems, piping systems or devices on power systems, petrochemical plants, urban heating systems in high-temperature media, the choice of metal seal needle valve.
5, transporting oil products pipelines and storage facilities, the choice of the needle valve welded connection.
6, city gas and natural gas pipelines, the choice of the needle valve flange connection and female connection.
7, oxygen pipeline system, should be strictly degreased.