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Selection of various types of needle valve principle
1, low temperature medium piping systems and devices, should use the valve cover with a low temperature needle valve. 2, oil refining unit of the catalytic cracking unit piping system, optional lifting rod needle valve. 3, acid and alkali chemical systems and other corrosive media and piping systems, should be made of austenitic stainless steel, PTFE valve seat ring all-stainless steel needle valve. 4, Metallurgical systems, power systems, petrochemical plants, urban heating systems in high temperature medium piping systems or devices, the choice of metal to metal seal needle valve. 5, the need for flow control, the choice of worm-driven, pneumatic or electric with V-shaped opening of the needle valve. 6, oil, natural gas pipeline delivery, need to clean the pipeline, but also need to be buried in the ground, the choice of full diameter, all-welded needle valve structure; buried in the ground, the choice of full-diameter welding connection or flange connection Ball valve 7, refined oil pipeline and storage equipment, the choice of flanged needle valve. 8, city gas and natural gas pipeline, the choice of flange connection and internal thread connection needle valve. 9, oxygen pipeline system in the metallurgical system, should be adopted after strictly degreasing, flanged needle valve.