Welding Type Needle Valve
Selection principle of welding type needle valve: 1, low temperature medium pipe system and device, it is appropriate to choose with a low temperature needle valve cover. 2. In the pipeline system of catalytic cracking unit of oil refining unit, lifting rod type needle valve can be selected. 3, the chemical system of acid and alkali and other corrosive media device and pipeline system, it is appropriate to choose austenitic stainless steel manufacturing, ptFE seat sealing ring of all stainless steel needle valve. 4, metallurgical systems, power systems, petrochemical installations, urban heating system in the high temperature medium of the pipeline system or device, can choose metal to metal sealing needle valve. 5, the need for flow regulation, can choose worm gear worm transmission, pneumatic or electric with V-shaped opening regulating needle valve. 6, oil, natural gas transmission main line, the need to clean pipelines, and buried in the ground, use full size, all welded structure of the needle valve; Buried in the ground, select full size welded or flanged ball valves. 7, the finished oil pipeline and storage equipment, choose the needle valve flange connection. 8, city gas and natural gas pipeline, the choice of flange connection and internal thread connection of the needle valve. 9, metallurgical system in the oxygen pipeline system, it is appropriate to choose after strict degreasing treatment, flange connection of the needle valve.
Keyword： Welding Type Needle Valve
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Selection principle of welding type needle valve:
1, low temperature medium pipe system and device, it is appropriate to choose with a low temperature needle valve cover.
2. In the pipeline system of catalytic cracking unit of oil refining unit, lifting rod type needle valve can be selected.
3, the chemical system of acid and alkali and other corrosive media device and pipeline system, it is appropriate to choose austenitic stainless steel manufacturing, ptFE seat sealing ring of all stainless steel needle valve.
4, metallurgical systems, power systems, petrochemical installations, urban heating system in the high temperature medium of the pipeline system or device, can choose metal to metal sealing needle valve.
5, the need for flow regulation, can choose worm gear worm transmission, pneumatic or electric with V-shaped opening regulating needle valve.
6, oil, natural gas transmission main line, the need to clean pipelines, and buried in the ground, use full size, all welded structure of the needle valve; Buried in the ground, select full size welded or flanged ball valves.
7, the finished oil pipeline and storage equipment, choose the needle valve flange connection.
8, city gas and natural gas pipeline, the choice of flange connection and internal thread connection of the needle valve.
9, metallurgical system in the oxygen pipeline system, it is appropriate to choose after strict degreasing treatment, flange connection of the needle valve.
Materials for main parts
Design and Manufacture: GB/T12223-89
Nominal diameter:1/8"(8mm)-4"(100mm)
Welding size: JB/T 1751-75
Length of structure: GB12221
Inspection and experiment: GB/T13927
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