Needle Valves
Introduction:
General needle valve for thread connection, needle valve has a wide range of uses, can adapt to oil, water, gas and other non-corrosive or corrosive media, so the needle valve should be selected properly.
Selection Principles:
1. Low-temperature needle valve with valve cover should be selected for the piping system and device of low-temperature medium.
2. Lifting rod type needle valve can be selected on the pipeline system of catalytic cracking unit of refining unit.
3. In the installation and piping system of acid, alkali and other corrosive media in the chemical system, it is appropriate to choose the stainless steel needle valve made of austenitic stainless steel and the PTFE valve seat sealing ring.
4. metallurgical system, power system, petrochemical equipment, urban heating system in the high temperature medium piping system or device, can choose metal to metal sealing needle valve.
5. the need for flow regulation, can choose worm gear and worm drive, pneumatic or electric with V-shaped opening adjustment needle valve.
6. the transmission of oil and natural gas main line, need to clean the pipeline, and need to be buried in the ground, the selection of full diameter, full welding structure of the needle valve; Buried in the ground, choose full-diameter welded or flanged ball valve connection.
7. the transmission pipeline and storage equipment of refined oil, the choice of flange connected needle valve.
8. On the pipeline of city gas and natural gas, the needle valve with flange connection and internal thread connection is selected.
9. In the oxygen piping system of the metallurgical system, the needle valve with flange connection should be selected after strict degreasing treatment.
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