1. For low temperature medium piping systems and devices, a low temperature needle valve with a bonnet should be used.
2. On the pipeline system of the catalytic cracking unit of the refining unit, a lifting rod type needle valve can be selected.
3. In the equipment and piping system of chemical medium such as acid and alkali, etc., it is advisable to use all-stainless steel needle valve made of austenitic stainless steel and PTFE as the seat seal.
4. For metallurgical systems, power systems, petrochemical plants, high temperature media piping systems or devices in urban heating systems, metal-to-metal sealed needle valves are available.
5. When flow adjustment is required, a worm-gear-driven, pneumatic or electric adjustment needle valve with a V-shaped opening can be selected.
6. The main line for the transportation of oil and natural gas, the pipe that needs to be cleaned, and the underground pipe, the needle valve with full-diameter and all-welded structure is selected; if it is buried on the ground, the full-diameter welded connection or flange connection is selected. Ball valve.
7. The conveying pipeline and storage equipment of the refined oil are selected from the flanged needle valve.
8. On the pipelines of city gas and natural gas, needle valves with flange connection and internal thread connection are selected.
9. In the oxygen pipeline system in the metallurgical system, a needle valve that has undergone strict degreasing treatment and flange connection should be used.
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