1. 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.
2. The conveying pipeline and storage equipment of the refined oil are selected from the flanged needle valve.
3. For the pipelines of city gas and natural gas, needle valves with flange connection and internal thread connection are selected.
4. In the oxygen pipeline system in the metallurgical system, a needle valve that has undergone strict degreasing treatment and flange connection should be used.
5. For low temperature medium piping systems and devices, a low temperature needle valve with a bonnet should be used.
6. On the pipeline system of the catalytic cracking unit of the refining unit, a lifting rod type needle valve can be selected.
7. In the chemical system, such as acid and alkali corrosive medium and piping system, it is advisable to use all-stainless steel needle valve made of austenitic stainless steel and Teflon as valve seat seal.
8. Metal-to-metal sealed needle valves are available on the piping systems or devices of high-temperature media in metallurgical systems, power systems, petrochemical plants, and urban heating systems.
9. When flow adjustment is required, a worm-gear, pneumatic or electric adjustment needle valve with a V-shaped opening can be selected.
If any other requirements or changes are made below, they shall be stated in the order contract:
1. Valve specifications (in pounds valves expressed in inches; metric valves in millimeters)
2. Pressure rating or nominal pressure
3. Flange connection size and sealing surface form
4. Welding end and its aperture
5. Socket and thread end size
6. Structure length
7. Fireproof, anti-static device
8. Need worm gear drive or pneumatic, electric
9. Need to lock the structure, whether to lock
10. Materials (including main body, valve stem, fasteners, etc.)
11. Gasket
12. Filler
13. Sealing surface material matching (ball sealing surface and seat sealing surface)
14. Others
For the size specifications, please provide detailed parameters, the factory is produced according to the national designated standards.
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Types of wheelchairs
1. According to material classification, aluminum alloy, light material and steel aluminum alloy, light material and steel.
2. According to the type, it can be divided into manual Wheelchair and electric wheelchair, among which manual wheelchair can be divided into manual push and self-service type.
3. According to people's needs, it can be divided into single side wheelchair, toilet wheelchair, sports wheelchair and lying wheelchair.
4.According to whether it can be folded It can be divided into foldable and unfoldable wheelchairs.
Wheelchair
Medicare Wheelchair,Multifunction Wheelchair,Wheelchair Rehabilitation,Folding Electric Wheelchair
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