Characteristics and structural shape of butt welding flange
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Characteristics and structural shape of butt welding flange
Butt welding flange is used to connect stainless steel valves. The butt welding flange is provided at both ends of the valve body, which corresponds to the butt welding flange on the pipeline. The butt welding flange is fixed by bolts and installed in the pipeline. Butt welding flange connection is the most widely used connection form in stainless steel valves. Butt welding flange can be divided into raised face (RF), flat face (FF), convex concave face (MF), etc. According to the shape of the joint surface, it can be divided into the following categories:
1) Smooth type: used for stainless steel valves with low pressure. Easy to process
2) Concave convex type: high working pressure, medium hard washer can be used
3) Mortise and groove type: the washer with large plastic deformation can be used widely in corrosive medium, and the sealing effect is good.
4) Trapezoidal groove type: oval metal ring is used as gasket for valve with working pressure ≥ 64kg / cm2, or high temperature valve.
5) Lens type: gasket is lens shape, made of metal. For high pressure valve with working pressure ≥ 100kg / cm2, or high temperature valve.
6) O-ring type: This is a relatively new form of butt welding flange connection, which is developed with the emergence of various rubber O-rings.
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