The choice of pneumatic valve end connection form

a common form of connection in pneumatic valve end flange connection, threaded connections, butt welding and socket connection.


flange connection flange connection is advantageous to the pneumatic valve installation and removal. Pneumatic valve end flange sealing surface form mainly has the plane ( FF, tu surface ( The RF, concave ( FM, grooved surface ( TG and RTJ ( RJ etc. Pneumatic valve USES the API standards flange is ASMEB. Etc. Sometimes on the flange connection of the pneumatic valve can meet the Class and Class rank, and this is the stress level of the cast iron flanges, connected to the Class and Class size is the same, only the first two of the sealing surface is flat, FF。
the wafer ( Wafer and lug ( Originally the pneumatic valve is also made of flange connection.

butt welding
because of butt joint high strength, good sealing, so the butt welding of pneumatic valves in the chemical industry system is mostly used in some high temperature and high pressure, inflammable and explosive occasions.

socket welding and threaded connection
is commonly used in pipeline system of nominal size does not exceed the DN, but can not be used in a crevice corrosion fluid.
threaded connections shall not be used for highly toxic, flammable medium pipeline, also should avoid to use in cyclic loading condition. With current projects in use in place of pressure is not high. The thread form on the pipeline is mainly cone pipe thread, taper pipe threads are two specifications, the cone apex Angle ° and ° respectively, both can't swap. On combustible or highly harmful medium pipeline, if the installation needs, must adopt thread connection, the nominal dimension at this time should not exceed the DN, the threaded connection seal of the reentry after welding.