( 1) Threaded connection valves

this connection is usually to turn in and out of the end Industrial Valves cone tube or straight thread, can make its connection to the taper pipe nipple or on the road. Because of this connection may appear larger leakage channel, so it can be used sealants, sealing adhesive tape or filler to plug the channel. If the valve body material can be welded, but expansion coefficient difference is very big, or change range of working temperature range is larger, screw thread connection department must be honey sealing. Threaded connection valves mainly nominal menstruation under 50 mm. If size size is too big, installation and connection department seal is very difficult.

in order to install and remove the threaded connection valves, the appropriate placement of the piping system on the available pipe joint. Under 50 mm nominal diameter of valve pipe fittings, pipe socket for use as a pipe socket threads will connect the two parts together.

( 2) Flange connection valves

flange connection of valve, its installation and removal are more convenient. But heavy than the threaded connection valves, the appropriate price is also high. So it is suitable for all kinds of sizes and pressure pipe connection. However, when the temperature exceeds 350 degree, as a result of bolts, gasket and flange slacken, also obviously reduce the load on the bolt, to force a lot of flange connection leaks may be produced.

( 3) Welding connection valves

this connection is suitable for all kinds of pressure and temperature, under the condition of the load moment when using, more reliable than the flange connection. But the welding connection Industrial Valves disassembly and difficult to install, so its use is limited to usually can run reliably for a long time, or use the conditions of Dutch engraved, high temperature occasion. Such as coal-fired power stations, nuclear power engineering, ethylene project on the pipeline.

under 50 mm nominal diameter welding Industrial Valves usually with welding socket to carry on the charge of the pipeline on plane. Because the socket welding forming gap between the pin and pipeline, thus has the potential to crack corrosion by some media, at the same time, the vibration of the pipeline can make the connection part fatigue, so the application of the socket welding by certain restrictions.

in nominal diameter is bigger, use condition load, high temperature, the body is used for welding groove, at the same time, the butt joint with the original requirements, the welders must choose very skillful to complete the job.

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