For people who are often in contact with stainless steel water pipes, most people will choose to use the snap connection, ring pressure fittings this connection can be very strange. Some people also question why stainless steel water pipes can not be connected by means of thread, quick release, etc., but the choice of ring pressure connection?
In the past, stainless steel water pipes commonly used connection methods.
A, welding type
Including butt argon arc welding, socket argon arc welding. With tungsten argon arc welding (TIG) to the seam mouth or connection socket or do ring fusion welding into one connection.
Welding connection is a universal connection, but the welding of stainless steel needs to do a good job of gas protection inside and outside the pipe. Otherwise, it will greatly reduce the corrosion resistance of stainless steel. Due to the high efficiency of this method is more cost effective, the actual stainless steel pipeline welding in water supply are not used in this method, resulting in serious oxidation of the inner wall of the stainless steel pipe welding parts corrosion resistance is reduced.
Advantages and disadvantages of welding.
Reliable connection, simple structure of fittings
1, the operation is difficult, high construction costs
2, there is a strong heat source and electrically operated, the operation of fire safety hazards.
3, the site operation is difficult to do a good job in the weld protection, resulting in stainless steel pipe wall peroxidation, and after welding can not remove the oxidation layer, very easy to rust and corrosion.
Second, the threaded type
When using threaded connections, by the depth of the thread of stainless steel pipe requires a greater thickness, while processing threads on stainless steel is much more difficult than processing threads on galvanized steel pipe. At the same time threaded connection construction efficiency is low.
Including bendable, compression, ferrule, ring expansion type
By tightening the nut, so that the internal components of the fittings hold the tube, and supplemented by an end or side seal of a connection.
Advantages and disadvantages of threaded connections
Features: Quick installation and removable.
Problems
1、The reliability of the connection is relatively weak, and the threads tend to loosen when subjected to vibration, resulting in a small compression force of the nut on the seal and leakage.
2、The structure of the fittings is complicated and there are many parts. Resulting in high cost of fittings.
3, can not be buried.
Scope of application: used for temporary piping with a caliber not greater than 50 and not concealed.
Third, the card pressure connection
Snap connection is a connection method applicable to stainless steel water pipes. With a sealing ring socket fittings connected to the pipe, with special tools to tighten the mouth of the pipe to play a sealing and fastening role of a connection. The basic composition of the compression fittings is the end > U groove with a special shape of the O-ring seal pipe joints. When assembled, the stainless steel pipe is inserted into the pipe fittings, sealed with a special sealing tool, sealing part of the pipe fittings, the pipe is squeezed into a hexagonal shape, thus forming the corresponding strength of the connection, while the sealing effect is produced due to the compression deformation of the sealing ring. The cost of the fittings is low, the project is simple to install, and the construction speed is fast.