Using the effective rigidity of the metal material and the elastic compression ratio principle of the sealing material, and at the same time making full use of the length of the socket, the pipe is clamped on the pipe by the radial contraction external force (hydraulic clamp), and the water is stopped by the O-ring seal. Achieve the connection effect. Such as stainless steel press fittings.
Generally, the larger diameter of the press connection can be DN100. Grande-Tek is a professional China SS press fitting manufacturer.
It can realize the thinning of pipes and fittings, save materials, and have low connection strength (the connection strength of the interface is less than 1/3 of the strength of the pipe body). However, the pipes after the press operation cannot be disassembled. At the same time, pay attention to the burrs and flashes of the pipe ports to be cleaned, otherwise it will damage the rubber ring and become a hidden danger of water leakage in the future.
The hot melt process is adopted to weld the two connecting pieces to achieve the connection effect.
The advantage is that the connection strength is high, but relatively speaking, the on-site construction will be more difficult. The main factor is that the welding seam gas protection of the on-site welding joint is difficult to meet the standard, which causes the welding seam to rust easily, which directly reduces the service life of the pipeline. Workers are highly dependent on technology, and quality is difficult to stabilize.
Socket welding connection
An extension of the welded connection, inserting the pipe into the pipe fitting and then extending the side of the pipe fitting to make an argon arc welding connection so that the pipe fitting is self-melted into a whole.
The connection is reliable and requires almost no maintenance. The cost is low, and the cost of this type of product is lower than other connection methods. The specifications are complete, and the specifications of this type of pipe fittings are relatively complete.
There are similar construction problems with welding construction, but the socket welding pipe fittings are produced through a water expansion process similar to the press fittings to expand the joint position of the pipe fittings, and the pipe can be completely inserted into the pipe fittings during the construction of socket welding pipe fittings.
Welding construction, as the name implies, is called socket welding connection. Through such a small improvement, socket welding pipe fittings are more reliable than general welding pipe fittings.
Use the nut to tighten the pipe fitting to axially compress the pipe with the expanded conical sealing ring and the pipe fitting, and achieve the connection effect through the water stop of the conical sealing ring.
The grooved pipe fitting is a kind of pipe fitting that is easy to install and disassemble.
The connection of grooved pipe fittings is mainly completed by clamps. Clamps are necessary for groove connection, but the cost of casting clamps is very high. And because of its detachability, its tightness cannot reach the long-term such as pressing welding, and it cannot work under too large negative pressure pipeline.
For thin-walled stainless steel water pipes, grooved pipe fittings are generally used in pipes with diameters above DN100, while the smaller castings such as clamps in grooved stainless steel pipe fittings must be DN50 to meet the requirements of users and manufacturers ’ economic benefits of the product.
Tightening bolts are used to connect the two connecting pieces with flange pieces, and the plane sealing piece is sealed to achieve the connection effect.
The flange is a very mature connecting pipe fitting, which is detachable and has high connection strength, high pressure bearing strength, easy installation and stable quality. The flange processing is generally made of stainless steel round rods through cutting and lathe processing. higher cost.
Tighten the pipe fittings or pipes directly, tighten the two connecting pieces with the inner
and outer interfaces of the tapered pipe thread, and achieve the connection effect through the pressure seal of the connecting connector thread (the same as the traditional threaded galvanized steel pipe seal).
A commonly used connection method in the era of galvanized pipes and water pipes. The pipe fittings or pipes are directly screwed, and the two connectors with the inner and outer interfaces of the tapered pipe thread are tightened, and the pressure seal of the connecting connector thread (with traditional wire The galvanized steel pipe seal is the same) to achieve the connection effect.
However, this connection method is not commonly used in the era of thin-walled stainless steel water pipes. The simpler reason is the thinning of stainless steel water pipes. Due to the thickness problem, screw-type connection, which requires the pipe threading treatment, is used in thin-walled stainless steel pipes. Stainless steel water pipes are not desirable.