Stainless steel pipe fittings connection methods and their respective advantages and disadvantages

There are many ways to connect stainless steel pipe fittings. The mainstream ones include compression connection, ring pressure connection, flange connection, groove connection, welded connection and tapered thread connection. They each have their own pros and cons, and you need to find a suitable method in the actual situation.
Snap-on connection
The connection principle of this method is to use hydraulic pliers to clamp the stainless steel pipe fittings on the pipe, and at the same time use an O-ring to achieve a water-stopping effect, thereby achieving a connection effect. Although this method is easy to operate, the pipe wall is very thin, the connection strength is as low as only about one-third of the pipe body, and the pipe cannot be disassembled. If the burrs and flash edges of the stainless steel pipe port are not removed cleanly, the rubber ring will be easily damaged. It's easy to leak.
Ring pressure connection
The principle of ring pressure connection is to use hydraulic pliers to clamp stainless steel pipe fittings on the pipe, and use wide-band rubber sealing rings to stop water, so as to achieve a good connection effect. Because this method has one more pressure pit than the compression type, the connection strength is slightly stronger than the compression type. In addition, because the pressure pit is annular, the pipe is easy to rotate, which will affect the overall sealing effect.
Flange connection
The principle of flange connection method is to use tightening bolts to connect two connecting parts with flange plates, and then seal them with flat sealing plates to achieve the corresponding connection effect. The advantage is that the connection strength is of high quality and stable, easy to install and removable, but the disadvantage is that the cost of the flange is relatively high.
Grooved connection
The principle of this method is to tighten the nuts of the pipe fittings to axially compress the stainless steel pipes and pipe fittings with expanded convex rings, and then use the cone sealing ring to stop water, thereby achieving the connection effect. The advantage is that it is detachable, but the disadvantage is that the installation process adds a process of rolling a concave ring at the pipe end, the cost of the cast clamp is relatively high, and it cannot be used in pipelines with negative pressure.
Solder connection
The connection principle of this method is to directly weld the two connecting parts through a hot melt process to achieve a connection. The advantage is that the connection strength is high, but the disadvantage is that the weld gas protection of the on-site welding joint is difficult to meet the standard, the weld seam is easy to rust, which will reduce the service life of the pipeline, and the installation quality depends largely on the welder's technology. level, so the quality stability is not high.
Taper thread connection
The connection principle of this method is to directly tighten the stainless steel pipe fittings, tighten the two connecting parts with the inner and outer interfaces with conical pipe threads, and use the pressure of the connection threads to achieve the sealing effect, thereby completing the connection. Its advantages are that it is easy to disassemble, the strength of the connection port reaches the strength of the pipe body, it is convenient and simple to install, the quality is reliable and stable, and the thin wall of the pipe fitting results in lower cost. In addition, if the external thread interface is wrapped with polytetrafluoroethylene raw material tape, it needs to be added Strength, and if you use liquid raw material tape, you can basically guarantee that the interface will not leak for a long time.