From the connection mode, both of them belong to mechanical connection, that is, the joint between stainless steel and pipe fittings is sealed by hydraulic deformation with special clamping machinery.
Clamping connection
Clamping is a connection method suitable for stainless steel water pipes. Connect the pipeline with socket fittings with sealing rings, and press the nozzle with special tools for sealing and fastening. The basic composition of clamping pipe fittings is end >: special-shaped pipe fittings with O-rings in U-shaped grooves. When assembling, the stainless steel pipe is inserted into the pipe fitting and sealed with a special sealing tool. The pipe fitting and the pipe at the sealing position are extruded into a hexagon to form the corresponding connection strength, and at the same time, the sealing effect is produced due to the compression deformation of the sealing ring. The cost of pipe fittings is low, the engineering installation is simple and the construction speed is fast.
Scope of application: it is mainly used to connect various pipes with a diameter not greater than 100.
Disadvantages of clamping connection:
1. Once stuck, it cannot be disassembled. If there is an error during installation, it will only be scrapped.
2. In the installation process, if the burr at the pipe end is not cleaned, the apron inside will be destroyed, which will lay a hidden danger for future pipeline leakage.
3. Large initial investment and many special tools.
Ring compression connection
Ring pressure connection is a kind of pipe connection method which uses special tools to squeeze special sealing ring, pipe fittings and pipe circumference into a whole. A cylindrical wide-band sealing ring is sleeved on the pipeline, inserted into the socket of the annular pressure pipe fitting, and pressed from the outside along the circumferential direction of the socket with a special tool, so that the socket and the pipeline are deformed in a concave way, and the sealing section of the socket is compressed, thereby realizing the connection mode of fastening the sealing pipe fitting.
Scope of application: It is mainly used for connecting various pipes with diameters of DN 15-DN 150.
Advantages of annular pressure connection:
The successful application of 1 and ring pressure connection technology in DN 125 and 150 large-diameter pipelines has established the outstanding position of ring pressure technology in the same industry at home and abroad. Because it is difficult to ensure the firmness of large-diameter pipeline extrusion connection, so far, other extrusion technologies except ring pressure can only be used for pipeline connection below DN 100, and pipeline connection above DN 100 adopts welding, groove or flange connection. Only ring pressing technology can realize the cold extrusion connection of DN 150.
2. Ring pressure connection does not change the external shape of the pipeline, but forcibly shrinks the outer diameter of the pipe fitting along the circumferential direction by external force, forcing the pipe fitting to be recessed and embedded in the pipeline. After ring pressing, the joint between the pipe fittings seems to mesh with each other, and at the same time, the forced contraction produces a clamping force at each point of the concentric circle of the pipe fittings at 360 degrees, so that the pipe fittings are clamped.
3. The design of the sealing cavity of the ring pressure connection makes the leak-proof function of the system connection more firm.
Ring pressure stainless steel pipe fittings
The successful application of ring pressure connection technology in DN 125 and 150 large-diameter pipelines has established the leading position of Rufalai ring pressure technology in the same industry at home and abroad. Because it is difficult to ensure the reliability of large-diameter pipeline extrusion connection, so far, other extrusion technologies except ring pressure can only be used for pipeline connection below DN 100, and pipelines above DN 100 are connected by welding, groove or flange. Only ring pressure technology can realize cold extrusion connection from DN 15, so ring pressure connection is the first choice for thin-walled stainless steel pipes.