1, clamping connection-divided into single clamping and double clamping. Double card pressure is the most stable connection mode. The external force (hydraulic tongs) contracted radially is used to clamp the pipe fitting on the pipe, and the connection effect is achieved by sealing the O-ring. Convenient operation, good sealing and non-disassembly.
2. Ring-expanding connection: the pipe fitting is clamped on the pipeline by radial contraction external force (hydraulic tongs), and the water is stopped by a wide-band rubber sealing ring to achieve the connection effect, which is detachable, and the process of installing the pipeline by rolling the convex ring at the pipe end is added; The sealing property is general, and the cost of casting pipe fittings is high.
3. Welding connection-The two joints are welded by hot melt process to achieve the connection effect. The connection strength is high, and the welding gas protection at the field welding joint is difficult to meet the standard, which leads to the rust of the weld and directly reduces the service life of the pipeline; The installation quality is highly dependent on the welding workers' skills, and the quality is difficult to stabilize.
4. Self-locking connection-it was first used to connect small-caliber plastic hoses, and it can be quickly installed without tools. The interior of the interface is easy to loosen and leak, and the sealing performance is poor.