Common pipe connection methods include the following:
1. Threaded connection
· Principle: The pipes are closely connected to each other and to the valves by using internal and external threads.
· Applicable pipes: Steel pipes, copper pipes and high-pressure pipes.
· Features: Simple to manufacture and use, reliable connection, detachable and reusable, but with relatively low pressure resistance, and prone to corrosion and leakage at the threaded parts.
2. Welding connection
Principle: By heating or pressurizing, the connection points of the pipes are brought to an atomic bonding state.
· Applicable pipes: Metal pipes, such as steel pipes.
· Features: The interface is firm and durable with good sealing performance, but welding deformation and residual stress may occur, affecting the load-bearing capacity of the joint.
3. Flange connection
· Principle: Install flanges at the end of the pipe and fasten the flange plates together with bolts.
· Applicable pipes: Pipes of various materials, often used for connecting valves, check valves, etc. on main roads.
· Features: High connection strength, good sealing performance, easy to disassemble and maintain, but relatively high cost.
4. Groove connection (clamp connection)
· Principle: Process a ring-shaped groove at the pipe joint and connect it with a clamp and a rubber sealing ring.
· Applicable pipes: Steel pipes, commonly used in building water supply, fire protection water supply, etc.
· Features: Does not damage the galvanized layer of the pipe, quick construction, good sealing performance, and easy disassembly.
5. Ferrule connection
· Principle: The pipe is pressed tightly onto the pipe fitting by means of a lock nut and an open ring.
· Applicable pipes: Small-diameter water supply and gas systems.
· Features: Easy to install, no special tools required, detachable, but with a relatively low safety factor.
6. Crimping connection
· Principle: Sealing is achieved by the deformation of O-rings.
· Applicable pipes: Aluminum-plastic pipes.
· Features: Quick construction, good sealing performance, but limited application range and insufficient safety.
7. Socket connection
· Principle: Insert one end of the pipe into the socket at the other end, and achieve sealing through packing or sealing rings.
· Applicable pipes: cast iron pipes, ceramic pipes, plastic pipes, etc.
· Features: Simple connection, suitable for pipeline systems with low pressure.
8. Adhesive connection
· Principle: Use adhesive to bond homogeneous pipes and pipe fittings together.
· Applicable pipes: Plastic pipes such as PVC and ABS.
· Features: Simple construction, fast curing speed, but relatively low heat resistance and impact resistance.
9. Hot-melt connection
· Principle: Heat the pipe ends to melt them and then connect them
Cool and solidify.
· Applicable pipes: Plastic pipes such as PPR and PE.
· Features: Firm connection, good sealing performance, but high requirements for construction conditions.
10. Quick coupling connection
· Principle: Install quick couplings at the pipe ends to achieve quick connection and disassembly.
· Applicable scenarios: Situations where pipes need to be replaced frequently.
