PE water pipe fittings are indispensable connection components in HDPE pipe systems, mainly used for diversion, diversion, diameter reduction and terminal treatment of PE water supply pipes. With the widespread application of HDPE pipes in water supply systems, PE pipe fittings have become the preferred connection solution for modern water supply projects due to their excellent performance and convenient installation methods.
Main types of PE water pipe fittings
1. Classification by function
| Type | Function | Common Varieties |
| Coupling Fittings | Straight pipeline connection | Coupler, Flange Adapter |
| Branch Fittings | Flow division/convergence | Tee, Cross, Lateral Tee |
| Directional Fittings | Change flow direction | 90° Elbow, 45° Elbow |
| Reducing Fittings | Connect different diameters | Reducer Coupling, Reducing Tee |
| End Cap Fittings | Pipeline termination | Pipe Cap, Plug |
| Repair Fittings | Pipeline restoration | Repair Clamp, Union Joint |
2. Classification by connection method
Hot-melt pipe fittings: permanent connection achieved through hot-melt welding
Electro-melt pipe fittings: built-in electric heating wire, connection achieved through electric heating
Mechanical pipe fittings: mechanical connection through threads, clamps, etc.
Flange pipe fittings: used in conjunction with flanges for easy disassembly
Core advantages
1. Excellent physical properties
Strong corrosion resistance, not corroded by chemicals in soil and water
Good impact resistance, can withstand water hammer impact
Resistant to low temperature (still flexible at -60℃)
2. Excellent hygienic performance
Conforms to GB/T 17219 drinking water hygiene standard
Does not breed bacteria, smooth inner wall without scaling
No risk of heavy metal precipitation
3. Convenient construction characteristics
Hot-melt connection forms an overall structure, no leakage risk
Light weight, easy transportation and installation
No special tools required (basic hot-melt equipment can be used for construction)
4. Long service life
Designed service life of more than 50 years
Ultraviolet resistance (black PE pipe fittings contain 2.5% carbon black protective layer)
Maintenance-free, greatly reducing later costs
Key points for selecting PE water pipe fittings
1. Material selection standards
PE80: Applicable to medium and low pressure water supply systems (≤1.0MPa)
PE100: High strength, suitable for high pressure trunk pipes (≤1.6MPa)
UV-resistant type: For ground installation, pipe fittings containing carbon black layer must be selected
2. Pressure level matching
| SDR Value | Nominal Pressure (PN) | Application Scenarios |
| SDR11 | PN1.6 | Main pipelines, high-pressure water supply |
| SDR13.6 | PN1.25 | General municipal water supply |
| SDR17 | PN1.0 | Residential distribution networks |
3. Key purchasing indicators
Check product identification (specifications, materials, production standards)
Check appearance (no bubbles, dents, impurities)
Confirm certification (GB/T 13663, ISO 4427, etc.)
Prefer one-piece pipe fittings (avoid spliced products)
Installation Specifications
1. Hot-melt connection steps
Cutting preparation: Use a special cutter to ensure a smooth cut
Cleaning: Remove oxides from the contact surface of pipes and fittings
Heating and welding: Set the appropriate temperature according to the pipe diameter (usually 210±10℃)
Butt pressure: Maintain pressure until cooling and forming (time refers to the table below)
| Pipe Diameter (mm) | Heating Time (s) | Transition Time (s) | Cooling Time (min) |
| 63 | 30-40 | ≤5 | 3-5 |
| 110 | 40-50 | ≤5 | 5-8 |
| 160 | 50-60 | ≤6 | 8-10 |
2. Installation precautions
Avoid construction in an environment below 5℃ (insulation measures must be taken)
Pipes and fittings of different SDR series must not be mixed
Pressure testing must not be performed within 24 hours after hot melting
Pipe clamps must be set for ground installation (spacing is 1.5 times the reference pipe diameter)
Frequently Asked Questions
Q: Can PE pipe fittings be directly connected to PVC pipes?
A: No, they must be converted through special transition joints.
Q: How to remedy the failure of hot melting connection?
A: The damaged section needs to be cut, and the repair section or additional pipe fittings need to be used to reconnect.
Q: What is the maximum temperature that PE pipe fittings can withstand?
A: It can reach 95℃ in the short term, but it is recommended to be ≤40℃ for long-term use.
PE water pipe fittings have become the standard configuration of modern water supply systems with their excellent performance and convenient installation methods. Correct selection and standardized installation of PE pipe fittings can not only ensure water supply safety, but also greatly reduce the leakage rate of the pipeline network.
