What is the working principle of PVC pipes? What are the differences between the various types of PVC pipes?

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2026-10-08 16:26:33.633

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The functionality of PVC pipes relies on the physical properties of the polyvinyl chloride material:

- **PVC Water Supply Pipes:** These utilize smooth inner walls to minimize flow resistance and maintain stable water pressure, while dense outer walls block corrosive substances found in soil and moisture. Sealed joints prevent leakage, ensuring the stable transport of pressurized fluids. Typical pressure ratings range from 1.0 to 2.5 MPa.
- **PVC Electrical Conduits:** These leverage the material's insulating properties to electrically isolate cables from walls and soil, thereby preventing leakage risks. Their rigid structure withstands external compression, protecting the cable's insulation layer.
- **Flexible PVC Pipes:** Formulated with a higher content of plasticizers, these are soft and pliable, making them suitable for applications requiring flexibility, such as small-scale water transport or equipment sheathing.
**Key Differences:** Water supply pipes have thicker walls (2.0–10 mm) and must meet hygiene standards for potable water; electrical conduits have thinner walls (1.2–2.0 mm) and do not require potable water certification. The two types are not interchangeable. **Common Misconceptions:** ① Not all PVC pipes are suitable for transporting drinking water; only water supply pipes meeting the GB/T 10002.1 standard qualify. ② PVC pipes are unsuitable for the long-term transport of hot water exceeding 45°C, though they can have a service life of over 50 years when used at ambient temperatures.