How to choose the PPR ball valve model suitable for pipe diameter and purpose?

Determine the appropriate nominal diameter
The diameter of the PPR ball valve is usually measured in nominal diameter (DN), and common specifications include DN20, DN25, DN32, DN40, etc. For daily household water use such as washbasins and toilets, DN20 or DN25 is often used; central water supply pipes and hot water mains may use DN32 or above. When selecting, ensure that it is consistent with the diameter of the connected PPR pipe to avoid affecting the smooth flow of water or the risk of leakage.

Pay attention to the pressure rating (PN) of the ball valve
The pressure rating of the PPR ball valve determines whether it can operate stably under different pressure systems. Generally, the two most common models are PN10 and PN16. PN10 is suitable for general household cold water systems; PN16 can be used for hot water or systems with certain pressure fluctuations. Industrial or special equipment may require higher pressure rating support. When selecting a model, the maximum pressure of the system during operation should be verified to avoid leakage or structural deformation during use.

Determine whether the pipeline system requires internal thread or hot melt connection
There are two main ways to connect PPR ball valves: hot melt and threaded. Hot-melt connections are usually used for permanent installations between plastic pipes, suitable for home or long-term use projects. Threaded connections are used for systems that require disassembly and maintenance with high frequency, such as some equipment connections or temporary systems. Choosing the appropriate connection method according to the installation environment and frequency of use can reduce the inconvenience caused by later replacement.

Special uses require additional performance considerations
Some application environments such as chemical plants or high-temperature areas may have additional requirements for PPR ball valves, such as corrosion resistance, high temperature resistance, and UV aging treatment. Although most standard PPR ball valves can meet household use, when facing corrosive liquids or high-frequency opening and closing requirements, it is more appropriate to choose models with special coatings or thickened designs.

Check the implementation standards and manufacturer qualifications
There are many types of PPR ball valves on the market, and the quality varies. In the purchase process, products that meet national or industry standards (such as GB/T 18742) should be given priority, and the manufacturer should be checked to see if it has a quality inspection report or production qualification. Some regular manufacturers will mark the nominal pressure, nominal diameter, material grade and other information on the product body to help users determine whether the model matches the actual needs.

Leave appropriate redundancy to improve system stability
In pipeline design, in order to cope with water hammer, temperature changes or system fluctuations, appropriately selecting a slightly larger PPR ball valve can enhance stability. For example, if the system theoretically requires a DN20 model, consider using DN25 to increase the flow margin. However, it should be noted that after the pipe diameter is enlarged, other components must also be adjusted accordingly to avoid mismatching interface sizes.