Hello, please specify the exact specifications of the valve, as the PN pressure for butterfly valves varies depending on their specifications. The maximum nominal pressure for CPVC materials is PN16, but butterfly valves generally cannot achieve this. Regarding the testing standards in our company, for diameters below DN200, the standard is generally PN10; for DN250–DN400, it is PN6; for DN450–DN600, it is PN3.5; and for DN700–DN800, it is generally PN1. These standards are basically consistent with those used by foreign companies such as SAFI and ASAHI. The reason why the pressure cannot reach the maximum nominal pressure is that the rubber seal deforms easily under high pressure. For sizes below DN100, it may be possible to achieve PN16 through processing adjustments; we can provide a custom tight fit for you, but the torque will be relatively high. It is worth noting that since the strength of plastics changes significantly with temperature, the actual pressure they can withstand decreases as the temperature rises; our test results show that the nominal pressure of CPVC remains relatively stable below 60°C. If you’re still not clear, you can add me on QQ: 544547918. If you want to make a purchase, you can search for BaoTi plastic valves and then get in touch with the sales representative. I’m in the technical department; I can also help you make the transfer. In terms of technical level, variety range, and market share, we are undoubtedly the best in the country.