About ball valve leakage 5×10-12m³/(s·bar·mm)

It is very difficult for a soft-sealing ball valve to achieve a leakage volume of 5×10-12 m³/(s·bar·mm). Conventional PTFE or reinforced PTFE valve seats can usually only meet the zero leakage standard of API 598 or API 6D when leaving the factory (corresponding leakage is about 10⁻⁶ ~ 10⁻⁷ level), which is a difference of nearly 5 to 6 orders of magnitude. Even if ultra-finished processing or special sealing materials (such as PEEK, metal valve seats) are used, it is difficult to achieve this indicator stably. It is usually necessary to select a special low-leakage valve (such as a metal-sealed ball valve or bellows-sealed valve under low-temperature/high-pressure conditions). You'd better first confirm the test standard corresponding to this leakage amount (such as ISO 5208 level A? Or specific working conditions, pressure difference and caliber). In addition, actual usage conditions such as medium and temperature must also be considered. It is recommended to directly consult the valve manufacturer to provide experimental data. The empirical values ​​found online are for reference only.