Given that the current airtightness testing of most valves (such as gas valves, toxic gas valves, etc.) mainly relies on traditional water testing methods. By injecting high-pressure gas and placing it in a water tank, maintaining pressure for 30-60 seconds, the valve can be visually judged for leakage (bubbles), which is relatively labor-intensive for workers and can easily result in serious consequences* 1. Hard indicators (such as specific parameters, which can be adjusted according to actual conditions) can be achieved using reliable precision components and control components to achieve a medium pressure gas of 3MPa, holding pressure for 60 seconds, equivalent to no small bubbles in water leakage, and a low-pressure gas of 0.1MPa, holding pressure for 60 seconds, equivalent to no small bubbles in water leakage. No need for helium testing, the cost is too high, unless the gas can be recovered. 2. Selective indicators (such as indicators within an acceptable cost range, which can be adjusted according to the actual situation), the cost per set is not more than 10000 yuan