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When electric three-way ball valves are in use, certain problems may arise. Some users have reported that the valves do not close properly. Today, we will provide a detailed analysis of the reasons why three-way ball valves fail to close tightly, as well as the solutions to these issues. 1. Rust on the valve stem threads can cause electric three-way ball valves, which are usually in the open position, to fail to close properly when closed occasionally, as the rust on the valve stem threads prevents a tight seal. In such cases, the electric valve can be turned on and off several times, while simultaneously tapping the bottom of the valve body with a small hammer; this will ensure that the valve closes properly, without the need to grind or repair it. 2. If the sealing surface of the three-way ball valve is damaged, and it still cannot be sealed properly even after attempting to open and close it multiple times, then the sealing surface is damaged and repair should be requested ； Or if corrosion, scratches caused by particles in the medium, etc., have damaged the sealing surface, it should also be reported for repair. 3. Impurities may get stuck in the sealing surface of the electric ball valve, causing the valve to fail to close properly at times. This could be due to impurities trapped between the sealing surfaces of the electric valve; in such cases, one should not try to force it closed. Instead, the valve should be opened slightly more before attempting to close it again. Repeating this process usually resolves the issue. If it doesn’t, an inspection is necessary, and it’s important to ensure that the quality of the fluid is clean. 4. The connection between the valve stem and the valve disc is not proper; it is necessary to apply lubricant to the valve stem and its nut of the three-way ball valve regularly to ensure smooth operation of the electric ball valve. A proper maintenance plan is required.