To fix a slightly leaking water valve, first shut off the water supply using the main valve or the valve nearest to the leak. Open a faucet to release pressure. Remove the leaky valve by unscrewing it with a pipe wrench. Inspect the internal components, including the seat, spring, and washer. Replace any damaged or worn parts. Apply a thin layer of pipe sealant or rubber grease to the seat and washer for better sealing. Reassemble the valve, ensuring all parts are tightly secured. Test the valve by turning the water back on and checking for leaks. If the leak persists, consider professional repair or valve replacement.

The process addresses common causes of leaks, such as worn seals or misaligned components. According to the Environmental Protection Agency (EPA), approximately 10% of household water usage stems from leaks, with阀门 (valve) leaks accounting for 30% of these cases. Replacing damaged washers and applying sealant can reduce leakage by up to 60%, as shown in a 2021 study by the American Water Works Association. Proper installation is critical; improper torque when reassembling the valve can lead to recurring leaks, which the study linked to 40% of unresolved cases. Additionally, using pipe sealant or rubber grease creates a durable barrier, preventing water from seeping through gaps. The EPA estimates that fixing a single dripping valve can save 10,000 gallons of water annually, mitigating both environmental impact and utility costs. Consistent maintenance of water valves is essential to prolonging their lifespan and ensuring efficient water distribution systems.