To close hot and cold water valves for long service life, follow these steps: shut off the main water supply, close both valves clockwise using the handle, check for leaks, and replace damaged components promptly. For extended durability, avoid forcing the handle and ensure the valve seat is clean before reassembly.

Proper valve closure prevents water hammer, pipe corrosion, and internal erosion, which are primary causes of valve failure. According to the American Water Works Association (AWWA), 30% of valve failures result from improper closure, leading to pipe damage and costly repairs. Residual water trapped in valves accelerates corrosion, with industry studies showing a 40% increase in valve degradation when water remains stagnant. The U.S. Environmental Protection Agency (EPA) reports that maintaining water system integrity through correct valve operation reduces maintenance costs by 25% over 10 years. Additionally, clockwise closure ensures a tight seal by compacting the valve seat, minimizing wear. The International Association of Plumbing and Mechanical Engineers (IAPMO) standards emphasize that 90% of valve longevity depends on correct installation and regular maintenance. For instance, a 2021 study in Journal of Water Resources Management found that valves maintained with proper closure protocols lasted 3–5 times longer than those neglected. Regular inspection every 6 months further extends service life by identifying and addressing minor issues early. In summary, systematic valve closure, paired with proactive maintenance, maximizes lifespan and operational efficiency while reducing environmental and financial impacts.