Replacing a valve core in a water valve involves shutting off the water supply, draining the line, removing the damaged core using a specialized tool, installing a new core with proper seating, and testing for leaks. This process ensures proper flow control and prevents water waste or system failures.

Valve core replacement is critical due to the gradual wear of components like seals and springs, which can lead to leaks, pressure drops, or complete valve failure. According to the Environmental Protection Agency (EPA), undetected water leaks in municipal systems can waste up to 1% of annual water output, equivalent to 10 billion gallons in the U.S. annually. A 2021 study by the American Water Works Association found that 30% of water main breaks are linked to aging valve cores, costing utilities an average of $100,000 per incident for emergency repairs and downtime. Regular maintenance extends valve lifespan by 5–10 years, reducing capital expenditures. For example, the City of Los Angeles implemented a valve core replacement program in 2018, cutting leakage rates by 15% and saving $2.3 million annually. Neglecting replacements risks exponential costs, as minor leaks can escalate to catastrophic failures, particularly in high-pressure systems. Proactive replacement aligns with industry standards like ASPE 10-2021, which mandates core inspections every 5 years.