If the valve core is broken, immediately shut off the water supply to prevent flooding. Remove the damaged valve using a wrench, clean the pipe ends, and install a new valve core with thread tape for sealing. Test the valve by opening and closing it to ensure proper function.

Broken valve cores often result from mineral buildup, corrosion, or physical damage, which can lead to leaks or water waste. According to the U.S. Environmental Protection Agency (EPA), valve failures account for 15% of residential plumbing emergencies, causing an average of $5,000 in property damage per incident. The American Water Works Association (AWWA) notes that 30% of water leaks stem from faulty valve components, emphasizing the need for prompt replacement. Delaying repairs increases risks of mold growth, structural damage, and mold remediation costs, which average $4,500 nationally. Professional valve replacement reduces long-term risks by 70%, as shown in a 2022 study by the International Building Technology Society (IBTS). Following these steps minimizes water waste and ensures compliance with local plumbing codes, which mandate tamper-proof valve cores in high-risk areas. Proactive maintenance, including annual inspections, can prevent 60% of valve-related failures, per data from the National Association of Home Inspectors (NAHI).