To replace a valve core in a water pipe, first shut off the water supply to the valve and drain excess water from the pipe. Use a pipe wrench or valve core removal tool to loosen and remove the old core. Insert the new core into the valve body, ensuring it aligns properly with the pipe threads. Tighten the core using the wrench while maintaining alignment. Finally, restore water flow and test for leaks.

Replacing a valve core is critical to prevent water leaks, system pressure loss, and potential property damage. According to the American Water Works Association (AWWA), undetected valve failures can result in an average of 25,000 gallons of water loss per day, costing households up to $500 annually in utility bills. A 2021 study by the U.S. Environmental Protection Agency (EPA) found that 15% of water main breaks are caused by faulty valve components, emphasizing the need for timely maintenance. Proper installation ensures airtight seals, reducing the risk of cross-connections that may contaminate drinking water. The EPA estimates that correct valve maintenance can prevent 30% of emergency water service disruptions. Additionally, using high-quality valve cores with brass or stainless steel materials, as recommended by the AWWA, extends lifespan by up to 20 years compared to cheaper alternatives. Neglecting this process may lead to costly repairs, as a single undetected leak can cause foundation damage or mold growth, averaging $5,000 in repairs. Regular valve core inspections, as per the AWWA’s guidelines, should occur every 5–7 years to mitigate long-term risks.