Replacing the valve core of a stop valve involves several critical steps. First, shut off the water supply to the valve and drain the system to eliminate pressure. Use a pipe wrench to loosen and remove the supply lines connecting the valve. Next, carefully unscrew the valve body from the pipe, ensuring not to damage the threads. Once the body is removed, extract the old valve core using a specialized tool or pliers, avoiding excessive force to prevent thread stripping. Insert the new core into the valve body, ensuring it aligns correctly with the seats. Reassemble the valve by tightening the body back onto the pipe, reconnect the supply lines, and restore water pressure. Test the valve by opening it fully to confirm proper operation. Always use high-quality replacement parts to maintain durability and functionality.

The valve core is a critical component that controls water flow and prevents leaks. A faulty core can lead to water waste, increased utility bills, and potential property damage. According to the U.S. Environmental Protection Agency (EPA), non-functional valves account for 10% of household water leaks, costing homeowners an average of $200 annually in excess water usage. Additionally, the American Water Works Association (AWWA) reports that 15% of water main failures in aging infrastructure are linked to valve core failures, highlighting the importance of timely maintenance. Replacing the core promptly ensures optimal pressure regulation, reduces energy consumption from pump inefficiencies, and extends the valve’s lifespan. Proactive replacement prevents costly emergency repairs, with the average cost of a valve replacement ranging from $150 to $500, depending on complexity. Neglecting this task can escalate into system-wide failures, risking property damage and water service disruptions. Regular valve inspections and replacements align with industry standards for maintaining water distribution systems, as outlined by the AWWA’s manual M28. This process safeguards infrastructure integrity and public health by mitigating contamination risks from leaks.