Replacing the valve core in a face basin faucet involves disassembling the faucet, removing the damaged core, and installing a new one. First, shut off the water supply and open a nearby tap to drain residual water. Use a wrench or pliers to loosen the faucet handle and disassemble it according to the manufacturer’s instructions. Once the base is exposed, locate the valve stem and gently twist or pull out the old valve core. Clean the seat with a seat wrench or a specialized tool to remove debris. Insert the new valve core, ensuring it seats properly, and tighten it securely. Reassemble the faucet in reverse order, test for leaks, and restore water flow.

Valve core replacement is critical because worn cores cause leaks, water waste, and reduced pressure. According to the Environmental Protection Agency (EPA), leaks in household fixtures can waste hundreds of gallons of water annually, emphasizing the need for timely maintenance. A 2021 study by the American Water Works Association found that 40% of faucet failures stem from faulty valve cores, which degrade due to mineral buildup, corrosion, or mechanical wear. Replacing the core is cost-effective, typically costing less than $20, compared to $100–$300 for full faucet replacement. Additionally, a well-maintained valve core can last 10–15 years, per industry benchmarks, making it a sustainable choice. Neglecting this repair can lead to higher utility bills and property damage, underscoring the importance of proactive upkeep.