What should I do if the tap water valve always leaks?

Replace the hoses and eight-character valves produced by regular manufacturers. Another way is to turn off the main water pipe door, and when the splayed valve and plastic pipe are dry, use' AB' glue (also called Geliahao) instead of raw tape, and then tighten them. It won't leak when the glue solidifies. You can do it first and then adopt mine when the effect is good.