REPAIRING A CHECK VALVE - If the spring mechanism in a Check Valve is weak or broken, you will have to replace it. Unfortunately, not all Check Valve can be repaired. The Spring Check Valves discussed above cannot be opened for repair.so they must be replaced. On a Spring Flapper style Check Valve, the Flapper mechanism can be accessed and replaced through the top of the valve. See "How To Repair a Pool Spring Flapper Check Valve
". for further instructions.