I want to fit a new valve and float to the toilet cistern in the bathroom and cannot isolate the water supply.
The cistern is fed via a gate valve from the storage tank in the loft. With the valve fully closed and all sink and bath taps open there is little reduction in the flow of water. It IS the correct valve, and all other cold feeds are dead ends i.e. showers, central heating and hot water cylinder. And, no, it is a modern house and is certainly not directly fed!
I know I can do the job by draining the storage tank or using Arctic Spray, but it bugs me! Why will the flow of water not stop? Any ideas out there?
The cistern is fed via a gate valve from the storage tank in the loft. With the valve fully closed and all sink and bath taps open there is little reduction in the flow of water. It IS the correct valve, and all other cold feeds are dead ends i.e. showers, central heating and hot water cylinder. And, no, it is a modern house and is certainly not directly fed!
I know I can do the job by draining the storage tank or using Arctic Spray, but it bugs me! Why will the flow of water not stop? Any ideas out there?