I am looking for advice on a problem I have with my 50 Gallon cold water storage tank which regularly overflows.
Previously the ball valve was a Torbeck Diaphragm Valve but it kept getting grit in it and overflowing. I have therefore changed this to a good quality brass float valve with a plastic float.
However after a period of days the water level rises and the overflow drips continuously until you run off water.
I think the issue might be the overflow. Inside the tank is a plastic elbow type fitting (almost like a Bylaw 30 kit but not), that extends approximately 100mm down into the tank.
I think what might be happing is that when the water rises it create a siphon and the water then siphons out of the tank via the overflow. As the water level drops the valve opens and more water comes in so the process continues until a toilet is flushed or hot water run off which breaks the vacuum.
I have tried bending the brass lever to lower the water level slightly but will I be safe in drilling a small hole in the plastic elbow so that it lets in air and breaks the vacuum so preventing the siphon? If the water does rise due to failure of the valve it will still run out the overflow.
Any thoughts would be appreciated.
Previously the ball valve was a Torbeck Diaphragm Valve but it kept getting grit in it and overflowing. I have therefore changed this to a good quality brass float valve with a plastic float.
However after a period of days the water level rises and the overflow drips continuously until you run off water.
I think the issue might be the overflow. Inside the tank is a plastic elbow type fitting (almost like a Bylaw 30 kit but not), that extends approximately 100mm down into the tank.
I think what might be happing is that when the water rises it create a siphon and the water then siphons out of the tank via the overflow. As the water level drops the valve opens and more water comes in so the process continues until a toilet is flushed or hot water run off which breaks the vacuum.
I have tried bending the brass lever to lower the water level slightly but will I be safe in drilling a small hole in the plastic elbow so that it lets in air and breaks the vacuum so preventing the siphon? If the water does rise due to failure of the valve it will still run out the overflow.
Any thoughts would be appreciated.