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Cold Water Loft Tank Float Valve Ballcock Fault

The obvious cause of my overflowing cold water loft tank..

 

The big red ball should be attached to the float arm.. but it isn't.

 

Therefore the arm is in the dropped position so the valve is open and water continues to fill the tank without any means of a cut off. Subsequently this excess water will now discharge through the overflow pipe which is how I became aware of a problem.

 

Incredibly the ball was attached to the arm via a plastic retainer rather than screwed on with a far more durable brass thread thingy if you know what I mean. Having said that this float valve ball has lasted 33 years so it hasn't done too badly.

 

The plastic retainer has sheared off from the ball and is unrepairable so the whole lot will need to be replaced.

 

The plumbing parts required are not expensive and are not particularly difficult to fit either. The biggest problem is access to and movement within the loft.

 

The overflowing end result of this broken float valve flic.kr/p/2jaBnBx

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Uploaded on June 10, 2020
Taken on June 10, 2020