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ball cock

A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by José Antonio de Alzate y Ramírez, a Mexican priest and scientist, who described the device in 1790 in the Gaceta de Literatura Méxicana. The ballcock device was patented in 1797 for use in steam engines by Edmund Cartwright.It consists of a valve connected to a hollow, sealed float by means of a lever mounted near the top of the tank. The float is often ball-shaped, hence the name ballcock. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control.

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  1. I

    Ballcock valve needing replaced

    Hi, I've just bought a house and the overflow pipe from cold water tank was running. So I am trying to replace the ball cock mechanism. I bought what I thought was the right one from b&q - but the thread was too small. So I now have the valve off, and will take it to b&q tomorrow to look for...
  2. N

    What is the blank at the ball cock for?

    Been a plumber for many years and nine times out of ten when changing a ball cock at a tank there is a tee rather than a bend, the tee then has a blank at the end. Anyone know why this is? I am always just taking the tee out and putting a bend on because it is simpler but the more I see this the...
    • Nwalky
    • Thread
    • america attic tank ball cock blank usa
    • Replies: 4
    • Forum: USA
  3. SMB

    Ball cock rubber washer replacement.

    sorry if this has been asked before, searched but could not find the answer. Not too good on computers! I need to replace the large rubber washer in the ball valve. Which way does it go round into the fitting where it buts up to the white flow cone. Cheers.
  4. A

    Water Tank Overflowing but not ball cock

    Hi, I have a problem and would be grateful for any help. At the weekend, when filling up the bath, the overflow pipe from the roof started chucking out water. I have one tank in the loft. I have changed the ball cock already but have realised this isn't what's causing the overflow. When...
  5. C

    Ball cock Valve in the water tank?

    Hi there, Just looking for some confirmation. I replaced a plastic part which looked a little worn in my cistern 2weeks ago as my toilet tank was not filing up after flushing(squirting out - not opening/closing) but in the last few days the cold water pipe at times, makes vibration sounds...
  6. M

    toilet ball cock

    any way to reattach to arm if broken off?
  7. W

    I've a dripping ball cock and a blocked manhole.

    Could these be connected?
  8. L

    Dripping Ball Cock

    Hi Over the past few weeks my overflow pipe is dripping in my alley way. I have looked at the small water cictern in the airing cupboard and the water is right at the top. I keep emptying water out of the tank but is quickly fills up and overflows again. The ball cock water valve does drip even...
  9. D

    water tank overflows not ball cock or split coil in cylinder

    I have a problem with water flowing out of my overflow pipe. Ball cock is not the problem as i have isolated it. The exess water only flows when the hot water comes on (not radiators just hot water), it comeing in from the bottom pipe in the tank (the one that should fill the system) and the...
    • dannyabb
    • Thread
    • ball cock cold cold water cylinder dhw drain header header tank heating hose hot water leak leaking mixer oil overflow pipe pipe problem radiators remove shower split supply system tank valve water water tank
    • Replies: 14
    • Forum: Plumbing Jobs | The Job-board
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