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Prev NEXT. Bath and Laundry. Cite This! Print Citation. Try Our Sudoku Puzzles! They have strong similarities to brass plunger-type ball-cocks they also feature a float ball but they have some important differences. One such difference is that these ballcocks are anti-siphon. They can come in a cast brass body or plastic body construction.
Rather than a plunger stem with a washer that seals against the water inlet port, this type of ballcock has a diaphragm seal that opens and closes to control water flow. Plastic body construction is what you find on most newer model anti-siphon diaphragm ballcocks, and is probably what you will buy if you are choosing to replace a ballcock type valve with another ballcock.
Note that this all-plastic type still qualifies as a true ballcock, since its operating mechanism makes use of a float ball. Cast brass construction is found on older models of diaphragm-type ballcocks, such as the Mansfield 07 now discontinued or the Wolverine Model , both of which are anti-siphon.
On an older style diaphragm ballcock, the bonnet or cap is made of cast brass just like the rest of the fill valve body. The button that actuates the diaphragm is plastic, however.
Today, brass models are typically replaced with modern plastic models. This type is identified by a plastic floating O-shaped cup that moves up and down around the fill valve shaft. The floating cup is attached using a metal spring clipped to a metal actuating rod.
Water level in the tank is controlled by adjusting where the actuating rod connects to the float cup. This is a very popular and easy to maintain fill-valve style. This design accounts for the vast majority of toilet fill valves sold, and it is often the replacement of choice when it comes time to replace an older plunger- or diaphragm-style ballcock unit. Many styles have adjustable shafts, allowing the fill valve to be adjusted up or down to fit different toilet tank depths.
At this stage in the evolution of toilet fill valves, the device no longer qualifies as a true ballcock, since the floating ball has now been replaced by a different mechanism. To this day, though, toilet fill valves of all types are often referred to as ballcocks.
Generally, this ballcock serves as the replacement for more traditional brass and plastic ballcocks with float balls. This type of fill valve has a replaceable and accessible washer, which makes repairs easier.
The floatless fill valve is made of plastic and is a newer innovation in anti-siphon fill valves. These fill valves use a diaphragm pressure-sensing mechanism rather than any kind of float device to control the inlet valve.
Many professional plumbers avoid them in favor of float-cup fill valves. You will find these valves attached to the bottom of the tank, since they operate underwater. Actively scan device characteristics for identification.
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