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Valves stop (or regulate) the flow of liquids or gases. They are categorized by application, such as isolation, throttling, and non-return. Isolation valves temporarily disconnect part of a piping system to allow maintenance or repair, for example. Isolation valves are typically left in either a fully open or closed position.
However, the original 1906 design has proven so reliable that as of 2012, parts are still available to repair any flushometer ever made. [1] Contemporary (2023) Sloan motion sensor flushometer. In addition to its flush valves based on diaphragm technology, Sloan also introduced piston-type flushometers, including the Crown and the GEM 2.
A narrow passageway leads from the main water supply into the pressure chamber. It is the narrowness of this passage that meters the flow by slowing repressurizing of the pressure chamber after the action of a flush. The diaphragm technology allows the flush valve to open and let water into the bowl. A main cylinder valve operates up and down.
In North America, newer toilets have a 3 in (76 mm) flapper-flush valve. Older toilets have a 2 in (51 mm) flapper-flush valve. [7] The larger flapper-flush valve is used on toilets that use less water, such as 1.6 US gal (6.1 L) per flush. Some have a bell inlet for a faster more effective flush.
Galvanized steel potable water supply and distribution pipes are commonly found with nominal pipe sizes from 3 ⁄ 8 inch (9.5 mm) to 2 inches (51 mm). It is rarely used today for new construction residential plumbing.
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