Duarde 3912377

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The first screw-down tap mechanism was patented and manufactured by the Rotherham brass founders Guest and Chrimes 1845. Most older taps use a soft rubber or neoprene washer which is screwed on the valve seat to stop the flow. [http://www.duarde.com/es/ toilets] This is called a "globe valve" in engineering and, while it provides a tight seal and good fine adjustment of flow, both the rubber washer and the valve seat are subject to wear (and for the seat, also corrosion) over time, so that eventually no tight seal is formed in the closed position, resulting in a leaky tap. The washer can be replaced and the valve seat resurfaced (at least a couple of times), but globe valves are never maintenance-free.
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Even the water the tortuous S-shaped path is forced to follow offers a significant barrier to flow. Excessive pressure TAP WATER this does not matter, but for low pressure systems where flow rate is important, such as a shower fed by a storage tank, a "stop tap" or, in technical terms, a "shut-off valve" is preferred.
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Gate valves use a metal disc with the same diameter as the tube is screwed into place perpendicular to the flow, cutting it. There is no resistance to flow when the tap is fully open, but this type of tap rarely gives a perfect seal when closed. In the UK this type of tap normally has a wheel-shaped handle rather than a crutch or capstan handle.


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