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Sleeve valve (water)
A sleeve valve is a device typically used in a water supply or distribution system when there is a need to reduce high pressure or throttle flow. The sleeve valve consists of a cylindrical gate (tube) which slides over an inner sleeve. The inner sleeve was consists of a series of nozzles specifically sized and arranged to provide a solution to cavitation issues frequently encountered in throttling applications with other valve types. Because of its design, it minimizes cavitation. Cavitation that does occur in severe throttling conditions is directed from the valve down to center of the valve or pipe so that no erosion damage to the piping can take place.
==Types==
There are three main types of sleeve valves: inline, angle pattern and downflow pattern. Inline sleeve valve can be installed in the pipeline or at the end of the pipeline for free discharge. Inline sleeve valve have an inlet section which allows upstream media to flow into an outer annular area. The flow then takes a 90° turn through the sleeve and collides with flow from the opposite side dissipating the energy. The flow then travels downstream through an exit spool on the downstream end. The angle pattern sleeve valve is installed at a 90° bend in place of an elbow. Angle pattern sleeve valves employ a similar design as the inline sleeve valve by creating an outer annular area to contain the media and a sleeve with tapered nozzles to pass the flow. The difference is that the flow direction after passing through the sleeve changes by 90°. Downflow pattern sleeve valves are installed at the end of a pipeline and discharge into sumps, reservoirs, stilling wells or tanks. Unlike inline and angle pattern the discharge of a downflow pattern is outward and is not contained by the valve itself.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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