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Valves are quite diverse and may be classified into a number types. ==Basic types== Valves can be categorized into the following basic types: * Ball valve, for on/off control without pressure drop, and ideal for quick shut-off, since a 90° turn offers complete shut-off angle, compared to multiple turns required on most manual valves. * Butterfly valve, for flow regulation in large pipe diameters. * Ceramic Disc valve, used mainly in high duty cycle applications or on abrasive fluids. Ceramic disc can also provide Class IV seat leakage * Clapper valve, Used in appliances like the Siamese fire appliance to allow only 1 hose to connected instead of two (the clapper valve blocks the other side from leaking out. * Check valve or non-return valve, allows the fluid to pass in one direction only. * Choke valve, a valve that raises or lowers a solid cylinder which is placed around or inside another cylinder which has holes or slots. Used for high pressure drops found in oil and gas wellheads. * Diaphragm valve, which controls flow by a movement of a diaphragm. Upstream pressure, downstream pressure, or an external source (e.g., pneumatic, hydraulic, etc.) can be used to change the position of the diaphragm. * Gate valve, mainly for on/off control, with low pressure drop. * Globe valve, good for regulating flow. * Knife valve, similar to a gate valve, but usually more compact. Often used for slurries or powders on/off control. * Needle valve for accurate flow control. * Pinch valve, for slurry flow regulation and control. * Piston valve, for regulating fluids that carry solids in suspension. * Plug valve, slim valve for on/off control but with some pressure drop. * Poppet valve, commonly used in piston engines to regulate the fuel mixture intake and exhaust * Spool valve, for hydraulic control * Thermal expansion valve, used in refrigeration and air conditioning systems. * Pressure Reducing Valve * Sampling valves * Safety valve 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of valves」の詳細全文を読む スポンサード リンク
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