ValvesDOE-HDBK-1018/2-93TYPES OF VALVESSummaryThe following important information in this chapter is summarized below.Types of Valves SummaryGate valves are generally used in systems where low flow resistance for a fullyopen valve is desired and there is no need to throttle the flow.Globe valves are used in systems where good throttling characteristics and lowseat leakage are desired and a relatively high head loss in an open valve isacceptable.Ball valves allow quick, quarter turn on-off operation and have poor throttlingcharacteristics.Plug valves are often used to direct flow between several different ports throughuse of a single valve.Diaphragm valves and pinch valves are used in systems where it is desirable forthe entire operating mechanism to be completely isolated from the fluid.Butterfly valves provide significant advantages over other valve designs in weight,space, and cost for large valve applications.Check valves automatically open to allow flow in one direction and seat to preventflow in the reverse direction.A stop check valve is a combination of a lift check valve and a globe valve andincorporates the characteristics of both.Safety/relief valves are used to provide automatic overpressurization protection fora system.Rev. 0ME-04Page 43
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