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Valves DOE-HDBK-1018/2-93 VALVE FUNCTIONS AND BASIC PARTS VALVE FUNCTIONS AND BASIC PARTS Valves are the most common single piece of equipment found in DOE facilities. Although  there  are  many  types,  shapes,  and  sizes  of  valves,  they  all  have  the same basic parts.   This chapter will review the common parts and functions of a valve. EO  1.1 DESCRIBE   the   four   basic   types   of   flow   control   elements employed  in  valve  design. EO  1.2 DESCRIBE  how  valve  stem  leakage  is controlled. EO  1.3 Given  a  drawing  of  a  valve, IDENTIFY  the  following: a. Body b. Bonnet c. Stem d. Actuator e. Packing f. Seat g. Disk Introduction A valve is a mechanical device that controls the flow of fluid and pressure within a system or process.   A valve controls system or process fluid flow and pressure by performing any of the following functions: Stopping and starting fluid flow Varying (throttling) the amount of fluid flow Controlling the direction of fluid flow Regulating downstream system or process pressure Relieving component or piping over pressure There  are  many  valve  designs  and  types  that  satisfy  one  or  more  of  the  functions  identified above.   A multitude of valve types and designs safely accommodate a wide variety of industrial applications. Regardless of  type, all  valves have  the  following basic  parts: the  body, bonnet,  trim  (internal elements), actuator, and packing.   The basic parts of a valve are illustrated in Figure 1. Rev. 0 ME-04 Page 1


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