Miscellaneous Mechanical ComponentsDOE-HDBK-1018/2-93STEAM TRAPSAlthough there are several variations of the orifice-type steam trap, each has one thing incommon; it contains no moving parts. One or more restricted passageways or orifices allowcondensate to trickle through, but do not allow steam to flow through. Some orifice-type steamtraps have baffles in addition to orifices.SummaryThe following important information in this chapter is summarized below.Steam Traps SummaryA steam trap consists of a valve and a device or arrangement that causes the valveto open and close as necessary to drain the condensate from the lines withoutallowing the escape of steam. Steam traps are installed at low points in the systemor machinery to be drained.The type of steam trap used depends primarily on its application. Types include ballfloat, bucket traps, thermostatic traps, bellows-type traps, impulse traps, and orifice-type traps.Impulse steam traps pass steam and condensate through a strainer before entering thetrap. A circular baffle keeps the entering steam and condensate from impinging onthe cylinder or on the disk. The impulse type of steam trap is dependent on the factthat hot water under pressure tends to flash into steam when the pressure is reduced.Rev. 0ME-05Page 39
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