Miscellaneous Mechanical ComponentsDOE-HDBK-1018/2-93STEAM TRAPSThe valve is attached to the bellows in such a way that the valve closes when the bellowsexpands. The valve remains closed, trapping steam in the valve body. As the steam cools andcondenses, the bellows cools and contracts, thereby opening the valve and allowing thecondensate to drain.ImpulseSteamTrapImpulse steam traps, illustrated in Figure 19, pass steam and condensate through a strainer beforeentering the trap. 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 principle thathot water under pressure tends to flash into steam when the pressure is reduced.The only moving part in the steam trap is the disk. A flange near the top of the disk acts as aFigure 19 Impulse Steam Trappiston. As demonstrated in Figure 19, the working surface above the flange is larger than theworking surface below the flange. Rev. 0ME-05Page 37
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