tailieunhanh - Mechanical Science HandbooksMechanical Science Handbooks 20000 Part 10

Tham khảo tài liệu 'mechanical science handbooksmechanical science handbooks 20000 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | STEAM TRAPS DOE-HDBK-1018 2-93 Miscellaneous Mechanical Components Bucket Steam Trap A bucket steam trap is illustrated in Figure 17. As condensate enters the trap body the bucket floats. The valve is connected to the bucket in such a way that the valve closes as the bucket rises. As condensate continues to flow into the trap body the valve remains closed until the bucket is full. When the bucket is full it sinks and thus opens the valve. The valve remains open until enough condensate has passed out to allow the bucket to float and closing the valve. Figure 17 Bucket Steam Trap Thermostatic Steam Traps There are several kinds of thermostatic steam traps in use. In general these traps are more compact and have fewer moving parts than most mechanical steam traps. Bellows-Type Steam Trap A bellows-type steam trap is illustrated in Figure 18. The operation of this trap is controlled by the expansion of the vapor of a volatile liquid which is enclosed in a bellows-type element. Steam enters the trap body and heats the volatile liquid in the sealed bellows causing expansion of the bellows. Figure 18 Bellows-Type Steam Trap ME-05 Page 36 Rev. 0 Miscellaneous Mechanical Components DOE-HDBK-1018 2-93 STEAM TRAPS The valve is attached to the bellows in such a way that the valve closes when the bellows expands. The valve remains closed trapping steam in the valve body. As the steam cools and condenses the bellows cools and contracts thereby opening the valve and allowing the condensate to drain. Impulse Steam Trap Impulse steam traps illustrated in Figure 19 pass steam and condensate through a strainer before entering the trap. A circular baffle keeps the entering steam and condensate from impinging on the cylinder or on the disk. The impulse type of steam trap is dependent on the principle that hot water under pressure tends to flash into steam when the pressure is reduced. Figure 19 Impulse Steam Trap The only moving part in the steam trap is the disk. A flange near the top