Safety valve: Difference between revisions
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File:SafetyValve2 BillSheilds.jpg|Figure 2 | File:SafetyValve2 BillSheilds.jpg|Figure 2 | ||
File:SafetyValve3 BillSheilds.jpg|Figure 3 | File:SafetyValve3 BillSheilds.jpg|Figure 3 | ||
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== Greenly Design == | |||
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File:Henry Greenly Northern-Hudson throttle and safety valves.jpg|Safety valve design from Henry Greenly's 1.6 inch scale Northern/Hudson. | |||
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Latest revision as of 11:57, 22 November 2019
Operation
Bill Shields provided this description on Chaski.org:
- Figure 1: The steam running past the ball now puts pressure on the ENTIRE ball, rather than just the 'sealing face'. The discharging steam is contained in an annular ring that keeps the pressure ABOVE atmospheric...how much above is adjustable. This adjustment, combined with the total area of the ball exposed to the now flowing steam, keeps the ball 'up'
- Figure 3: Not all valves have these balls. I personally like valves with more of an industrial poppet type of seat (Figure 2), that is guided both top and bottom...makes me a bit more comfortable...
Figure 1
Figure 2
Figure 3
Greenly Design
Safety valve design from Henry Greenly's 1.6 inch scale Northern/Hudson.
See also
Articles on Safety Valves: