Improvements in Relief or Back Pressure Valves
12,854. Thompson, W. P., [Foster Engineering Co.]. June 20. Safety-valves.-A relief or back-pressure dishshaped valve 8 is normally held, by a spring 19, against its seat 14 on an annular bronze or other non-corrosive web 3, secured between the two casings 1, 2. The compression of the spring 19 is a...
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