The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 340
ever P, the steam may be worked expansively at pleasure.Improved spring safety-valves are exhibited by other drawings at-tached to tliis specification, from which it will appear there aretwo forms of construction, showing a valve with a conical-shapedseat, being a flat-valve, and constructed with a… … way in the valve-seat. This valve is weighted by a helical spring,of sufficient power, according to the required pressure of thesteam; and when it is intended to be used as a reserve safety-valve, the spring is to be placed around that part of the stembelow the valve—tliat is to say, within the…
Architecture · Civil engineering · Science
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