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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
t locomotive-engine, offered by the Liverpool and Manchester Railway Company, and won by Stephenson's Rocket, it was stated that one of the safety-valves should be locked up. See also lock-up safety-valve. Lock — up safety-valve. A British form of the lock-up safety-valve, which is inaccessible to the engineer, except to lift it to ascertain that it is not set fast, is shown in the illustration (Fig. 4544). Fig. 4545 shows two other forms of safety-valves for steamboilers; one from Burch's work on Steam-boilers ; the lower one is Cameron's valve. In Fig. 4546, the lever and weight are toothed on their under surfaces, engaging the teeth of a spur-wheel, to whose axis an index is attached which indicates on a dial the steam pressure at which the safety-valve is set. Fig. 4547 is a safetyvalve, or blow-off valve; operated in the latter case by a stem passing through a stuffing-box in the front of the boiler. Safety-valves. Safety-valve. Safe′ty-valve Le′ver. <