SAFETY-VALVE
\sˈe͡ɪftivˈalv], \sˈeɪftivˈalv], \s_ˈeɪ_f_t_i_v_ˈa_l_v]\
Definitions of SAFETY-VALVE
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A valve in the boiler of a steam-engine: (1) external, held down by a regulated force so as to open when the steam pressure exceeds a certain amount, and thus both relieve the pressure and give notice to the engine-man; (2) internal, to relieve the pressure of the external air by letting in air when the cooling of the steam produces a vacuum within the boiler.
By Henry Percy Smith
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