On locomotive and marine boilers, where shocks and movements have to be reckoned with, weights are replaced by springs, set to a certain tension, and locked up so that they cannot be tampered with. Fig. 11.—A
On locomotive and marine boilers, where shocks and movements have to be reckoned with, weights are replaced by springs, set to a certain tension, and locked up so that they cannot be tampered with. Fig. 11.—A Lever Safety-Valve. V, valve; S, seating; P, pin; L, lever; F, ...