Section 33, The Machinery (Safe Working Citation

(1) Safety-valves shall be so constructed that the valve ~ns}.r~ctioncan easily be freed from its seat at any time, and satisfactory ~af:e:. yprovision shall be made to prevent the valves flying off in the case of the spring or lever breaking or by the load being removed suddenly in any way by accident or other cause. (2) Safety-valves loaded by a weight or spring acting on a lever shall be so constructed that the load acts only upon the extreme end of the lever. When safety-valves are loaded directly by springs, the compressing screws shall abut against metal stops or washers, at the working load compression. (3) The spring shall have a sufficient number of coils to allow of a compression under the working load of at least one-quarter the diameter of the valve. 1852 Cap. 218] · Machinery (Safe Working & Inspection) Load of safetyvalves. Low water contrivances. Pressure gauges. Test gauge contrivances. (4) In the case of a boiler of a locomotive or locomobile, safety-valves shall be spring-loaded; in the case of a boiler which is ordinarily stationary when in use, at least one safetyvalve shall be loaded by weight, acting direct or with leverage, unless the pressure exceeds ISO lb. per square inch.