Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 152
Fig. 5Gsquare feet of grate surface in the boiler, and the seats ofall such safety valves shall have an angle of inclination of45° to the center line of their axis/^ Boiler Setting and Equipment … Fig. 57inside view of a pop safety valve In order to arrive at accurate results in lever safetyvalve calculations it is necessary to know first the numberof pounds pressure exerted upon the stem of the valve by 140 Steam Engineering the lever itself, irrespective of the weighty also the weightof…
