. The street railway review . FIG. y6—(A4-8). figure is much preferable to detail A4-6 as it permits the governorto be readily disconnected while the pump is running, and at thesame time leaves the pipe work perfectly supported, which is notthe case with detail A4-5. The by-pass shown in detail A4-10,indicated by the letter a, is virtually three valves attached to theone valve body. The diaphragm and tension spring are both pro-tected from high temperature by the condensation and pump waterin the lower part of the regulator. The lower tube is made ofbrass to aid in conducting heat away from th
. The street railway review . FIG. y6—(A4-8). figure is much preferable to detail A4-6 as it permits the governorto be readily disconnected while the pump is running, and at thesame time leaves the pipe work perfectly supported, which is notthe case with detail A4-5. The by-pass shown in detail A4-10,indicated by the letter a, is virtually three valves attached to theone valve body. The diaphragm and tension spring are both pro-tected from high temperature by the condensation and pump waterin the lower part of the regulator. The lower tube is made ofbrass to aid in conducting heat away from the condensation. This. FIG. 98—(A4-10). governor covers the requirements for boiler feed pumps in allparticulars, and in selecting a governor for this purpose, thesedifferent features should be considered. The tension spring has anut attached at each end, the upper end being made fast to thevalve stem. The hand screw engages with the lower nut, and for boiler feeding would put a tension on the spring. If lowerw^atcr than steam pressure is required, then the spring would beplaced imdcr compression. For example, if 60 lb. pressure wasrequired, and the Ixjiler pressure was 120 lb., then the spring wouldbe loaded so that the water pressure would be 60 lb. less than theboiler pressure. If a fire pump is to be used for a feed pump also,this governor, detail A4-10, is preferable to the devices shown indetail 1.^4-7, with stuffing boxes, pistons, etc. The latter is moreinferior as a feed pump governor than A4-10 is as a fire pumpgovernor. Fire pump governors cannot be made without at least one stuflF-ing box at t
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
