. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . ke-pipe pressure under the same conditions. Thehigh- or maximum-pressure heads of both types are alike in con-struction and operation. Its general arrangement is illustratedin Fig. 16. The excess-pressure head of the *SF governor has two airconnections. That marked ABV corresponds to the similarconnection of the *SD governor. That marked FVP leads fromthe feed-valve pipe, so that air, at whatever pressure the feed valveis adjusted for, is always present in ch
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . ke-pipe pressure under the same conditions. Thehigh- or maximum-pressure heads of both types are alike in con-struction and operation. Its general arrangement is illustratedin Fig. 16. The excess-pressure head of the *SF governor has two airconnections. That marked ABV corresponds to the similarconnection of the *SD governor. That marked FVP leads fromthe feed-valve pipe, so that air, at whatever pressure the feed valveis adjusted for, is always present in chamber / above diaphragm total pressure on the top of diaphragm 28 is, therefore, thepressure in the feed-valve pipe plus the pressure of spring 27, whichis usually adjusted for 20 pounds. The main-reservoir pressurein chamber d below diaphragm 28 will, therefore, not be able to 30 AIR BRAKES raise the diaphragm and its pin valve, and thus shut off the com-pressor, until it has risen about 20 pounds above the pressuredetermined by the feed-valve setting. Consequently, whether the ExcessPressure Mead 3P ■ Moximum51 Pressure. To Pump Fig. 16. Westinghouse Type SF Duplex Steam CompressorGovernor Shown in Section setting of the feed valve be changed by accident or design, the sameexcess pressure, 20 pounds, is always maintained. The operationof the steam and air pistons of the governor are the same as alreadyexplained for the single and duplex types, except that the AIR BRAKES 31 total pressure on top of diaphragm 28 of the excess-pressure headis always feed-valve pressure plus 20 pounds instead of a fixedpressure, as in the former types. With the feed valve set for 70pounds, approximately 90 pounds main-reservoir pressure wouldbe obtained and maintained. Troubles tvith Steam Compressor. In correcting troubles whichhave been reported in connection with the use of this governor, theWestinghouse Company have issued the following instructions: If the cutting-out pressure gradu
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