. Science of railways . ough hollow staybolts which are drilled ^g inch. The connection to the whistlepipe is by means of a i/^-inch iron pipe and the T fitting. k THE MASON AIR BRAKE PUMP REGULA-TOR OR GOVERNOR. This regulator is designed to automatically controlthe air pressure in the brake system for operatingthe brakes on railroad cars. It is placed in thesteam supply pipe leading to the air pump, andregulates the amount ofsteam passing to pump,and allowing the pump torun just sufficiently tomaintain the desired airpressure in the train ser-vice pipe. Description.—^The prin-ciple on which
. Science of railways . ough hollow staybolts which are drilled ^g inch. The connection to the whistlepipe is by means of a i/^-inch iron pipe and the T fitting. k THE MASON AIR BRAKE PUMP REGULA-TOR OR GOVERNOR. This regulator is designed to automatically controlthe air pressure in the brake system for operatingthe brakes on railroad cars. It is placed in thesteam supply pipe leading to the air pump, andregulates the amount ofsteam passing to pump,and allowing the pump torun just sufficiently tomaintain the desired airpressure in the train ser-vice pipe. Description.—^The prin-ciple on which the MasonAir Brake Regulatorworks is that of anauxiliary valve (8), con-trolled by the air pressurefrom the train servicepipe, through the mediumof a metal diaphragm(24), and admits steamfrom the initial side ofregulators through a portto operate a piston (19),which in turn opens the main valve (21), and admitssteam to the pump. By referring to the sectionalview, it will be seen that the steam enters the regulator 356. Fig. Air Brake Pump Regulator. LOCOMOTIVE APPLIANCES. 357 at the side marked steam from boiler, a smallportion of it passing up through the passage {XX)to the auxiliary valve (8). This valve (8) is forcedopen by the compression of the large spiral spring(5) acting on the cricket through the cricket (6) has three studs projecting downfrom the rim, which pass through three loosely fit-ting holes in the bonnet, the lower ends resting ona button (11) which sits on the diaphragm, so thatin opening the valve (8) the diaphragm is alsoforced down. As soon as the valve (8) is opened,steam passes through and into port (Z), downunder piston (19). By raising this piston (19) themain valve (21) is opened against the initial pres-sure, since the area of valve (21) is only one-halfof that of piston (19). Steam is thus admitted tothe pump. A connection with the main air pipe ismade as indicated; and, by a passage, air entersthe chamber below the diaphrag
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