. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . n down forthe purpose of making repairs the small pet cock D orplug, which is sometimes used, should be opened for thepurpose of admitting air, which destroys the action of thesiphon. The pet cock should be closed at all times whenthe siphon is in use. STEAM-HEAT REDUCING VALVES. There are several different types or styles of pressurereducing valves in use on the locomotive for the purposeof maintaining uniform pressure in steam-heat lines. THE MASON VALVE, Ope
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . n down forthe purpose of making repairs the small pet cock D orplug, which is sometimes used, should be opened for thepurpose of admitting air, which destroys the action of thesiphon. The pet cock should be closed at all times whenthe siphon is in use. STEAM-HEAT REDUCING VALVES. There are several different types or styles of pressurereducing valves in use on the locomotive for the purposeof maintaining uniform pressure in steam-heat lines. THE MASON VALVE, Operating Parts. A. Inlet for Steam I. Main Valve Spring B. Outlet NN. Steam Passage from C. Auxiliary Valve Auxiliary Valve to D. Metal Diaphragm Piston E. Regulating Spring XX. Steam Passage Lead- F. Piston ing to Diaphragm G. Main Valve OO. Chamber Under Dia-H. Auxiliary Valve phragm Spring Construction and Operation. The Mason reducing valve (Plate n) is one of the types of valves used on locomotives for steam heating purposes and in supplying steam to stationary engines used to operate dynamos in STEAM-HEAT REDUCING VALVES. 71. PLATE STEAM-HEAT REDUCING VALVE 72 STEAM-HEAT REDUCING VALVES. train lighting. The principle upon which this type ofvalve operates is as follows: Auxiliary valve C is con-trolled by low pressure in the heating system throughthe medium of metal diaphragm D. This diaphragm iscontrolled by spring E, which may be set for any pres-sure desired in the steam-heat line. Spring E forcesauxiliary valve C off its seat when steam is admittedfrom the boiler at the side of the valve marked A. Thesteam is then free to pass auxiliary valve C throughports NN to the under side of piston F. By raising pis-ton F the main valve G is also opened against theboiler pressure. By reason of piston F having a greaterarea than valve G, steam can then pass by valve G tothe steam-heat line. When the pressure in the steam-heat line has reached the pressure at which the regu-
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