. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e hi^h pressure ex-haust through the receiver. Under theforegoing conditions, the pressure on thelow pressure piston would be approxi-mately 30 per cent, of boiler pressure,while on the high pressure piston therewould be exerted the full boiler pres-sure minus 30 per cent, which, on thisside, is back pressure. In case it is desired to convert theengine from compound to simple, it maybe done at any time by simply chang-ing the controlling valve from compoundto simple position. When this change
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e hi^h pressure ex-haust through the receiver. Under theforegoing conditions, the pressure on thelow pressure piston would be approxi-mately 30 per cent, of boiler pressure,while on the high pressure piston therewould be exerted the full boiler pres-sure minus 30 per cent, which, on thisside, is back pressure. In case it is desired to convert theengine from compound to simple, it maybe done at any time by simply chang-ing the controlling valve from compoundto simple position. When this change ismade the admission of boiler pressureagainst the outer end of emergency ex-haust valve piston, forces this valve openagainst the tension of its own spring,and the steam pressure in receiver act-ing on the inner end of the valve. Thesudden exhaust of the receiver pressurefrom the small cavity at the rear of thisintercepting valve in connection withboiler pressure acting on the smallshoulder of the reducing sleeve, so un-balances the intercepting valve as tocause it to move back to its seat, thus. RICHMOND COMPOUND— INTERCEPIING V.\LVE IN POSITION clucing sleeve will automatically changeto compound position—this being due tothe successive exhausts of the high pres-sure cylinder raising the receiver pres-sure to 30 per cent, of boiler pressure,in which event this pressure acting onthe greater area at rear of intercepting closing communication between receiverand low pressure steam chest, and at thesame time opening the admission portadmitting live steam to the low pressureside to the extent of 40 per cent, of theboiler increase of the pressure in low 562 RAILWAY AND LOCOMOIIVE ENGINEERING December. 1904. pressure cylinder from 30 to 40 per cent,of boiler pressure, and at the same timerelieving the back pressure on highpressure side, shows plainly why thepower of the engine is increased from 20to 25 per cent, by converting the enginefrom compound to simp
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