. American engineer and railroad journal . the mainvalve to force It open against the pressure of the live steamon the differential area of the reducing valve. This opens theintercepting valve and at the same time closes the reducingvalve. The engine is then working compound. The reducing The following formula may be used to determine the pres-sure in the receiver when working simple, or reducing valvepressure, which we will represent by p, and the receiverpressure required to open the main valve, or pi. Then Let a. — area at Y (Fig. 3). I-iet b ™ area at X Jsel c rz area ,-it z Let P rr boile
. American engineer and railroad journal . the mainvalve to force It open against the pressure of the live steamon the differential area of the reducing valve. This opens theintercepting valve and at the same time closes the reducingvalve. The engine is then working compound. The reducing The following formula may be used to determine the pres-sure in the receiver when working simple, or reducing valvepressure, which we will represent by p, and the receiverpressure required to open the main valve, or pi. Then Let a. — area at Y (Fig. 3). I-iet b ™ area at X Jsel c rz area ,-it z Let P rr boiler p ressure. P ( a— h id P (a- -b) = Pi The ratio of cylinder volumes, in the Mellin system is made:., to 1, as nearly as may he, keeping the diameters to thenearest H in. The most delicate problem in designing a two-cylinder compound is to equalize the work between the highand low-pressure sides under varying conditions. This isdone by carefully adjusting the lap of the valves, and while 132 AMERICAN ENGINEER AND RAILROAD COMPOUND POSITIONFIG. 3. INTERCEPTING VALVE MELLIN COMPOUND.
Size: 1788px × 1398px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
