. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . isconnected to the boiler, and the lower pipe to the drain, ash-pit, orheater. The normal condition of the damper is to be wide open, theweight holding it in that position. To operate it, a given load—say 60lbs. to the inch—is produced on the regulator diaphragm, by screwingthe liandle in. When the pressure in the boiler reaches 60 lbs., it liftsthis load and permits steam to enter the space over the piston, slowlyp
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . isconnected to the boiler, and the lower pipe to the drain, ash-pit, orheater. The normal condition of the damper is to be wide open, theweight holding it in that position. To operate it, a given load—say 60lbs. to the inch—is produced on the regulator diaphragm, by screwingthe liandle in. When the pressure in the boiler reaches 60 lbs., it liftsthis load and permits steam to enter the space over the piston, slowlypushing it down and closing the damper. When the boiler pressurefalls below 60 lbs. the valve closes, and the pressure, passing from thetop to the bottom of the piston, puts the piston in equilibrium, andallows the weight, slowly settling d:wn, to open the damper, thuscontrolling the pressure at the desired limit. II. Pressure Regulators.—The Foster Pressure-regulating andReducing Valve is shown in Pig. 4. The principle of operation is asSteam is admitted at A and delivered at B, at a dependent upon the open-ing ot valve, 2), which may be regulated by turning. Fig. 3.—Kellams damper regulator. 3. -Curtis damperregulator. follows of valve, D, whichspindle, P. to the right to diminish the pressure, or theleft to increase tiie pressure. The delivery pressure, en-tering chamber, K, tends to raise the diaphragm, 11, anddraw valve, D, toward its seat ; in opposition to this, thespring, with its lower end bearing on winged nut, E. tendsto open the valve until there is an equilibrium establishedbetween these two forces. Under this condition, if thedelivery pressure fails, the pressure on the diaphragm isdiminished, and the spring, overcoming the lighter re-sistance, opens the valve until the equilibrium is againestablished and the pressure restoied ; on the other hand,any increased delivery pressure bearing on the diaphragmovercomes the resistance of the spring and dra
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
