Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . from ful-crum, then 4 X = 12,5664, and 1200+90+8= 1298, and1298 divided by = lbs., or the pressure at whichthe valve will open. Note. The moment or leverage of the steam is the total pressureacting apwards, multiplied by the distance in inches from thepivot to the valve-stem. The moment or leverage of the ballacting downwards is the total weight of the ball multiplied bythe distance in inches from the pivot to the center support ofthe ball. When t
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . from ful-crum, then 4 X = 12,5664, and 1200+90+8= 1298, and1298 divided by = lbs., or the pressure at whichthe valve will open. Note. The moment or leverage of the steam is the total pressureacting apwards, multiplied by the distance in inches from thepivot to the valve-stem. The moment or leverage of the ballacting downwards is the total weight of the ball multiplied bythe distance in inches from the pivot to the center support ofthe ball. When therefore the moment of the steam, which acts upwards,exceeds both the dead weight of the lever and valve, and alsothe moment of the ball holding the valve down, then the valverises and steam escapes. Hand Book of Calculations. 215 SIMPLE RULES RELATING TO THE SAFETY VALVE. « N>>\v the weight of the lever and valve is of so little import-ance m the matter of pressure, that working engineers usuallyomit it from their calculations, which may wisely be done, asthe simplest rules arc generally the best for Fig. 11! In the third form of the lever the power is at one end, thefulcrum at the other, and the resistance to be overcome some-wheiv between them. Rule 1. Multiply the length of the lever by the power anddivide the product by the short arm; the quotient is the resist-overcome. length of the lever is 10 inches, with a power equal to80 1!) acting at one en 1; what resistance will this power , th. short arm being 6 inch Length of the lever, 10 inches. Multiplied by the power, 30 -iiort arm, 6 480 A; ristance. 2J/.6 Hand Book of Calculations. THE LEVER SAFETY VALVE. The resistance, the short arm, and the poiver given, to findthe length of the lever. Rule 2. Multiply the resistance by the short arm, and dividethe product by the power; the quotient is the length of thelever. Example. The short arm is one inch, the resistance to be ov
Size: 1711px × 1461px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, bookdecade1890, bookpublishernewyorktaudel
