By R. Keith Mobley
Fluid energy Dynamics is a 12-chapter ebook in sections overlaying the fundamentals of fluid energy via hydraulic method elements and troubleshooting. the second one part covers pneumatics from fundamentals via to troubleshooting. this is often the most recent publication in a brand new sequence released by means of Butterworth-Heinemann in organization with PLANT ENGINEERING journal. PLANT ENGINEERING fills a distinct details want for the boys and girls who function and hold business crops: It bridges the data hole among engineering schooling and useful program. As know-how advances at more and more swifter premiums, this data provider is changing into progressively more vital. considering the fact that its first factor in 1947, PLANT ENGINEERING has stood because the major problem-solving details resource for America's commercial plant engineers, and this publication sequence will successfully give a contribution to that source and acceptance.
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Additional info for Fluid Power Dynamics
Figure 3-23 Pressure-compensated pump. sufficient to overcome the spring force of the compensator. As a result, the spool lifts, allowing fluid to flow into the stroking cylinder. Although the holding cylinder also has system pressure applied, the area of the stroking cylinder piston is much greater. Because of the differential pressure, the yoke is forced up to decrease flow. View B shows the yoke moving down as system pressure drops below that required to overcome the compensator spring force.
PUMP RATINGS Pumps are generally rated by their maximum operating pressure capability and their output in gallons per minute (gpm) at a given operating speed. Pressure Based on reasonable service life expectancy under specified operating conditions, the manufacturer determines the pressure rating of a pump. It is important to note that there is no standard industry-wide safety factor in this rating. Operating at higher pressure may result in reduced pump life or more serious damage. Displacement The flow capacity of a pump can be expressed as its displacement per revolution or by its output in gallons per minute (gpm).
The control consists of a compensator valve balanced between load pressure and the force of a spring, a piston controlled by the valve to move the yoke, and a yoke return 42 Fluid Power Dynamics Figure 3-1 7 Pressure compensator control. spring. With no outlet pressure, the yoke return spring moves the yoke to the full-delivery position. As pressure builds, it acts against the end of the valve spool. When the pressure is high enough to overcome the valve spring, the spool is displaced and oil enters the yoke piston.