Monthly Archives for January 2011

Hydraulic Reciprocating Pump

The term reciprocating is defined as back-and forth motion. In the reciprocating pump it is this back-and-forth motion of pistons inside of cylinders that provides the flow of fluid. Reciprocating pumps, like rotary pumps, operate on the positive principle—that is, … Continue reading

14. January 2011 by Jack
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Hydraulic Screw Pump

Screw pumps for power transmission systems are generally used only on submarines. Although low in efficiency and expensive, the screw pump is suitable for high pressures (3000 psi), and delivers fluid with little noise or pressure pulsation. Screw pumps are … Continue reading

14. January 2011 by Jack
Categories: Hydraulic Pumps and Pressure Regulation | Tags: | 1 comment

Hydraulic Lobe Pump

The lobe operation as pump uses the same principle of the external gear pump described previously. The lobes are considerably larger than gear teeth, but there are only two or three lobes on each rotor. A three-lobe pump is illustrated … Continue reading

14. January 2011 by Jack
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Centered Internal Gear Pump

Another design of internal gear pump is illustrated in figures 4-5 and 4-6. This pump consists of a pair of gear-shaped elements, one within the other, located in the pump chamber. The inner gear is connected to the drive shaft … Continue reading

14. January 2011 by Jack
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Off-centered Internal Gear Pump

This pump is illustrated in figure 4-2, view B. The drive gear is attached directly to the drive shaft of the pump and is placed off-center in relation to the internal gear. The two gears mesh on one side of … Continue reading

14. January 2011 by Jack
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Hydraulic Helical Gear Pump

The helical gear pump (fig. 4-4) is still another modification of the spur gear pump. Because of the helical gear design, the overlapping of successive discharges from spaces between the teeth is even greater than it is in the herringbone … Continue reading

14. January 2011 by Jack
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Hydraulic Herringbone Gear Pump

The herringbone gear pump (fig. 4-3) is a modification of the spur gear pump. The liquid is pumped in the same manner as in the spur gear pump. However, in the herringbone pump, each set of teeth begins its fluid … Continue reading

14. January 2011 by Jack
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Hydraulic Spur Gear Pump

The spur gear pump (fig. 4-1) consists of two meshed gears which revolve in a housing. The drive gear in the illustration is turned by a drive shaft which is attached to the power source. The clearances between the gear … Continue reading

14. January 2011 by Jack
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Hydraulic Piston Motors

Piston type motors can be in-line-axis or bent-axis types. (1) In-Line-Axis, Piston-Type Motors. These motors (Figure 4-15) are almost identical to the pumps. They are built-in, fixed- and variable-displacement models in several sizes. Torque is developed by a pressure drop … Continue reading

13. January 2011 by Jack
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Hydraulic Vane Motors

Figure 4-11 shows a vane-type motor. Flow from the pump enters the inlet, forces the rotor and vanes to rotate, and passes out through the outlet. Motor rotation causes the output shaft to rotate. Since no centrifugal force exists until … Continue reading

13. January 2011 by Jack
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