Category Archives for Hydraulic Pumps and Pressure Regulation

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 Pump Troubleshooting

a. Overloading. One risk of overloading is the danger of excess torque on a drive shaft. Torque is circular force on an object. An increase in pressure/pump displacement will increase the torque on a shaft if pump displacement/pressure remains constant. … Continue reading

12. January 2011 by Jack
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Hydraulic Piston Pumps Design

Piston pumps are either radial or axial. a. Radial. In a radial piston pump (Figure 3-14), the pistons are arranged like wheel spokes in a short cylindrical block. A drive shaft, which is inside a circular housing, rotates a cylinder … Continue reading

12. January 2011 by Jack
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Hydraulic Vane Pumps

In a vane-type pump, a slotted rotor splined to a drive shaft rotates between closely fitted side plates that are inside of an elliptical- or circular-shaped ring. Polished, hardened vanes slide in and out of the rotor slots and follow … Continue reading

12. January 2011 by Jack
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Hydraulic Gear Pumps

Gear pumps are external, internal, or lobe types. a. External. Figure 3-6 shows the operating principle of an external gear pump. It consists of a driving gear and a driven gear enclosed in a closely fitted housing. The gears rotate … Continue reading

12. January 2011 by Jack
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Hydraulic Pump Designs

In most rotary hydraulic pumps (Figure 3-3), the design is such that the pumping chambers increase in size at the inlet, thereby creating a vacuum. The chambers then decrease in size at the outlet to push fluid into a system. … Continue reading

12. January 2011 by Jack
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Hydraulic Pump Slippage

Slippage is oil leaking from a pressure outlet to a low-pressure area or back to an inlet. A drain passage allows leaking oil to return to an inlet or a reservoir. Some slippage is designed into pumps for lubrication purposes. … Continue reading

12. January 2011 by Jack
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Hydraulic Pump Displacement

Displacement is the amount of liquid transferred from a pump’s inlet to its outlet in one revolution or cycle. In a rotary pump, displacement is expressed in cubic inches per revolution and in a reciprocating pump in cubic inches per … Continue reading

12. January 2011 by Jack
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