Hydraulic Pumps Flashcards
Formation and collapse of air bubbles
Cavitation
Extra air being forced into the system causing foaming fluid at the tank and spongy function of implements.
Pseudo cavitation
Causes loss of flow
- Obstruction at pump inlet
- Viscosity of fluid
A pump that pushes out a set volume
Fixed displacement
Limits system pressure by opening and redirecting unneeded flow back to tank.
Relief valve
A pump that changes its flow to regulate system pressure as needed
Variable displacement
What is the disadvantage of unbalanced vane pumps?
Side loading the shaft causing bearing wear.
A vane pump that has 2 sides with high volume (egg shape) where shaft stays in the middle.
Balanced vane pump
A mechanical device that changes fluid from high volume to low volume areas in order to create flow.
Pump
Moves fluid from small to large volume to create rotational force.
Hydraulic motor
Flow creates
Speed(revolutions per minute)
Pressure creates
Force(rotational force is torque)
Advantages to hydraulic pumps
Ability to instantly reverse the direction of the shaft.
Dynamic braking capability.
Better weight to force ratio.
Easy style of vane pump to service
Cartridge
