Hydraulic Principles
Tanks and Fluids
Pumps and Motors
Pressure Control
Flow Control
100
Conforms to the shape of the container. Practically incompressible. Applies pressure in all directions.
What is the advantage of using a liquid?
100
I am the measurement of a fluids resistance to flow at a specific temperature.
What is viscosity?
100
I provide flow to the hydraulic system.
What is a pump?
100
I am used to protect system components from exceeding the maximum system pressure.
What is a relief valve?
100
I can be either fixed or variable.
What is orifice size?
200
Pressure is the force of a fluid, usually measured in one of these two units.
What is PSI or kPa?
200
I am used to control the temperature of a high pressure hydraulic cylinder.
What is an oil cooler?
200
Name the two types of pump classifications.
What is positive displacement and non-positive displacement.
200
The force required to open a relief valve.
What is cracking pressure?
200
True or False: A pressure differential valve symbol is a combination of the pressure relief valve and the pressure reducing valve.
True
300
I create pressure.
What is an orifice? (restriction)
300
Three functions of a hydraulic tank.
What is store oil, remove heat, separate air from the oil, allow settlement of other contaminants?
300
The oil in a gear pump is moved from inlet to outlet in this direction.
What is around the outside of the gears?
300
Maintains a specified difference in pressure between two circuits.
What is a pressure differential valve?
300
When in the normal position, the supply oil flows through the valve and back to the tank.
What is an open center control valve?
400
The two basic types of hydraulic circuits.
What is series and parallel?
400
The two types of hydraulic oil coolers available.
What is air to oil and water to oil?
400
With this type of pump, output flow can only be changed with the speed of rotation.
What is a fixed displacement pump?
400
A pilot operated relief valve in series with a second circuit.
What is a sequence valve?
400
True or False: A decrease in the pressure differential across an orifice will cause a decrease in flow through the orifice.
True
500
Calculate how much load can be lifted with a cylinder with 2 inches of surface area using 200 PSI.
What is 400 lbs?
500
Two functions of an accumulator in a hydraulic system.
What is permits usage of a smaller pump, provide emergency steering and braking, maintains constant pressure, and absorbs shock loads?
500
Draw the ISO symbol for a bi-directional, variable displacement motor.
500
Allows two circuits of different pressures to be supplied by the same pump.
What is a pressure reducing valve?
500
This blocks the flow of oil through the valve body.
What are the spool lands?