Hydraulics Flashcards
What can cause pressure loss in a hydraulic system?
Turbulent flow
What is a great advantage of hydraulics in transmitting power?
Its versatility.
What is used to control contamination of hydraulic fluid?
Filters are used
What valve is used to reverse the operation of a hydraulic cylinder
The direction control valve
Which type of line should not be used for hydraulics? (Plastic is an option for this)
Galvanized pipe as the coating contaminates the fluid
A meter put flow control valve is used to regulate flow from which device?
Meters the flow coming from anx actuator
What is used in a hydraulic system to promote fluid cooling?
Heat exchanger is used to dissipate the heat
In hydraulics what is the name of the part that restricts flow?
An orifice is used to restrict flow.
What is the probable cause of a slow moving of immovable double acting cylinder?
A probable cause is leaking piston seals.
It is considered good maintenance practice when servicing directional control valves to replace what?
All seals and o-rings in the valve
Flow meters or gauges are most commonly used when in hydraulic systems?
When testing the system to be sure it is functional at proper pressures and flows.
Cavitation of oil in a hydraulic pump is usually caused by what?
Air in the suction line
Detents are used in valves for what purpose?
They are used to achieve positive positioning of the valve.
What statement best describes the term pressure?
Force per unit of area
What does a bypass filter allow?
Full flow of fluid
A double acting cylinder that is double ended would be controlled by which valve?
4-way direction control valve
What is the difference between a hydraulic motor and a hydraulic pump?
A hydraulic fluid drives a hydraulic motor causing it to turn a shaft connected to the motor, where as a hydraulic pump is rotated causing fluid to be moved by the pump.
Identifying a 3-way 4 position valve is done by?
Counting the number of envelopes in the valve and the number of piping connections
What should the capacity of a reservoir hold?
It should be able to hold 2 to 3 times the gpm
How are pilot lines defined on a drawing?
They are identified by long dashes
What is the primary function of hydraulic fluid?
To transmit force and energy
What is used in hudraulic systems to store energy to be used later?
An accumulator is used.
Short dashes are used for?
Drain lines to tank
Pascals theory explains why a large piston has what type of force in comparison to a small piston?
It has great force due to the large surface area to pressure to act upon
