Third year review Flashcards
Purpose of a needle valve?
They are design to control the flow of liquids or gas
Large single suction fans are generally mounted on?
Double row spherical
Roller bearing
A scoop tube is a form of?
Hydraulic clutch
90 psi of air is used for?
Air tools
Safety relief valves on pressure vessels can only be set, tested and inspected by?
Alberta Boilers Branch
What is a perfect vacuum?
-14.7 psig
How do you convert PSIG to PSIA
add 14.7
Air compressor operating at sea level would require?
Slightly less than 14.7 PSIA at the inlet
An accumulator charging for energy storage is?
90% of system pressure
Why must you never use galvanized pipe fittings for hydraulics?
Zinc reacts with fluids
Radial piston motors are?
Low speed high torque used in severed service
Gasket with staples are used to?
Ground the lids
Plate heat exchangers should not be used for?
Thick fluids or fluids that have viscosity change
How do I adjust the sliding vane clearance?
with a straight edge and a feeler gauge
What check valve has a spring?
Bypass check valve
What devices are used to maintenance a hydraulic system?
Tachometer
Pressure gauge
Flow meter
What are the two different types of hydraulic systems?
Mobile and Stationary
Which valve has an internal pilot in the out port and external drain valve
Pressure reducing valve
What is the device call to measure the pressure in a fan?
Manometer
What is the simplest form of a check valve?
Directional Control Valve
Cause of Aeration in a pump?
Inlet fitting are leaking or loose
What does a deceleration valve produce?
Speed
What are the three kinds of pressures developed by fans?
Static
Velocity
Total Pressure
How is velocity measure?
Pilot tube or Pitot tube (test purposes they both mean the same)
Where is the pressure reducing valve located?
in between the pump and the directional control valve
A hydraulic hose flare fitting with a #12 on it, What size hose should it use?
3/4 or 16/12=0.75
Which pump uses a swash plate?
The in-line axial piston pump
What is the main cause of a pump failure?
Contamination
How many watts in a horse power?
746 = 1 horse power
What is cavitation?
Is the violent collapse of entrained vapors, gas, bubbles
What pressure is normally used for hydrostatic testing?
1 -1/2 times the working pressure
What is the rotation of a factory rebuilt balanced van pump?
Right hand
What is the main cause of oxidation in hydraulic systems?
Heat
Cavitation can be the result of:
Running pump at too high a speed
An example of dynamic pump would be
Impeller
