403 - Chapter 1 Flashcards
State Pascals Law
In an enclosed system pressure is the same.
Define pressure
Amount of force exerted on an unit area.
Conservation of Energy
Energy cannot be created nor destroyed
What is the output component of a hydraulic system?
Actuator
What is the input component of a hydraulic system?
Pump
What is the prime mover?
Whatever drives the pump
Advantages of hydraulic system.
Variable Speed Reversible Overload Protection - pressure relief valve. Small Packages Can be stalled Hydraulic oil Pressure in a column of fluid
What can you definitely say about pressures on the opposite sides of an orifice when oil is flowing through it?
The pressure is different, i.e. there is a pressure drop.
If three 200 psi check valves are connected in series, how much pressure is required at the pump to push the oil through all three? I parallel?
600 psi, 200 psi
8 components of a hydraulic system:
Tank Pump Prime mover Valves Actuator Piping or conductor Filtering Brain, control computer
Advantages of fluid power
Ease and accuracy of control.
Multiplication of force.
Constant force of torque.
Simplicity, safety, and economy.
Disadvantages of fluid power:
Oily and messy
Catastrophic failure, bursting of lines and loss of control.
Noisy
Combustability of oils, very hot.
Two types of fluid power:
Hydraulics
Pneumatics
Brain open loop
Brain closed loop
System with humans
All with computers
Components of Nuematics
Compressor Prime mover Valves Actuator Piping Filtering
Single most engineered product? #2?
Electric motor, pump
Head pressure:
Force produced at the bottom of a column of liquid.
Atmospheric pressure at sea level =
- 7 PSI @ 60 degrees
29. 9 in Hg
Vapor pressure:
Pressure at which a liquid boils for a specific temp.
4 types of pump pressures:
Suction pressure
Discharge pressure
Stuffing box pressure
Developed pressure
Suction pressure
The actual pressure, positive or negative, at the pump suction nozzle.
Discharge pressure
The actual pressure at the pump discharge nozzle.
Stuffing Box Pressure
The pressure acting on the stuffing box (seal chamber) inside the pump.
Developed Pressure
Also referred to as delta P, or the change in pressure.
Developed P = discharge P - suction P
Charles Law
The volume of a gas at a constant pressure is directly proportional to its absolute temperature.
