Laws & Formulas
Atmospheric pressure at sea level.
14.7 psi
The control component needed to return a 3/2 DCV to its normal position.
Spring
The component used to create flow in a hydraulic system.
Pump
Uses a spring to extend or retract
Single-acting cylinder
The two types of fluid power
Hydraulics and Pneumatics
Used to calculate the area of a circle.
Pi x (r)squared.
The ports used from a DCV to actuate a double-acting cylinder.
A & B
The operation of a hydraulic system is less expensive than
A pneumatic system
The type of work done by a cylinder
Linear
Resistance to flow in a hydraulic circuit.
Creates pressure
Measures 29.92 in./Hg
Perfect vacuum
Refers to a 4/3 DCV with a spring on each side.
Spring-centered
An electric motor and internal combustion engine are two types
prime mover
The graphic shape used for a hydraulic motor
A circle
Symbolized by an arrow drawn at a 45* angle through a component.
Adjustable, or Variable
Is equal to Pressure X Area.
Force
The number of ways in a DCV needed to move a double-acting cylinder.
Four
Non-compressibility is a desirable feature for this system.
Hydraulics
Where a single-acting cylinder returns its fluid
To the tank
The "L" in a FRL unit
Lubricator
The law that states pressure is inversely proportional to volume.
Boyle's Law
Where fluid is directed while at rest in a tandem-centered DCV.
To the tank
Stores hydraulic pressure in a system during times of rest.
An accumulator
Helps absorb the shock at the end of a stroke in a cylinder.
Cushions
States the pressure is equal in all directions in an enclosed space.
Pascal's Law