POE Lesson 3-2 Key Terms

POE

Absolute Pressure

The total pressure exerted on a system, including atmospheric pressure.

Atmospheric Pressure

The pressure exerted by the weight of the atmosphere above the point of measurement.

Boyle's Law

The volume of a gas at constant temperature varies inversely with the pressure exerted on it.

Charles' Law

States that the volume of a confined gas is proportional to its temperature, provided its pressure remains constant.

Check Valve

Allows flow in one direction but prevents flow in the opposite direction.

Compressor

An air pump that compresses air into a receiver tank.

Crank

A part of an axle or shaft bent out at right angles, for converting reciprocal to circular motion and vice versa.

Cylinder

A device used to convert fluid power into mechanical power in the form of linear motion.

Directional-Control Valve

Used to control which path fluid takes in a circuit.

Double-Acting Cylinder

A cylinder that can act under pressure in both directions (extend and retract) to move a load.

Filter

A device used to remove contamination from a fluid.

Flow Meter

A device used to measure flow rate.

Flow Rate

The volume of fluid that moves through a system in a given period of time.

Flow Velocity

The distance the fluid travels through a system in a given period of time.

Flow-Control Valve

Used to start and stop flow in a circuit.

Fluid Power

The use of a fluid (liquid or gas) to transmit power from one location to another.

Gay-Lussac's Law

The absolute pressure of a confined gas is proportional to its temperature, provided its volume stays constant.

Hydraulics

The use of a liquid flowing under pressure to transmit power from one location to another.

Lubricator

A device used to spray an oil mist into the stream of a pneumatic system.

Pascal's Law

Pressure exerted by a confined fluid acts undiminished equally in all directions.

Piston

A sliding piece moved by or moving against fluid pressure which usually consists of a short cylindrical body fitting within a cylindrical chamber or vessel along which it moves back and forth.

Pneumatics

The use of gas flowing under pressure to transmit power from one location to another.

Pressure

The force per unit area exerted by a fluid against a surface.

Pressure Regulator

A type of pneumatic pressure control valve that controls the maximum pressure in a branch of a circuit.

Pressure Relief Valve

A type of pressure control valve that limits the maximum pressure in a hydraulic or pneumatic circuit.

Pump

A device used to create flow in a hydraulic system.

Receiver Tank

A device that holds the compressed air in a pneumatic system.

Reservoir

The tank that holds the fluid in a hydraulic system.

Single-Acting Cylinder

A cylinder that acts under pressure in one direction only and returns automatically when the pressure is released.

Solenoid

A switching device that uses the magnetic field generated by an electrical current for actuation.

Transmission Lines

Used to transport fluid in a circuit.

Valve

Any device that controls, either automatically or manually, the flow of a fluid.

Viscosity

A measure of a fluid's thickness or resistance to flow.

Volume

The amount or quantity of something.