Industrial Pneumatics Flashcards
The inefficiency in a pneumatic system is generally the result of
The necessary loss of heat during air compression, friction, and fluid changing direction
A common way of sensing tank, pressure and controlling actuation and de actuation of a relatively small (5-10HP) compressor is
With a pressure switch
The safety relief valve is normally a closed or open valve
Closed or non-passing
The pressure regulator is normally a closed or open valve
Open or passing valve
The double acting cylinder has a port at each end of the cylinder, body by which air under pressure can
Enter or exhaust
What are used to describe components in pneumatic systems
Symbols
Compressors convert the mechanical energy provided by a prime mover into
The potential energy of compressed air
To accomplish useful work with a pneumatic system, a device is needed, which can supply a sufficient amount of air at a desired pressure. What is this device?
This device is a compressor
When the crankshaft pulls the piston in one direction,_______ is formed within the bore.
An increasing volume
______ is formed within the housing as the rotor is turned
An increasing and decreasing volume
It is more efficient to compress a gas to
Higher pressures in numerous stages
While unloading a compressor, inlet valve regulation holds open the inlet valve when there is no demand for air.
This allows the air to sweep in and out of the inlet valve, as the piston moves in the bore.
When air cools it’s ability to carry_____ also decreases
Water vapor
Has air passes to the air receiver
It has less potential energy then when it entered, it is cooler, cleaner, and holds less water.
After the air has left, the aftercooler and/or dryer,
It is directed to a receiver or storage tank.
ASME stands for
American Society of mechanical engineers
Simple in construction, consisting of a central main with small feeder lines, and headers
Grid piping system
When flow passes through the check valve, this is defined as
The check valves, free flow direction
A cylinder in which air pressure is applied to the movable element in only One Direction
Single acting cylinder
A cylinder in which air pressure may be alternately applied to a piston attached to a movable element to drive it in either direction
Double Acting cylinder
What does a solenoid consist of?
It basically consists of a plunger and a wire coil. The coil is wound on a bobbin, which is installed in a magnetic frame.
How does a solenoid operate?
When the electric current passes through the coil, a magnetic field is generated. The magnet attracts the plunger and pulls it into the coil. It can cause a spool to move or seal off a surface.
What type of flow path does a ball valve have?
A ball valve has a flow path which is almost straight through its center
The most common type of flow control valve found in a pneumatic system is
The needle valve with a bypass check
What does meter out mean?
This controls the speed of the air, exiting on extension or return in a cylinder
What does meter in mean?
This controls the speed entering a cylinder on the return or extend phase
What reduces the noise and oil content of the air?
A pneumatic silencer
A pressure regulator must be able to output air at a constant pressure, regardless of
Pressure variation from the upstream pressure and independent of flow
What can wash away lubrication and in any quantity will cause rust to form
Moisture
What is placed in the airline at the workstation to be protected?
Airline filter
Many of the filters manufactured and make use of polycarbonate for bowl materials, because
It is generally a good material for filters and lubricators, because it is transparent and tough
Airline lubricators, when injected into the flowing airstream, the oil can take on several forms
Drops sprays or mist
FRL stands for
Filter, regulator lubricator
What are five elements of a pneumatic system?
Power source, pressure, switch, air, conductors, directional, control valve, actuator
In unloader valve allows a compressor to
Start up with no load
The number one failure in air systems is
Poor maintenance
When saturated water goes to condense it
Decreases in temperature and volume
What protects and keeps a piston clean?
A rod boot
