Pneumatic Flashcards
What happens when air is compressed to a smaller volume
It increases its pressure
A dynamic air compressor is frequently referred to as a
Non-positive displacement
The size of the filter is generally determined by the machines what
Intake requirements
Water also tends to promote rust and scale buildup in pipes and fittings for these reasons corrosion resistant piping should be used what does this do
Extenze the pipe service life
When a volume of air is reduced by a compressor its pressure
Increases
Compressors classified according to operation identified or referred to as positive displacement and blank compressors
Dynamic
Reciprocating compressor’s are classified according to their blank and the blank of their cylinders
Operation and physical arrangement
Reciprocating compressor’s that have two or more pistons of different size are called blank compressors
Multi stage
In a compressed air system suction valve unloaders are actuated by air pressure from the
Receiver
Name the four types of positive displacement rotary compressor’s
Rotary screw, sliding vein, impeller, liquid ring
Dynamic compressors have blank displacement
Nonpositive
The amount of cooling that can take place in a water cooled compressor depends on the blank and blank of the water
Temperature and volume
After lubricating oil is added the air should travel no more than about
30 feet
The intake filter of an air compressor should be placed where the air is blank and blank
Coolest and cleanest
Dust washed out of the air by an oil mist collects in the
Lubricant
The air delivered to a pneumatic system should be conditioned by removing water oil and
Solid particles
Filter separators can be placed in the supply branch or blank blank lines of a pneumatic system
Individual feed
In two cylinder adsorption dryers one cylinder dries the air while the other cylinder is being
Reactivated
And airline filter remove oil and water droplets and solid particles from the air through
Centrifugal force
Airline lubricators usually add oil to the airstream at the rate of one drop for every blank CFM
10
A compressor increases the pressure of the air by
Decreasing its volume
Which of the following is used to activate suction unloading valves
Receiver air pressure
Which of the following is classified as a dynamic compressor
Centrifugal
Which of the following best determines the amount of conditioning required by the compressed air after it leaves the compressor
How the air is used
 Blank blank or views are used for showing the physical relationship and interconnections between components
Pictorial symbols
Schematic symbols more clearly emphasize the function and blank of blank of components
Method of operation
Reading schematics and understanding a circuit can be best accomplished by studying small
Segments at a time
Pilot or signal lines are drawn as
A series of long dashes
Name the three types of symbols commonly used in pneumatic diagrams
Pictorial, cutaway, schematic
The construction of components is emphasized in blank symbols
Cutaway
Schematic symbols emphasize the function and blank of a component
Operation
Circles are used in schematics to represent blank motion or devices
Rotary
In a schematic diagram the supply air to the pneumatic system is represented by line and a
Hollow triangle
If there is no standard schematic symbol to be found on the chart for a type of device the blank then makes a graphic symbol
Manufacturer
What two types of symbols are combine to form composite graphic symbols
Complete and simplified
Mainline conductors in a schematic circuit diagram are shown as
Single unbroken lines
A safety circuit used to limit the operating pressure in a pneumatic system will maintain
Both the minimum and maximum pressures
According to a ASME codes, receivers must be equipped with blank blank and safety valves
Pressure gauges
The spacing of pipe supports should be placed close enough together to blank any appreciable blank
Prevent and sag
It is generally better to select a slightly oversized pipe this provides a certain margin of safety and the system can then accommodate blank blank without significant alterations
Additional demands
If the flare is not a good one
Replace the flare
How long of a hose for a pneumatic compressor
Hoses should not be any longer than necessary
A good planned maintenance program requires?
All equipment is checked on a regular basis
Excessive pressure results in blank blank, possible over stressing, and premature failure of parts
Accelerated wear
Air control valves for industrial control circuits are, for the most part, designed and built for use with pressures up to blank psi
150
When is the best time to perform your daily check
Early in the shift
Records of control valve and cylinder operating cycles are usually obtained from blank blank
Production records
The troubleshooting checks themselves are determined by the blank and blank of blank in the system
Type and number of components
The sequence of troubleshooting steps described in this lesson is based on to operations number one determining if there is
Any air pressure in the supply system
The system description and operation section provides a concise description of signal, logic, and actuation functions not
Troubleshooting
When piston seals become worn and leak, air continually
Escapes through the exhaust port
If the valve action is sluggish check the
Moving parts
Heat generated during compression is controlled in two ways, by cooling and buy
Limiting the pressure of the compressed air
If the surrounding air is dusty or oily, more frequent cleaning, possibly with a
Detergent or steam is required
What is the greatest wear on a discharge valve
Carbon deposits
Hey motor starting controller on a compressor is checked by starting to compressor after?
Letting out all of the air in the compressor reservoir
Several maintenance items are the same for all rotary compressors, lubrication, bearings, and seals not
Intake valves
A control malfunction can best be isolated by analyzing the performance, or lack of performance, of the
Components in the pneumatic circuit
In some circuits such a loss of power may put the circuit blank of blank or stop it entirely
Out of sequence
What is used to activate a solenoid on a pneumatic control valve
Electric current
If a valve is manually shifted and the circuit response is not correct because maybe low blank blank
Air pressure
Swollen seals in a control valve usually indicate that an improper blank was used in the pneumatic system
Lubricant
What kind of cylinders are used for most industrial applications
Tie rod
Applications that involve higher temperatures or other harmful conditions require special seals when they get to be above what degree Fahrenheit
200
A gland or bushing acts as a blank for the piston rod
Bearing
Improper tie rod torque can be another source of
Internal misalignment
The function of an internal cushion is to protect the blank from damage
Cylinder
Good cylinder performance depends on accurate mounting and blank of the cylinder
Alignment
Without this, air motors will have a limited service life
Clean filtered air
When you repair air motors or tools remember that they are
Precision built
Which of the following is the proper lube to use when installing hose couplings
Soapy solution
Give special attention to grinders in addition to the basic considerations already discussed inspect the blank or motor blank of a pneumatic grinder
The arbor or motor shaft
Because of their what, radio piston air motors require less maintenance than other air motors
Slower operating speeds
Low pressure in the hydraulic end of air oil tank systems to overcome this lower pressure, relatively what, Are required
Large work cylinders
The main components in an air oil booster are it’s
Air piston and hydraulic ram
What valve adjusts the make up and return tank oil levels in a single pressure booster system
The Manuel shut off valve
In a combined single unit air oil cylinder, the fluids are separated by
Bleeder space
One advantage of interlocked independent air oil systems is their
Increasing the speed of the operation
