Pneumatics Flashcards
_____ _____ is the most important part of pneumatics.
Air preparation
Boxes are also known as what?
Envelopes
The inefficiency in a pneumatic system is generally the result of the necessary loss of what 3 things?
Heat during compression, friction and fluid changing direction.
Frictions causes what 2 things?
Drop in pressure and loss of energy
What is the purpose of a pressure switch?
Turns compressor on and off
What is normally closed not allowing air to flow freely?
Safety relief valve
What is normally open allowing air to flow freely?
Pressure regulator
What are used to describe components in pneumatic systems?
Symbols
What delivers sufficient amounts of air at a desired pressure?
Compressors
Compressors convert _____ energy into _____ energy.
Mechanical, potential
What is the most efficient type of compressor?
Multi-stage
What type of compressors have air drawn in as the chamber size increases and air pushed out as the chamber size decreases?
Reciprocating and sliding vane
What is used to start compressors under less torque?
Unloading
What depicts the function of fluid power components?
Schematic symbols
Air leaves the after cooler and goes to _____ prior to entering storage tanks.
Drier
ASME codes require a _____ _____ be installed on most units.
Safety valve
When hot air cools, it’s ability to carry water vapor _____.
Decreases
If compressed air is saturated, what 2 conditions will cause some water vapor to condense?
Decrease in temperature or specific volume
_____ _____ consist of a central main with small feeder lines and heads, making them simple in construction.
Grid systems
Air flow may pass through a ____ _____ in one direction only.
Check valve
What kind of cylinder is moveable in only one direction?
Single acting cylinder
What kind of cylinder is moveable in either direction?
Double acting cylinder
Cushions absorb _____ energy.
Kinetic
5 basic elements of a fundamental pneumatic circuit:
Power source, pressure switch, conductor, DCV, actuator
What does a graphic symbol reveal about a power component?
Components function
The major cause of most malfunctions in a pneumatic circuit:
Poor maintenance
Always relieve air pressure prior to _____.
Working
Mark normal _____ _____ on a gauge.
operating pressure
What keeps a piston clean?
Rod boot
What is the first trouble shooting task?
Determine characteristics of the system
What is the function of a pneumatic safety circuit?
To ensure the circuit doesn’t operate with operator in harms way.
Where do you start if there is a problem with the pneumatic system?
Beginning at the compressor then work through the rest of the system
Actuator
Actuates plug valve
Conductors
Rubber hose and piping directing plant air
Electrical conduit
Carries electrical signal and electricity to operate valve
Float
Sends signal to control room sending signal to solenoid to open or close
Flow control valve
Regulates speed of actuator
Solenoid operated DCV
Controls direction of air for opening and closing actuator
Trio unit
Filters, regulates air pressure and provides lube to components downstream
A common application of a 4 ported, 4-way directional valve is to _____ _____ _____ of a cylinder.
Cause reversible motion
When _____ _____ passes through the coil of wire, a _____ field is generated. This _____ field tracts the plunger and pulls it into the coil.
Electrical current; magnetic; magnetic
A _____ valve has a flow path which is almost straight through its center.
Ball
A ball valve does/does not offer more than one direction of flow.
Does not
The most common type of flow control valve found in a pneumatic system is the _____ valve with bypass check.
Needle
T/F A flow control valve uses metered flow out of an actuator to control speed and allow flow into it.
True
T/F A silencer can be installed on the exhaust ports of an actuator to reduce the noise and oil content.
True
A good silencer should have _____ resistance to flow, provide sound attenuation, and be _____ resistant.
Low; corrosion
What maintains constant pressure at the actuator?
Pressure regulator
An ____ ____ filter is a device that is placed in the air line at the work station to be protected.
Air line
In small/large quantities, moisture can wash away lubrication and in any quantity, will cause ____ to form.
Large; rust
_____ bowls are good because they are transparent and tough.
Polycarbonate
Add _____ drops, mist or spray into air stream.
Oil
Float
Electrical conduit
Conductor
Actuator
Trio Unit
Solenoid operated DCV
Flow control valve
