Module 7 Flashcards
a valve that controls system pressure by closing to reduce pressure to a safe operating level
Pressure-regulating valve
A valve that opens at a preset pressure to exhaust air until pressure drops below the set level
Safety valve
a valve that gradually opens to discharge excess air as pressure increases above set level
Pressure-relief valve
pneumatic circuits that allow an actuator to operate only after a certain sequence of operations takes place
Logic functions
The pressure controls in a pneumatic system are used to _____ the air pressure.
Limit
The air pressure can be limited by starting and stopping the compressor, or by _____ either the intake or discharge valves.
Unloading
During the time a compressor is being unloaded, it will not compress air because the valves are held _____.
Open
Pressure-regulating valves are usually located at _____.
Outlet points or Air stations
Pressure-regulating valves regulate air at the _____ port.
Outlet
The maximum pressure in a pneumatic system is controlled by a(n) _____ valve.
Safety
Pressure-relief valves are usually set to open at a point just _____ the system pressure setting.
Above
A pressure-relief valve must be able to relieve more air that the _____ can supply.
Compressor
Precision regulators were first “special” regulators, but now they are _____ with some manufactures.
Standard
The constant air bleed in a precision regulator prevents the diaphragm from _____.
Modulating
The best way to regulate air pressure in an inaccessible location is with a(n) _____ regulator.
Pilot-controlled
Pilot-controlled regulators require _____ pilot air.
Regulated
The air pressure in a high-volume line can be regulated by the use of a(n) _____.
Pilot-controlled regulator or Booster relay
Regulating valves with relief capabilities are usually made to handle only _____ quantities of air.
Low-volume
Vented regulating valves have relief ports in either the valve body or the _____.
Bonnet
On air lines used to blow away dirt and chips, a special regulator that vents at a nozzle pressure of _____ psi is required.
29
The primary purpose of all of the pressure controls in a pneumatic system is to _____.
Limit air pressure
Which of the following types of relief valves provide the smoothest relief control?
a. Ball poppet
b. Diaphragm
c. Safety
d. Spool poppet
b. Diaphragm
What is the best location for a pressure-regulating valve in a pneumatic system?
At an air station
When diaphragm pressure-regulating valves operate, they _____.
Modulate slightly
Which of the following types of valves limit the compressed air to a safe maximum pressure in a pneumatic system?
a. Bleed
b. Safety
c. Shutoff
d. Throttling
b. Safety
Pilot-controlled regulators will not function without _____.
Regulated pilot air
Pressure-relief valves are usually adjusted to open at what pressure level?
Above the control valve setting
Which of the following types of valves is used to regulate a high-volume air line?
Booster relay
Initially, at what pressure does a relief valve open?
Cracking
According to federal law, air hoses used to blow chips must not have a nozzle pressure exceeding _____ psi.
29
