Flashcards in Module 7 Deck (30):
1
a valve that controls system pressure by closing to reduce pressure to a safe operating level
Pressure-regulating valve
2
A valve that opens at a preset pressure to exhaust air until pressure drops below the set level
Safety valve
3
a valve that gradually opens to discharge excess air as pressure increases above set level
Pressure-relief valve
4
pneumatic circuits that allow an actuator to operate only after a certain sequence of operations takes place
Logic functions
5
The pressure controls in a pneumatic system are used to _____ the air pressure.
Limit
6
The air pressure can be limited by starting and stopping the compressor, or by _____ either the intake or discharge valves.
Unloading
7
During the time a compressor is being unloaded, it will not compress air because the valves are held _____.
Open
8
Pressure-regulating valves are usually located at _____.
Outlet points or Air stations
9
Pressure-regulating valves regulate air at the _____ port.
Outlet
10
The maximum pressure in a pneumatic system is controlled by a(n) _____ valve.
Safety
11
Pressure-relief valves are usually set to open at a point just _____ the system pressure setting.
Above
12
A pressure-relief valve must be able to relieve more air that the _____ can supply.
Compressor
13
Precision regulators were first "special" regulators, but now they are _____ with some manufactures.
Standard
14
The constant air bleed in a precision regulator prevents the diaphragm from _____.
Modulating
15
The best way to regulate air pressure in an inaccessible location is with a(n) _____ regulator.
Pilot-controlled
16
Pilot-controlled regulators require _____ pilot air.
Regulated
17
The air pressure in a high-volume line can be regulated by the use of a(n) _____.
Pilot-controlled regulator or Booster relay
18
Regulating valves with relief capabilities are usually made to handle only _____ quantities of air.
Low-volume
19
Vented regulating valves have relief ports in either the valve body or the _____.
Bonnet
20
On air lines used to blow away dirt and chips, a special regulator that vents at a nozzle pressure of _____ psi is required.
29
21
The primary purpose of all of the pressure controls in a pneumatic system is to _____.
Limit air pressure
22
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
23
What is the best location for a pressure-regulating valve in a pneumatic system?
At an air station
24
When diaphragm pressure-regulating valves operate, they _____.
Modulate slightly
25
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
26
Pilot-controlled regulators will not function without _____.
Regulated pilot air
27
Pressure-relief valves are usually adjusted to open at what pressure level?
Above the control valve setting
28
Which of the following types of valves is used to regulate a high-volume air line?
Booster relay
29
Initially, at what pressure does a relief valve open?
Cracking
30