Module 7 Flashcards Preview

MT 108 Chapter 4 > Module 7 > Flashcards

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

According to federal law, air hoses used to blow chips must not have a nozzle pressure exceeding _____ psi.

29