Module 7

Question 1

a valve that controls system pressure by closing to reduce pressure to a safe operating level

Answer 1

Pressure-regulating valve

Question 2

A valve that opens at a preset pressure to exhaust air until pressure drops below the set level

Answer 2

Safety valve

Question 3

a valve that gradually opens to discharge excess air as pressure increases above set level

Answer 3

Pressure-relief valve

Question 4

pneumatic circuits that allow an actuator to operate only after a certain sequence of operations takes place

Answer 4

Logic functions

Question 5

The pressure controls in a pneumatic system are used to _____ the air pressure.

Answer 5

Limit

Question 6

The air pressure can be limited by starting and stopping the compressor, or by _____ either the intake or discharge valves.

Answer 6

Unloading

Question 7

During the time a compressor is being unloaded, it will not compress air because the valves are held _____.

Answer 7

Open

Question 8

Pressure-regulating valves are usually located at _____.

Answer 8

Outlet points or Air stations

Question 9

Pressure-regulating valves regulate air at the _____ port.

Answer 9

Outlet

Question 10

The maximum pressure in a pneumatic system is controlled by a(n) _____ valve.

Answer 10

Safety

Question 11

Pressure-relief valves are usually set to open at a point just _____ the system pressure setting.

Answer 11

Above

Question 12

A pressure-relief valve must be able to relieve more air that the _____ can supply.

Answer 12

Compressor

Question 13

Precision regulators were first “special” regulators, but now they are _____ with some manufactures.

Answer 13

Standard

Question 14

The constant air bleed in a precision regulator prevents the diaphragm from _____.

Answer 14

Modulating

Question 15

The best way to regulate air pressure in an inaccessible location is with a(n) _____ regulator.

Answer 15

Pilot-controlled

Question 16

Pilot-controlled regulators require _____ pilot air.

Answer 16

Regulated

Question 17

The air pressure in a high-volume line can be regulated by the use of a(n) _____.

Answer 17

Pilot-controlled regulator or Booster relay

Question 18

Regulating valves with relief capabilities are usually made to handle only _____ quantities of air.

Answer 18

Low-volume

Question 19

Vented regulating valves have relief ports in either the valve body or the _____.

Answer 19

Bonnet

Question 20

On air lines used to blow away dirt and chips, a special regulator that vents at a nozzle pressure of _____ psi is required.

Answer 20

29

Question 21

The primary purpose of all of the pressure controls in a pneumatic system is to _____.

Answer 21

Limit air pressure

Question 22

Which of the following types of relief valves provide the smoothest relief control?

a. Ball poppet
b. Diaphragm
c. Safety
d. Spool poppet

Answer 22

b. Diaphragm

Question 23

What is the best location for a pressure-regulating valve in a pneumatic system?

Answer 23

At an air station

Question 24

When diaphragm pressure-regulating valves operate, they _____.

Answer 24

Modulate slightly

Question 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

Answer 25

b. Safety

Question 26

Pilot-controlled regulators will not function without _____.

Answer 26

Regulated pilot air

Question 27

Pressure-relief valves are usually adjusted to open at what pressure level?

Answer 27

Above the control valve setting

Question 28

Which of the following types of valves is used to regulate a high-volume air line?

Answer 28

Booster relay

Question 29

Initially, at what pressure does a relief valve open?

Answer 29

Cracking

Question 30

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

Answer 30

29