Gates And Valves

Question 1

____ valves start or stop flow, but do not regulate flow

Answer 1

Gate

Question 2

_____ valves can be used to start, stop and regulate flow

Answer 2

Globe

Question 3

3 types of wedges used in fluid control elements:

Answer 3

1) Solid
2) Flexible
3) Split

Question 4

Contains the valves stem and packing

Answer 4

Bonnet

Question 5

Valve used in slurry, waste lines and other low pressure applications

Answer 5

Knife gate valve

Question 6

3 types of valve stems:

Answer 6

1) Rising
2) Non-rising
3) Outside screw and yoke

Question 7

What valve uses a ball to start and stop the flow of fluid

Answer 7

Ball valve

Question 8

3 types of on-off valves:

Answer 8

1) Gate valve
2) Knife
3) Ball

Question 9

Valve used to direct flow between two of the lines and blocks off the third

Answer 9

Three way valve

Question 10

What is the biggest disadvantage to globe valves?

Answer 10

Head loss

Question 11

3 valves designed to control flow:

Answer 11

1) Globe
2) Butterfly
2) Needle

Question 12

3 types of butterfly valves:

Answer 12

1) Wafer
2) Wafer lug
3) Two flange

Question 13

5 types of check valves:

Answer 13

1) Swing
2) Lift
3) Ball
4) Butterfly
5) Foot

Question 14

Most common check valve:

Answer 14

Swing valve

Question 15

Part of the regulating valve that converts electrical or fluid energy to mechanical energy in order to position the valve

Answer 15

Actuator

Question 16

The main part of the valve that contains the disc, seat and valve ports is what?

Answer 16

Body

Question 17

_____ type valves are used in high pressure systems such as boiler houses

Answer 17

Y-type

Question 18

______ valves are used in low-medium pressures and temperature applications

Answer 18

Butterfly valves

Question 19

_____ valves are used to make fine adjustments in the amount of fluid allowed to pass through an opening

Answer 19

Needle valves

Question 20

4 types of valve actuators:

Answer 20

1) Gear
2) Chain
3) Pneumatic or hydraulic
4) Electric

Question 21

4 things that determine valve selection:

Answer 21

1) Temperature
2) Pressure
3) Medium
4) On-off or throttling

Question 22

What is the taper on national pipe thread?

Answer 22

1/16” per 1” of thread

Question 23

A properly threaded fitting should have how many total turns?

Answer 23

7

Question 24

End of the pipe to the center of the fitting?

Answer 24

Take off

Question 25

We must use teflon tape on what 2 types of piping systems?

Answer 25

1) Oxygen
2) Caustic

Question 26

How do you find the hypotenuse of a triangle?

Answer 26

Multiply the rise or run x 1.414

Question 27

Method used to create a 90° corner?

Answer 27

3,4,5

Question 28

2 types of elbows:

Answer 28

1) 90
2) 45

Question 29

2 Branch connections that split the direction of flow?

Answer 29

1) Tee
2) Y

Question 30

Fitting used to allow expansion in pipe?

Answer 30

Expansion joint