Valves & Plumbing 111

Question 1

What is a valve?

Answer 1

A pressure containing device designed to control the flow of fluid media (liquids, gases, vapors, solids in suspension)

Question 2

To control a valve means what?

Answer 2

To start, to throttle (regulate), stop and prevent backflow.

Question 3

What valve prevents backflow?

Answer 3

Check valve

Question 4

Which valves throttle(regulate) flow?

Answer 4

Globe and Angle Valve

Question 5

Where did Gate valves get their name?

Answer 5

Ancient castle gates

Question 6

A gate valve should never be…

Answer 6

Throttled(regulated).

Question 7

What can happen if you throttle a Gate valve?

Answer 7

Erosion and even vibration and chatter. Can cause damage to the seating surfaces.

Question 8

What is a globe valves main purpose?

Answer 8

To regulate flow… or used when a valve must be frequently open and closed.

Question 9

Globe valves can be used for….

Answer 9

Hot and Cold water, air, oil, gas, and volatile liquids.

Question 10

Lift checks are used for

Answer 10

reciprocating pump and air compressor

Question 11

Swing checks should not be used in a…

Answer 11

rapid cycling system

Question 12

Two hole up valve means

Answer 12

Level up two bolts

Question 13

SWP =

Answer 13

Steam Working Pressure

Question 14

CWP =

Answer 14

Cold Working Pressure

Question 15

WOG =

Answer 15

Water Oil Gas

Question 16

PSIG =

Answer 16

Pressure Square Inch Gauge

Question 17

Solenoid Valve is used on

Answer 17

Gas lines

Question 18

What valve has a resiliant seat to protect from corrosion?

Answer 18

Butterfly valve.

Question 19

Circuit Balancing valve does what?

Answer 19

Ensures designed flow rate is achieved regardless of drop in system pressure.

Question 20

A ball valve comes in how many pieces?

Answer 20

Three

Question 21

Corporation cock is joined on each side by

Answer 21

IPS(Iron Pipe Size) by Flare

Question 22

Curb cock connected on each by

Answer 22

Flare by Flare

Question 23

What is a rated valve?

Answer 23

A valve that is rated for a certain amount of PSI for WOG or SWP

Question 24

If a valve is not rated then the PSI is….

Answer 24

125 PSI WOG & O PSI WSP

Question 25

What gives Gas its smell?

Answer 25

Mercaptan

Question 26

Gas cock is joined on each side by

Answer 26

IPS by IPS

Question 27

Backwater valve on a floor drain does what?

Answer 27

Allows water to come down but prevents it from coming back up

Question 28

Plug valves need to be how far under frost level?

Answer 28

Six Inches

Question 29

How deep is the frost level?

Answer 29

36 inches/3 feet

Question 30

Every gas line needs what?

Answer 30

A shutoff

Question 31

What position should valves be installed?

Answer 31

Upright

Question 32

What do you need for a compression fitting?

Answer 32

Nut and ferrule

Question 33

OSY(Outside Screw Yoke) for gate valve makes…

Answer 33

the handle rise with the gate

Question 34

Constant flow over the valves disc causes

Answer 34

pitting and creates difficult positive shutoff (Wiredrawling)

Question 35

The vent is always closet to what?

Answer 35

The house

Question 36

The Cleanout is always closet to what?

Answer 36

The curb

Question 37

All fixtures need to be what?

Answer 37

Trapped and vented