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Plumbing Level 1 > Valves > Flashcards

Valves Flashcards

1
Q

What are the letter codes for the following?
G, O, S, L, W

A

G: Gas Service
O: Oil Service
S: Steam Service
L: Liquid Service
W: Water Service

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2
Q

What does 15 WOG mean?

A

150 PSI (aka working pressure), Water, Oil or Gas

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3
Q

What is a Valve actuator?

A

Is a device used to open, close or control a valve

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4
Q

What is this picture?

A

Pneumatically actuated globe valve

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5
Q

What is a Needle Valve use for?

A

Throttle flow

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6
Q

A Gate Valve offers what when disk valve is fully open?

A

Little resistance to flow

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7
Q

What does O.S.Y stand for?

A

Outside, Stem, Yoke

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8
Q

When a valve stem is open what is shown?

A

The handle is at the bottom of the stem, with the stem valve sticking up.

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9
Q

What do we see when a Rising Stem with Inside screw is open?

A

Outside screw showing solid handle

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10
Q

What does a Globe valve do to flow?

A

Flow passes up under the seat, changing directions of flow = increased resistance / considerable pressure drop.

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11
Q

What are Globe Valves good for?

(3 points)

A

For throttling flow

Can gauge the flow rate by number of turns of the hand wheel

Shorter disk travel = fewer turns required to operate globe valves

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12
Q

True or False: Wafer-type Butterfly valve needs a gasket.

A

False, they do not need a gasket as it already comes with one.

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13
Q

Wafer Lug Type Butterfly valve is beneficial how?

A

Allows upstream piping to be left intact while downstream piping is dismantled for cleaning or revamping.

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14
Q

How do you determine flow direction on a valve?

A

Look for the arrow

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15
Q

What is a Backwater Valve?

A

Check valves that prevent backflow in a sanitary drainage system or storm water system

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16
Q

What do Stop and Drain valves do?

A

Allow the system to be drained for winterizing or repairs

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17
Q

What does a Diaphragm valve promise?

A

100% leak -tight operation

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18
Q

What situations are Pinch Valves used for?

A

Used for applications in which slurries or liquids contain large amounts of suspended solids.

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19
Q

Post Indicator Valves are used and good for what?

A

Installed underground

Has an indicating post attached to the valve riser above ground to indicated whether the valve is open or closed.

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20
Q

Pressure Relief Valves (PRV), what is it?

A

A type of safety valve

used to control or limit the pressure in a piping system or components

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21
Q

What pressure and temperature are Temp and Pressure relief valves required?

A

150 psi (1034 kPa)

210 F (99C)

22
Q

True or False: water pressure reducing valves are needed on domestic systems.

A

True. PRVs are needed domestically

Fun Fact: Municipal (city) water main’s pressure exceeds 80 psi

23
Q

What does cross - connection mean?

A

Means the contamination of a potable drinking water piping system by a non - potable substance.

To prevent contamination of potable water cross-connection is installed via backflow preventers.

24
Q

True of False: Backflow preventers come assembled and pre-tested.

A

True: Backflow preventers should not be altered or replaced with field-constructed valves.

25
Q

When installing screw joint valves, where should you place your wrench?

A

On the valve end into which a pipe is inserted.

Prevents excessive strain on the valve body / potential damage.

26
Q

What is the standard temp relief setting (Temp / pressure relief valve)?

A

99 C (210 F)

Temp / PRV is installed within the top 6 in of the tank.

27
Q

What are the 4 main differences bn pressure and DWV fittings?

pg 11 on fittings.

A
  1. Radius: Pressure = abrupt, DWV = gradual
  2. Socket end: Pressure = deeper, DWV = not so much
  3. Inner surface: Pressure = pipe wall / fitting do not line up, DWV = fitting/pipe line up to prevent blockages.
  4. Copper pressure fitting = thicker walls. DWV = not so much.
28
Q

What is a 1/8 bend?

A

A 45 degree elbow.

It takes 8 to make a circle

29
Q

What is a Bullhead Tee?

A

A tee where the run is smaller than the branch.

½” X ½” X 1” or ½” X 1”

30
Q

What is a close nipple?

A

Is a short piece of pipe, threaded from each end so that it appears as through the entire outer surface is threaded.

31
Q

What does an insert sleeve provide?

A

Provides additional support to the walls of the tubing.

32
Q

What is this picture?

A

An Insert sleeve or stiffener

33
Q

What is this?

A

A short forged brass flare nut

Used for gas applications.

34
Q

What is used after installing a crimp fitting and crimp rings?

A

A go - no - go gauge

35
Q

What are ProPEX rings made from?

A

PEX - A material. They are required to make a proper ProPEX connection

36
Q

How do you identify CPVC fire protection pipes?

A

They are orange in colour

37
Q

What does MJ mean?

A

Mechanical Joint, it’s a coupling used to joint no - hub cast iron DWV piping fittings.

38
Q

What is this thing?

A

A compression fitting.

Used to join copper tubing, steel piping, PVC, polyethylene / polybutylene.

39
Q

What is a Load - Bearing structure mean?

A

A support that helps support the weight above it

Ex: a second story or roof

40
Q

What is a Firewall constructed of?

A

Concrete or concrete block.

A Firewall has a higher overall fire rating than a Fire Separation.

41
Q

True of False: You can cut whatever you need to cut in order to get the pipe in.

A

False: reference building code / specific manufacturer’s specs for drilling / cutting of building framing.

42
Q

When do you need to talk to a structural engineer or higher up regarding cutting holes?

A

Anything larger than 38 mm (1 ½”) or 1/10 the beam depth (whichever is smaller)

43
Q

True or False: we need to identify structural components that may require sound transmission reduction.

A

True

Look for: walls bn occupancies (ex: a library and a restaurant)

Walls bn a bathroom and an entertainment room

44
Q

What do we supply for vents going out the roof?

A

Flashing / flashing cap

45
Q

What use do pipe sleeves provide?

A

They are installed prior to concrete pours in order to install pipe through these concrete openings.

46
Q

What is the point of Teleposts?

A

They support the frame work / the weight when the slab is poured.

47
Q

What is a pipe sleeve?

A

It is a hollow, cylindrical insert placed in a wall, floor, structural component or concrete formwork to allow a pipe to penetrate the structure.

Also called a can

48
Q

When is the best time to install pipe sleeves?

A

After the formwork is complete and before rebar is installed, when the deck is clear of obstructions.

49
Q

True or False: You don’t have to be around when the concrete is being poured.

A

False: You must be present in order to make quick repairs or reposition / places sleeves or hanger inserts that are disturbed.

Be there, Be early

50
Q

What is annular space?

A

The space bn a penetrating item and whatever surrounds it.

Ex: A pipe inside a sleeve. The empty space around the pipe = annular.

51
Q

What is passive fire protection?

A

Fire protection that attempts to contain fires or slow the spread of fire by dividing the building structures into compartments separated by fire- resistant wall assemblies, floor assemblies and doors.

Designed to keep fires, high temps and flue gasses within the compartment where the fire originated.

Plumbing Level 1 (14 decks)

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