Valves Flashcards
What are the letter codes for the following?
G, O, S, L, W
G: Gas Service
O: Oil Service
S: Steam Service
L: Liquid Service
W: Water Service
What does 15 WOG mean?
150 PSI (aka working pressure), Water, Oil or Gas
What is a Valve actuator?
Is a device used to open, close or control a valve
What is this picture?
Pneumatically actuated globe valve
What is a Needle Valve use for?
Throttle flow
A Gate Valve offers what when disk valve is fully open?
Little resistance to flow
What does O.S.Y stand for?
Outside, Stem, Yoke
When a valve stem is open what is shown?
The handle is at the bottom of the stem, with the stem valve sticking up.
What do we see when a Rising Stem with Inside screw is open?
Outside screw showing solid handle
What does a Globe valve do to flow?
Flow passes up under the seat, changing directions of flow = increased resistance / considerable pressure drop.
What are Globe Valves good for?
(3 points)
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
True or False: Wafer-type Butterfly valve needs a gasket.
False, they do not need a gasket as it already comes with one.
Wafer Lug Type Butterfly valve is beneficial how?
Allows upstream piping to be left intact while downstream piping is dismantled for cleaning or revamping.
How do you determine flow direction on a valve?
Look for the arrow
What is a Backwater Valve?
Check valves that prevent backflow in a sanitary drainage system or storm water system
What do Stop and Drain valves do?
Allow the system to be drained for winterizing or repairs
What does a Diaphragm valve promise?
100% leak -tight operation
What situations are Pinch Valves used for?
Used for applications in which slurries or liquids contain large amounts of suspended solids.
Post Indicator Valves are used and good for what?
Installed underground
Has an indicating post attached to the valve riser above ground to indicated whether the valve is open or closed.
Pressure Relief Valves (PRV), what is it?
A type of safety valve
used to control or limit the pressure in a piping system or components
What pressure and temperature are Temp and Pressure relief valves required?
150 psi (1034 kPa)
210 F (99C)
True or False: water pressure reducing valves are needed on domestic systems.
True. PRVs are needed domestically
Fun Fact: Municipal (city) water main’s pressure exceeds 80 psi
What does cross - connection mean?
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.
True of False: Backflow preventers come assembled and pre-tested.
True: Backflow preventers should not be altered or replaced with field-constructed valves.
When installing screw joint valves, where should you place your wrench?
On the valve end into which a pipe is inserted.
Prevents excessive strain on the valve body / potential damage.
What is the standard temp relief setting (Temp / pressure relief valve)?
99 C (210 F)
Temp / PRV is installed within the top 6 in of the tank.
What are the 4 main differences bn pressure and DWV fittings?
pg 11 on fittings.
- Radius: Pressure = abrupt, DWV = gradual
- Socket end: Pressure = deeper, DWV = not so much
- Inner surface: Pressure = pipe wall / fitting do not line up, DWV = fitting/pipe line up to prevent blockages.
- Copper pressure fitting = thicker walls. DWV = not so much.
What is a 1/8 bend?
A 45 degree elbow.
It takes 8 to make a circle
What is a Bullhead Tee?
A tee where the run is smaller than the branch.
½” X ½” X 1” or ½” X 1”
What is a close nipple?
Is a short piece of pipe, threaded from each end so that it appears as through the entire outer surface is threaded.
What does an insert sleeve provide?
Provides additional support to the walls of the tubing.
What is this picture?
An Insert sleeve or stiffener
What is this?
A short forged brass flare nut
Used for gas applications.
What is used after installing a crimp fitting and crimp rings?
A go - no - go gauge
What are ProPEX rings made from?
PEX - A material. They are required to make a proper ProPEX connection
How do you identify CPVC fire protection pipes?
They are orange in colour
What does MJ mean?
Mechanical Joint, it’s a coupling used to joint no - hub cast iron DWV piping fittings.
What is this thing?
A compression fitting.
Used to join copper tubing, steel piping, PVC, polyethylene / polybutylene.
What is a Load - Bearing structure mean?
A support that helps support the weight above it
Ex: a second story or roof
What is a Firewall constructed of?
Concrete or concrete block.
A Firewall has a higher overall fire rating than a Fire Separation.
True of False: You can cut whatever you need to cut in order to get the pipe in.
False: reference building code / specific manufacturer’s specs for drilling / cutting of building framing.
When do you need to talk to a structural engineer or higher up regarding cutting holes?
Anything larger than 38 mm (1 ½”) or 1/10 the beam depth (whichever is smaller)
True or False: we need to identify structural components that may require sound transmission reduction.
True
Look for: walls bn occupancies (ex: a library and a restaurant)
Walls bn a bathroom and an entertainment room
What do we supply for vents going out the roof?
Flashing / flashing cap
What use do pipe sleeves provide?
They are installed prior to concrete pours in order to install pipe through these concrete openings.
What is the point of Teleposts?
They support the frame work / the weight when the slab is poured.
What is a pipe sleeve?
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
When is the best time to install pipe sleeves?
After the formwork is complete and before rebar is installed, when the deck is clear of obstructions.
True or False: You don’t have to be around when the concrete is being poured.
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
What is annular space?
The space bn a penetrating item and whatever surrounds it.
Ex: A pipe inside a sleeve. The empty space around the pipe = annular.
What is passive fire protection?
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.
