Valves & Plumbing 111 Flashcards
(37 cards)
What is a valve?
A pressure containing device designed to control the flow of fluid media (liquids, gases, vapors, solids in suspension)
To control a valve means what?
To start, to throttle (regulate), stop and prevent backflow.
What valve prevents backflow?
Check valve
Which valves throttle(regulate) flow?
Globe and Angle Valve
Where did Gate valves get their name?
Ancient castle gates
A gate valve should never be…
Throttled(regulated).
What can happen if you throttle a Gate valve?
Erosion and even vibration and chatter. Can cause damage to the seating surfaces.
What is a globe valves main purpose?
To regulate flow… or used when a valve must be frequently open and closed.
Globe valves can be used for….
Hot and Cold water, air, oil, gas, and volatile liquids.
Lift checks are used for
reciprocating pump and air compressor
Swing checks should not be used in a…
rapid cycling system
Two hole up valve means
Level up two bolts
SWP =
Steam Working Pressure
CWP =
Cold Working Pressure
WOG =
Water Oil Gas
PSIG =
Pressure Square Inch Gauge
Solenoid Valve is used on
Gas lines
What valve has a resiliant seat to protect from corrosion?
Butterfly valve.
Circuit Balancing valve does what?
Ensures designed flow rate is achieved regardless of drop in system pressure.
A ball valve comes in how many pieces?
Three
Corporation cock is joined on each side by
IPS(Iron Pipe Size) by Flare
Curb cock connected on each by
Flare by Flare
What is a rated valve?
A valve that is rated for a certain amount of PSI for WOG or SWP
If a valve is not rated then the PSI is….
125 PSI WOG & O PSI WSP
