[D2L] 102H Intro to Valve Design & Functions Flashcards
What are three actions of valves?
start, stop, and regulate fluid flow
What is a valve’s bonnet?
the top cover of a valve
What is a valve’s operator?
any device used to move a control valve’s stem and disk
What is the purpose of a check valve?
to allow fluid flow in only one direction
Which valve has the greatest pressure drop?
Globe Valve
Which valve has the least pressure drop?
Ball Valve
What is the flow pattern for a diverting valve?
One inlet pipe, and two separate outlet pipes
What is the flow pattern for a mixing valve?
two separate inlet pipes, and one outlet pipe
To isolate piping at the a compressor, the service valves must be in the back-seated position
T or F
False, they can either be front-seated or back-seated
What are two common applications for a four-way valve?
heat pumps and defrost
What is a solenoid valve?
a fluid stopping and starting device
What is the purpose of an evaporator pressure regulator?
maintain a minimum evaporate pressure
Where is an evaporator pressure regulator located?
down stream of the evaporator and upstream of the compressor
What is the purpose of an crankcase pressure regulator?
1) maintain a maximum evaporator pressure
2) maintain a minimum evaporate pressure
3) maintain a maximum valve outlet pressure
4) protect the compressor
5) Both C and D
both C & D
maintain a maximum valve outlet pressure
protect the compressor
What position will a crankcase pressure regulator be in if the outlet pressure is greater than the valves spring pressure?
1) the valve will begin to close
2) the valve will begin to open
the valve will begin to close
