Gates And Valves Flashcards
____ valves start or stop flow, but do not regulate flow
Gate
_____ valves can be used to start, stop and regulate flow
Globe
3 types of wedges used in fluid control elements:
1) Solid
2) Flexible
3) Split
Contains the valves stem and packing
Bonnet
Valve used in slurry, waste lines and other low pressure applications
Knife gate valve
3 types of valve stems:
1) Rising
2) Non-rising
3) Outside screw and yoke
What valve uses a ball to start and stop the flow of fluid
Ball valve
3 types of on-off valves:
1) Gate valve
2) Knife
3) Ball
Valve used to direct flow between two of the lines and blocks off the third
Three way valve
What is the biggest disadvantage to globe valves?
Head loss
3 valves designed to control flow:
1) Globe
2) Butterfly
2) Needle
3 types of butterfly valves:
1) Wafer
2) Wafer lug
3) Two flange
5 types of check valves:
1) Swing
2) Lift
3) Ball
4) Butterfly
5) Foot
Most common check valve:
Swing valve
Part of the regulating valve that converts electrical or fluid energy to mechanical energy in order to position the valve
Actuator
The main part of the valve that contains the disc, seat and valve ports is what?
Body
_____ type valves are used in high pressure systems such as boiler houses
Y-type
______ valves are used in low-medium pressures and temperature applications
Butterfly valves
_____ valves are used to make fine adjustments in the amount of fluid allowed to pass through an opening
Needle valves
4 types of valve actuators:
1) Gear
2) Chain
3) Pneumatic or hydraulic
4) Electric
4 things that determine valve selection:
1) Temperature
2) Pressure
3) Medium
4) On-off or throttling
What is the taper on national pipe thread?
1/16” per 1” of thread
A properly threaded fitting should have how many total turns?
7
End of the pipe to the center of the fitting?
Take off
We must use teflon tape on what 2 types of piping systems?
1) Oxygen
2) Caustic
How do you find the hypotenuse of a triangle?
Multiply the rise or run x 1.414
Method used to create a 90° corner?
3,4,5
2 types of elbows:
1) 90
2) 45
2 Branch connections that split the direction of flow?
1) Tee
2) Y
Fitting used to allow expansion in pipe?
Expansion joint
