Valves Flashcards
1
Q
On and off/Non directional valves
A
Gate, ball, and plug
2
Q
Regulates/directional valves
A
Globe, butterfly, and diaphragm
3
Q
3 valve stems
A
Rising, non rising, and outside screw and yoke (OS&Y)
4
Q
Y type valves
A
Used for high pressure
5
Q
Butterfly valve
A
Used for low to medium pressure/temperature
6
Q
Ball check valve
A
Used when fluid pressure changes rapidly
7
Q
Relief valves
A
Used to relieve excess pressure. Don’t field adjust
8
Q
Actuator types
A
Gear, chain, electric, and pneumatic & hydraulic (must fail in failed safe position)
9
Q
Rigging valves
A
Use straps only and wrap around the body
10
Q
How to select valves
A
Temperature, medium, pressure, environment, and on, off, or throttling
11
Q
Wedges
A
Solid,flexible, split, and double disc
