PT Flashcards
What is a “sub base”?
system lines can come into and DCV can be replaced or removed without plumbing being disconnected
What are the 3 types of 3-position valves?
Exhaust Center
Blocked Center
Pressure Center
What is a “Detent”?
Holding device to help keep moveable member in the desired shifted position.
What is “Spring Returned”?
2 position directional valve where spring returns spool to original position.
5 Ported
- Pressure
- Exhaust A
- Exhaust B
- Line A
- Line B
Most amount of “ways” in a valve
4 ways. Powered motion in both directions
3 way
Pressurize and exhaust one port
Minimum amount of postitions and ways.
2 position
2 way
What is a “flow control valve”?
Adjustable orfice, most common in needle valve
What does a “pressure regulator” do?
Limits down-stream pressure
What is a “safety release valve”?
Backs up pressure switch, limits compressor pressure
What is a “pressure switch”?
turns off and on based on pressure
Where can pressure be controlled?
At compressor and after receiver tank
What does a valve consist of?
body, moving part, connects and disconnects passages
What are 3 things a valve does?
- Control system pressure
- Direction of flow
- Rate of flow
