ITEC 283 - Exam #2

Question 1

What are the 2 kinds of solenoid valves?

Answer 1

Direct-acting & Pilot operated

Question 2

Solenoid Valve: Direct-Acting

Answer 2

a mechanical force to shift the spool or lift the poppet is supplied by direct push or pull from a solenoid

Question 3

Solenoid Valve: Pilot Operated

Answer 3

uses fluid pressure taken from the line for spool shifting and does not depend on solenoid force

Question 4

Pressure control valves

Answer 4

-to either control pressure or rate flow
-a common misconception is that pressure can be controlled with an orifice or flow control device (needle valve)
- to prevent pressure from exceeding its limit

Question 5

What are the different types of pressure control valves?

Answer 5

relief valve, unloading valve, sequence valve, reducing valve, counterbalance valve, break valve

Question 6

Direct Operated

Answer 6

-low flow pumps
-high response circuits (for pressure spikes)
-pressure comp pumps
-remote operation of pilot operated relief valves

Question 7

Pilot Operated

Answer 7

-Handle higher flows and pressures and does it in a smaller package
-Cracking pressure closer to set pressure
-Slower response time