How can one determine whether a pressure-reducing valve uses ...

[imanialler]

How can one determine whether a pressure-reducing valve uses multiple stages for pressure re-duction?
 
  a. By noting the number of gauges attached to the valve
  b. By noting the DISS code
  c. By noting the ASSS code
  d. By noting the number of pressure relief vents

Question 2

To clean a cylinder valve outlet of foreign material, what should you do?
 
  a. Wipe the valve outlet with a light oil.
  b. Quickly open and then close the valve.
  c. Blow into the valve outlet a few times.
  d. Wipe the valve outlet with an alcohol swab.

[Zack0mack0101@yahoo.com]

Answer to Question 1

ANS: D
Because each pressure chamber has one safety relief vent, the user usually can determine the number of stages in a reducing valve by noting the number of relief vents present.

Answer to Question 2

ANS: B