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Johnnyvic Johnnyvic
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6 years ago
A triple-duty valve serves as a shut-off valve, a balancing valve, and a _____.
 
  a. differential pressure valve
  b. drain valve
  c. zone valve
  d. check valve

 Q. 2

Why should some refrigerants not be recovered?
 
  A) Many machines hold too little refrigerant to recover.
  B) Older refrigerants have mostly dissipated already.
  C) Type III refrigerant cannot be reused.
  D) Older machines may hold toxic chemicals.

 Q. 3

The type of valve used in piping systems with extremely low backpressure is a _____.
 
  a. swing-check value
  b. ball-check value
  c. lift-check value
  d. gate-check value
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shallonn__shallonn__
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Posts: 387
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6 years ago
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Johnnyvic Author
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#2
6 years ago
Great answers! <3
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