When using nitrogen in repairing a sealed refrigeration system the nitrogen tank should always be equipped

Question

with a:

A) regulator.

B) float sensor.

C) red top.

D) hand valve.

http://www.epatest.com/609/manual/manual.jsp#r12

http://www.lewellyn.com/pdf/LewellynPM.pdf

Please once again help me. The wording on the training manuals confuses me. Here is what I find in the manual.

{When pressurizing a system with nitrogen, you should always charge through a pressure regulator and insert a relief valve in the downstream line from the pressure regulator. Relief valves MUST NOT be installed in series. If corrosion build-up is found within the body of a relief valve, the valve MUST be replaced.} So this leads me to believe the answer would be hand valve but only if relief valve is the same thing. My first guess was regulator but it was based on nothing. IS A RELIEF VALVE AND A HAND VALVE THE SAME??? AHHHH I'M LOOSING IT!

Answer 1

{When pressurizing a system with nitrogen, you should always charge through a pressure regulator

Note it says: "...ALWAYS... through a pressure REGULATOR..."

answer is A)

.