Author Question: Why is it recommended that an acetylene cylinder valve never be opened more than one-half turn? ... (Read 36 times)

anshika · **on:** Jul 24, 2018

Why is it recommended that an acetylene cylinder valve never be opened more than one-half turn?

A) To minimize the strain of the high cylinder pressures on the valve threads
B) To allow rapid shutoff in the case of an accident
C) To prevent the valve from getting stuck in the fully opened position
D) To regulate the pressure to the torch handle

Question 2

The operation of a thermostatic expansion valve can best be described as:

A) Evaporator pressure = evaporator pressure + bulb pressure.
B) Bulb pressure + evaporator pressure = spring pressure.
C) Spring pressure = bulb pressure + evaporator pressure.
D) Bulb pressure = evaporator pressure + spring pressure.