Quote:
Originally Posted by Al Skierkiewicz
Gus,
The valves asked in the question are sometimes called 'check valves' but vent to atmosphere when the pilot pressure is removed. They are actually "quick exhaust" valves or "three way" valves depending on manufacturer.
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The question asked (emphasis mine) was:
Quote:
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Originally Posted by Q963
R77.G permits Check and quick exhaust valves as long as R89 is satisfied. R89 States that a pressure vent plug must be connected to a pneumatic circuit so it will vent all stored air in a reasonable amount of time to the atmosphere. R78 also says that at least one Pressure vent plug is required, implying multiple can be used. When the check valve is used in the pneumatics system it is essentially creating an additional pneumatic circuit. Each circuit would then have their own pressure vent plug, allowing them to each be evacuated in a reasonable amount of time. Would this satisfy R89 provided each pressure vent plug is easily accessible (preferably next to each other) on the robot and can be vented releasing all air into the atmosphere in a reasonable amount of time?
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The questioner clearly did NOT understand check valves to vent to atmosphere when the inlet pressure was removed.
In their response to Q926 and subsequent update to rule R77-G in Team Update 15, the GDC confirmed that "quick exhaust valves" and "check valves" are different things.
The question remains - does anyone market an item as a "check valve" that meets the GDC's definition of legality? If so, what is the function of said item?
Edit: Frank, I agree that a quick exhaust valve is in essence a degenerate form of an air-actuated 3-port valve that consolidates the control port and the inlet port. I agree that I would not use this terminology in a Q&A.
