Quote: (Originally Posted by
AD_ward9)
One other thing to highlight, that seemed to have vanished in upgrading, is that the solenoid should not switch off, ever. The Inspo method of switching off the solenoid for 6 seconds at a time, is dangerous for very fast ascents, as in extreme cases the increase in intermediate pressure that occurs during those 6 seconds is enough for the valve to stick: it works over an very narrow range.
IMHO injectors should ALWAYS be able to provide 12l/m.
As I understand it - with the Vision software, the software will fire the solenoid continuously if the pO2 is more than 0.1 bar below setpoint. Not sure what the classic's controller software does however...or if AP is upgrading its software in line with the vision algorithm.
Not sure about the statement on intermediate pressure however. During ascent, the interstage pressure would stay the same until either the solenoid fires or until the over-pressure valve which is fitted to the first stage vents some gas. If it stays constant while the diver ascends fast then there would indeed be an increase is the
differential pressure across the solenoid. However I am not sure what the lift setting on the over pressure valve is vs the maximum differential pressure that the solenoid will operate at. Anyone know?
Steve