Balloon feed

Sounds great "balloon feed", we connected the 18 bar helium to a hose, big bang.. So we switched to a complete new concept the "Balloon feed" (tm) :)
It's a pink helium balloon connected to the needle valve which is connected to the venting input of the turbo pump.
When running the turbo in standby (66%) it will pump heavy gasses much better than lighter ones, so we feed it He (4) for now, because it's the same mass as D2, so pressure regulation with the needle valve should be the same for He en D2, when we start with deuterium electrolysis any D2O (20) will be pumped out by the turbo.