NITROUS OXIDE ( nos / n2o ) advice forum

So recently I had to have my nitrous bottle re-certified as it was over 5yrs/old. Passed fine so I went to get the bottle filled tonight.

As soon as the speed shop tried to fill the bottle, the nitrous emptied via the SPRV the moment they tried to fill it!
I'm going to bring it back to the shop that re-certified it, as presumably they wouldn't let it out the door if it cannot hold pressure; we'll see what they come up with......

Other than a SPRV that has completely failed, or perhaps some debris that has caused the SPRV to stick open - is there anything else that would cause this to happen?

Strange they would pass it as you say, so the options are these;
1) They did NOT test it
2) Some debris got in to the SPRV from the filling station
3) The SPRV setting was changed after the test
4) The SPRV failed by coincidence just as it was being filled