drysuit dump valve

I replaced my dump valve with a low profile apex one - I did this a while ago but finally got to test it out yesterday. When I was doing the normal pre-dive check on it, I turned it all the way open - but instead of stopping when it was all the way opened it just sort of clicked and I could...

I apologise if this is in the wrong forum. Back in June, I had Northern Diver fit one of their V-Teck dump valves to my arm and it developed a leak after diving in a silty patch of the ocean, so I want to give it a proper clean before buying a replacement (blowing compressed air through it...