MikeMargolis wrote: ↑Wed May 26, 2021 4:34 pm
Dear Mr. gwhite,
I am quite confused by the fittings. Seems I can wander into a decent scuba store and get an 80CF tank with a K valve, but that the brass fitting that comes with my gun will not fit onto that K valve. Is that correct?
The second link you posted will convert the K valve thread to the fitting that came with my gun? (the 232 bar DIN one)?
The first link will do the same thing but has a gauge to show how full my tank is?
Can you explain what the Steyr fill adaptor does exactly?
And can I buy this stuff in USA vs ordering from UK?
(I am one state south of you, if phone works better, I'll send you my mobile number)
Thanks again.
The fitting that goes on the K-valve is called a Yoke. You can get one that will directly go to your brass fill adapter.
The advantage of the fancy version from Best Fittings is two fold: 1) the gauge is far for accurate that the ones on your cylinders, and 2) the bleed valve allows you to drop the pressure on the threads sooner.
With Steyrs fill adapter, when you screw it onto a cylinder, it mechanically opens the valve. When the cylinder is full, you shut off the scuba tank, and then have to unscrew the cylinder with things under pressure. With the bleed valve, you can unscrew only about 1 turn, dumb the pressure, and then it's easy to unscrew the rest of the way.
The fancy fill adapter from BestFittings has a hole drilled in the end so it doesn't open the valve mechanically. It opens the cylinder valve by virtue of having higher pressure on the outside than inside. When the cylinder is full, you shut off the tank, hit the bleed valve, and unscrew the cylinder with no wear on the threads.