alemaozinho:
why would you wanna do that?Get your reg converted and that,s it................mmmhhhh
I recently purchased a PST, and have done a considerable amount of research about the valve/regulator attachment question, which I will share here.
ISO 12209 is a published standard that describes the issue you are discussing here.
• ISO 12209 (Gas cylinders - Outlet connections for gas cylinders valves for
compressed breathable air) was released in 2000, giving full dimensional details
and upper pressure limits for:
o In its Part 1, the yoke type connection almost universally used for SCUBA
applications, for use at up to 230 bar (23 MPa) cylinder filling pressure at
15°C
o In its Part 2, two threaded connections derived from the German DIN 477
Standard, one for use at up to 230 bar (23 MPa) cylinder filling pressure at
15°C and another for use at up to 300 bar (30 MPa) cylinder filling pressure
at 15°C
o In its Part 3, an Adaptor for 230 bar valves which allows a valve with the
threaded outlet of Part 2 to be connected to an application complying with
the yoke connection of Part 1.
As you can see, Part 1 is important to the reg manufacturers, because it defines the parameters of the high pressure yoke. Referencing page I-5 of the Scubapro MK25 regulator user instructions, "Scubapro first stage regulators are available with either of two different cylinder valve connections:
Threaded, this connector uses a knurled and threaded retaining wheel and complies with ISO 12209-2 (200 or 300 bar).
Yoke, this international connector consists of a yoke and knob type fixing screw for use in systems up to 230 bar and complies with ISO 12209-1."
So this is the answer to the first question, at least if you are using a Scubapro MK25 first stage, that you can use the yoke connector to connect to a HP tank up to 230 bar and be within manufacturer's specs for the reg. That is, as long as the tank and valve comply with Parts 2 and 3.
On to the issue of DIN valves, there are 2 types, labelled DIN 200 and DIN 300, but according to info at Diveriteexpress.com, a dealer for the PST company tanks,
"The endless confusion surround the terminology of that valve is
frustrating at times...it is commonly termed a '200-bar' valve in the US... but the proper term is DIN 477the valve itself (exclusive of the burst disk pressure) is engineered to handle pressures up to 6000 psi. The term 200-bar vs 300-bar simply
refers tothe number of threads in the opening 200-bar is DIN 477/13 and 300-bar is DIN477/50.... The terms 200-bar and 300-bar are "slang" used only in the US (which again has NOTHING to do with how strong the valve is... "
The 477/13 having 5 threads and the 477/50 having 7 threads.
(continued) "DIN regulator fitting is not long enough to mate properly with a female
7-thread DIN valve fitting, preventing the accidental connection of a high-pressure
cylinder to an older regulator not intended for high-pressure. However, a
regulator with a male 7-thread fitting will mate just fine with a female
5-thread DIN valve. Any first stage regulator DIN fitting can be attached to
a K-valve using an adapter that attaches to the regulator. The first stage
regulator yoke fitting can be attached to a 5-thread DIN valve using an adapter insert that screws into the valve. However, 7-thread DIN valves cannot be adapted to accept yoke fittings for diving, although there is a yoke adapter block used strictly for filling."
Here is a link for more info on the valves supplied with the PST co. tanks:
http://www.diveriteexpress.com/library/valves.shtml
Hope that helps.
Mark