The Deutsches Institut
Für Normung (DIN) is a German standards setting organization similar to our
American National Standards Institute (ANSI) and Compressed Gas Association
(CGA). DIN 477 is a specification that recommends cylinder valve outlet and
connector designs for specific types of gases and pressures based upon safety
considerations. These various designs have deliberate incompatibilities to
preclude the possibility of errors when handling different types of compressed
gases at differing working pressures. The two valve outlets and connectors of
interest for divers are the DIN 477 No. 13 and the DIN 477 No. 56 (formerly No.
50), both designated for use with compressed air. The DIN 477 valve and regulator
fittings are most widely used outside the U.S. The regulator first stage DIN connector
is a male screw type, and instead of clamping on to the outside of the valve as
does the yoke, it screws directly into the female DIN outlet of the valve. The
sealing O-ring is held in the end of the regulator connector rather than in the
face of the outlet. The DIN 477 system, with its captured o-ring design, has
proven to be very reliable for use with SCUBA. Outlet/Connector #13 is from DIN
477 part 1 - for cylinders with test pressure ratings up to 300 BAR and is
commonly referred to in the SCUBA industry by the slang term "200
BAR", probably because most cylinders with 300 BAR test pressures have
working pressures in the 200 BAR range. Outlet/Connector #56 is from DIN 477
part 5 – for cylinders with test pressure ratings up to 450 BAR and is commonly
referred to in the SCUBA industry by the slang term "300 BAR". The
two designs are nearly identical, but the #56 valve outlet is deliberately
deeper so the shorter #13 connector will not be long enough to seat properly.
This is a safety feature to prevent connecting a low pressure device to a high
pressure supply. It's important to understand that the "200 BAR" or
"300 BAR" descriptions are just slang terms that have nothing to do
with the pressure ratings of the outlets and connectors
themselves.
Frequently Asked
Questions about 200 BAR vs. 300 BAR
Is a 300 BAR
SCUBA valve outlet stronger than 200 BAR?
No, they are the same.
Only the first few threads in both the 200 BAR and 300 BAR outlet designs are
doing the work, the remaining threads on the 300 BAR outlet are there simply to
create a deliberate incompatibility with a 200 BAR connector. In fact, in
practice, the 300 BAR valve outlet has proven itself to be more fragile than
the 200 BAR valve outlet. The 300 BAR valve outlet is so long that the smallest
'ding' on the edge of the opening can slightly warp the cylindrical opening,
causing the regulator to become difficult or impossible to completely seat.
This problem does not seem nearly as pronounced with the 200 BAR valve outlets;
although it remains an issue and all DIN outlets should be protected from
dings.
If a SCUBA
regulator has a 300 BAR connector does it need a 300 BAR SCUBA valve?
No, the 300 BAR connector
of the regulator is designed to work just fine with a 200 BAR valve outlet on a
cylinder. The regulator connector will require fewer turns to seat with a 200 BAR outlet and is
much more convenient to use in that regard. Once fully seated in a 200 BAR valve outlet, two
threads of the regulator 300 BAR connector are visible; this is completely harmless and
normal -- two exposed threads are not going to 'weaken' anything.
If I have 200 BAR
valve outlets on my cylinders, should I purchase a regulator with a 200
BAR connector?
The DIN connectors seen
on modern regulators sold are always the 300 BAR variety that fit a 200 BAR
outlet just fine. There is no reason to seek out and use a 200 BAR connector on
your regulator.
Is the 300 BAR
SCUBA valve "better"?
No, not in any way that
engineering science can justify. The 300 BAR valve is in NO way better than a
200 BAR valve for the SCUBA applications for which they are being used. The 200
BAR DIN outlet actually has the advantage that it can accept an insert that
allows it to be used with the very common GGA V-1 connector, aka
"Yoke" or "A-clamp", in wide use on regulators in the US . Because 200
BAR valves are more widely used than 300 BAR, they benefit from economies of
scale in production and distribution, meaning that 300 BAR valves are more
difficult to find and more costly. Since 200 BAR valves can be adapted to Yoke,
are more convenient to use and less susceptible to damage, some feel the 200
BAR outlet is better than the 300 BAR outlet.
Does a yoke
adapter insert exist for my 300 BAR valve?
No. An adapter insert
does not exist, and even if it were made, we have never seen a yoke clamp long
enough to fit over the 300 BAR SCUBA valve. There is a yoke-to-din fill adapter
device for 300 BAR valves, but it is strictly for filling only.
Is there any
reason I should use a 300 BAR SCUBA valve?
For the sake of
uniformity, some divers who started with 300 BAR valves continue to select them
when purchasing new cylinders, just so all their cylinder valves have the same
type of outlet. Some individuals in diving leadership roles may insist their
students and peers use 300 BAR valves, usually with the vague justification
they are 'better' because 300 BAR is a higher pressure than 200 BAR. A common
misconception is that DIR philosophy or GUE training standards require 300 BAR
valves, which is untrue. If using the 300 BAR valve outlet will provide
uniformity, peace-of-mind or peer acceptance then do so, because there is no
major reason to avoid using 300 BAR SCUBA valves.
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