Attaching The First Stage To The Cylinder Valve (Din) - Apeks Regulator Owner's Manual

Attaching the First
Stage to a Cylinder
Valve (DIN)
WARNING: OPEN VALVES
SLOWLY TO AVOID OVER-
PRESSURIZATION. When
pressurizing your SCUBA system, be
sure to open the cylinder valve slowly
to minimise the generation of heat.
Failure to do so, with Enriched Air
Nitrox (EAN) present, increases
the risk of combustion that can
lead to serious injury or death.
It is considered safe practice,
especially when using EAN, to
open the cylinder valve slowly and let the first stage pressurize slowly.
Rapid pressurization causes adiabatic compression of the breathing
gas, which generates heat inside the first stage. Heat, along with
elevated percentages of oxygen and an ignition source (from
contamination) are the ingredients that can cause combustion. This is
why it is necessary to keep the interior of the regulator clean and the
percentage of oxygen below 40% along with the slow opening of the
valve.
To attach a DIN-style first stage to the cylinder valve, follow these
steps:
1. Remove the protector cap from the cylinder valve, if fitted. With
the cylinder valve facing away from you, release a small amount of
air from the cylinder by turning the handwheel counter-clockwise
to open the valve slightly. When air is heard exiting, immediately
close the valve. This will clear any moisture or debris that may be
inside the threaded cylinder valve opening.
2. Position the first stage near the cylinder valve so that the LP hose
of the primary second stage will be routed over the desired
shoulder. Thread the first stage DIN connector into the cylinder
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