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Adjustable Overpressure Valve is critical to creating an
overpressure in the protected space by adding the proper
resistance to the outflowing air. This valve is normally
closed and will not open unless the air pressure inside
the shelter reaches the opening pressure set by the adjustment
cap. When used with an ASR-100-AV-NBC
Safe Cell, the adjustment range is zero to 1.75 inches
of water column.
The
adjustment cap is located at the bottom of the valve assembly.
Tightening this cap increases the pressure in the protected
space. This allows you to compensate for a shelter that
is not entirely sealed up - within reason. This valve should
be used with the Differential
Pressure Gauge.
This
gives you true ventilation - air in through
the Safe Cell and out through this valve preventing the
buildup of carbon dioxide exhaled by the occupants. Carbon
dioxide poisoning will incapacitate and kill the occupants
of an enclosed space without ventilation long before oxygen
deprivation.
This
valve can be installed onto a blast
valve. A good rule of thumb is that if you are underground,
you need blast valves and if you are above ground, you do
not - unless you have a hardened structure above ground.
There is not much need for blast valves unless you have
a blast resistant shelter.
Any
protected space will benefit from this valve, especially
if it is well sealed, then this overpressure relief valve
is a necessity.
Here
is a quote from an e-mail we receieved from a customer who
purchased three of these adjustable overpressure valves
in May of 2009:
"Dear
Sir,
We
have received your adjustable overpressure valve. It is
simply superb. We would be interested in buying your other
products. Please send a catalogue of all of your products."
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