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Sekur Navy Mask 600/1 EEBD

The Pneumatic Circuit of SNM consists of the following elements:
•
Cylinder: This is a steel cylinder with a 3 lt. hydraulic capacity, wor–
king pressure of 200 bar.

•
Cylinder valve-pressure reducer: the cylinder valve and pressure
reducer (or first stage) are obtained by the same body made of hot

printed nickel coated brass.

Moreover, this group includes:

•
Gauge. It is housed on the body of the valve, to indicate the cylin–
der charge. It is directly connected to the high pressure outlet to

provide this information also when valve is closed; it has a relief

device which prevents overpressurization of the gauge housing in

case of accidental breakage. In addition, in such a case, the gauge is

fitted with a flow restriction which limits to 25 l/min (with an initial

pressure of 200 bar) the air loss from the cylinder.

•
Safety valve. It’s on the head of medium pressure chamber of the
pressure reducer and is activated during malfunction of the same,

to avoid that its components, sized to work at medium or low pres
–
sure, can be submitted to dangerous pressures. It is designed so to

deliver and dispose at least 400 l/min and to avoid that the medium

pressure exceeds 30 bar.

دسته: dpi برچسب: dpi, sekur
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توضیحات

SNM provides breathable air contained in a cylinder through a
pneumatic system which adjusts quantity and pressure of air so to

make all parametres suitable for breathing.

•
The cylinder contains 600 litres, which under normal conditions of
use are enough to grant about 15 minute duration.

•
However, this value is indicative, because it can be significantly in–
fluenced by numerous parameters such as: the effort exerted du
–
ring the escape, the user’s size and his own stress condition.

•
The pressure reduction is fulfilled in the pneumatic circuit thanks
to the presence of two elements called first stage, or pressure re
–
ducer, and second stage or demand valve.

•
In SNM the first stage is built in the cylinder valve so that the first
stage and the valve are one object only. This solution provides a lot

of benefits as to simplicity and lightness.

•
The device is activated by turning the valve knob. The handle has a
loose ring that prevents accidental openings or closings.

•
As required by the norm, there is a seal that shows whether the
device is intact with its entire reserve of air.

•
The pressure reducer is also equipped with a pressure gauge that
provides information on the cylinder charge (the needle must be

within the green field).

•
The air coming from the cylinder through the valve meets the first
stage, thereby reducing its pressure until the value of “medium

pressure” and then reaches the second stage, where flow and pres
–
sure are reduced to such a point that air is finally ready to enter

into the mask through the demand valve. The demand valve and

the mask always remain within a slight positive pressure that pre
–
vents the entry of polluted air from outside.

•
The whole apparatus is supported and protected by an appropriate
bag with a strap and belt with a pocket to house the mask with the

demand valve (second stage) before use.

REFERENCE NORM

•
EN 402 and ISO 23269-1 – Lung governed demand selfcontained
•
open-circuit compressed air breathing apparatus with full face
mask or mouthpiece assembly for escape.

CERTIFICATIONS

•
EC Certified according to 2014/90/UE MED Directive
•
EC Certified according to Article 10 of 89/686/EEC PPE Directive
•
EC Certified according to 2014/68/UE PED Directive
USE

•
Escape device;
•
Airline back-up device through SWOV automatic switch over valve.

نقد و بررسی‌ها

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