PSS
®
is a registered trademark of Dräger. Dow Corning
®
and Molykote
®
are registered trademarks of Dow Corning Corporation 3360562 (A3-D-P)
1 For your safety
1.1 General safety statements
● Before using this product, carefully read the Instructions for
Use.
● Strictly follow the Instructions for Use. The user must fully
understand and strictly observe the instructions. Use the
product only for the purposes specified in the Intended Use
section of this document.
● Do not dispose of the Instructions for Use. Ensure that they are
retained and appropriately used by the product user.
● Only fully trained and competent users are permitted to use
this product.
● Comply with all local and national rules and regulations
associated with this product.
● Only trained and competent personnel are permitted to
inspect, repair and service the product. Dräger recommend a
Dräger service contract for all maintenance activities and that
all repairs are carried out by Dräger.
● Properly trained service personnel must inspect and service
this product as detailed in the Maintenance section of this
document.
● Use only genuine Dräger spare parts and accessories, or the
proper functioning of the product may be impaired.
● Do not use a faulty or incomplete product, and do not modify
the product.
● Notify Dräger in the event of any component fault or failure.
1.2 Definitions of alert icons
Alert icons are used in this document to provide and highlight text
that requires a greater awareness by the user. A definition of the
meaning of each icon is as follows:
WARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, could result in physical injury or damage to the
product or environment. It may also be used to alert against
unsafe practices.
2 Description
2.1 Product overview
Dräger lung demand valves are high-performance valves that
control the breathing air supplied into the mask of a breathing
apparatus wearer. The lung demand valve connects the medium-
pressure supply from the breathing apparatus to the mask, and a
sealed and balanced piston unit inside the valve controls the
quantity of air flow through the valve in response to the wearer’s
breathing demand.
Lung demand valves are either integral or removable. Integral
variants have a medium-pressure hose with a pneumatic end
fitting that connects to the breathing apparatus pressure reducer.
Removable variants have a male quick coupling that connects to
a female quick coupling on the breathing apparatus medium-
pressure hose.
Lung demand valves are positive-pressure or negative-pressure
(see Section 2.1.2), and some variants have a manually operated
supplementary air supply (see Section 2.1.4).
2.1.1 Lung demand valve to face mask coupling
The lung demand valve to face mask coupling types are shown in
the table below:
Lung demand valve couplings have a swivel feature at the face
mask to allow radial movement of the valve without leaking during
head and body movement of the wearer.
Lung demand valve connection and disconnection methods
● N-type connect/disconnect (see Fig A)
● AE-type connect/disconnect (see Fig B)
● A-type connect (see Fig C)
● A-type disconnect (see Fig D)
● ESA-type connect (see Fig E)
● ESA-type disconnect (see Fig F)
2.1.2 Positive-and negative-pressure valves
Negative-pressure
A negative-pressure valve allows air to flow through the lung
demand valve when a negative-pressure occurs inside the mask
during wearer inhalation. The pressure in the mask is at times less
than external (atmospheric) pressure.
A negative-pressure lung demand valve is activated on each
breath (each inhalation from the breathing apparatus by the
wearer).
Positive-pressure
A positive-pressure valve maintains a greater pressure than
atmospheric inside the mask. Although the pressure drops as the
wearer inhales, the pressure inside the mask remains above
atmospheric.
A positive-pressure lung demand valve is activated by first breath
(first inhalation from the breathing apparatus by the wearer) or by
pressing the front button (Fig G, Item 2). Once activated, positive-
pressure valves have a reset button (Fig G, Item 1) to switch off
the flow of air through the valve to prevent exhausting the cylinder
air when not being worn.
2.1.3 Special use lung demand valves
Lung demand valves with a green rubber cover at the reset button
(Fig G, Item 1) indicate that the valve contains a non-silicone
diaphragm. The non-silicone diaphragm has a greater permeation
resistance than a silicone diaphragm. This is suitable for use in
environments containing vapours and gases such as H
2
S –
hydrogen sulphide.
Contact Dräger for further details about diaphragm types and
operating environments.
2.1.4 Supplementary air flow
Some lung demand valve variants are able to provide
supplementary air flow into the face mask to clear a misted visor
or to provide a temporary increased air supply. The supplementary
air flow can be activated by pressing the front button (Fig G,
Item 2).
This functionality is not present in lung demand valves used with
dedicated escape breathing apparatus.
WARNING
Do not use the supplementary air flow with self-contained
breathing apparatus that are not connected to an airline
unless it is essential. The supplementary air flow
decreases the breathing time from the air cylinder.
2.2 Intended use
Dräger lung demand valves are used with Dräger breathing
apparatus to protect the wearer when working in a contaminated
or oxygen-deficient atmosphere.
Dräger recommend that only Dräger face masks be used with
Dräger lung demand valves to guarantee trouble-free operation.
2.3 Approvals
The European standards, guidelines, and directives according to
which this product is approved are specified in the declaration of
conformity (see declaration of conformity or www.draeger.com/
product-certificates).
2.4 Explanation of marking and symbols
Examples of marking on the lung demand valve:
BRCD-1461 Dräger serial number
P Positive-pressure
N Negative-pressure
09/09 Month and year of manufacture
3356812 or R21034 Dräger part number
Barcode of serial number
The reset button cover (Fig G, Item 1) is colour-coded to indicate
the lung demand valve properties:
● Blue – silicone diaphragm, negative-pressure
● Red – silicone diaphragm, positive-pressure
● Green– non-silicone diaphragm
3 Use
The preparation for use and during use instructions are detailed in
the breathing apparatus instructions for use.
3.1 Before use
For breathing apparatus with a medium-pressure coupling,
disconnect and then reconnect the male coupling. To connect,
press the male coupling into the female coupling until an audible
click is heard. If there is any difficulty disconnecting or connecting,
see the troubleshooting information in the breathing apparatus
instructions for use.
3.2 Connecting lung demand valve to face mask
1. Ensure the lung demand valve coupling and face mask
connection are clean and undamaged.
2. Connect the lung demand valve to the face mask:
○ Types N and AE: screw the lung demand valve into the face
mask connection hand tight.
○ Types A and ESA: push the lung demand valve into the
face mask connection, rotating the lung demand valve
slightly if necessary, until it clicks into place.
3. Check that the lung demand valve is securely retained by
attempting to gently pull the coupling apart.
4. If required by local regulations, have a second person verify
that the connection is firm and correct.
4 Troubleshooting
See the breathing apparatus Instructions for Use.
5 Maintenance
5.1 Maintenance table
Dräger recommend that regular inspection, testing and servicing
of the lung demand valve is carried out in accordance with the
table below.
Additional maintenance may be required in the country of use to
ensure compliance with national regulations governing the use,
maintenance, examination and testing of this product.
Lung
demand
valve
coupling
Face
mask
coupling
Apparatus type Coupling type
N RA Negative-pressure Screw-in – 40 mm round
thread to EN 148-1
AE PE Positive-pressure Screw-in – M45 × 3 to
EN 148-3
A P Positive-pressure Push-in – Dräger specific
ESA ESA Positive-pressure Push-in – DIN 58600 and
EN 136/137
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