Dräger Narkomed 2B Operator's Instruction Manual page 25

Inspiratory and
Expiratory Valves
The absorber system permits spontaneous, manually assisted, or
automatic ventilation of the patient. The absorber incorporates a
manual/automatic selector valve, which allows you to select either
manual or automatic ventilation. An absorber with a positive end
expiratory pressure (PEEP) valve is also available.
WARNING: Waste gas scavenging systems used with North American
Dräger absorber systems must have safety features to
ensure that excessive subatmospheric pressure (lower than
-0.5 cmH
+0.5 cmH
The inspiratory and expiratory valves, labeled INSPIRATION and
EXPIRATION, respectively, control the direction of gas flow in the
absorber system. The valves are unidirectional, meaning that they
permit gas to flow in one direction only.
• The inspiratory valve allows gas to flow toward the patient only,
with no backflow to the absorber.
• The expiratory valve allows gas to flow to the absorber only, with
no backflow to the patient.
The valves are not interchangeable. They must be connected to the
correct mounts (inspiratory valve to inspiratory mount, expiratory valve
to expiratory mount) to ensure the proper flow direction through the
absorber system. Different size mounting threads on each valve prevent
connection of a valve to the wrong mount.
WARNING: Do not use the inspiratory or expiratory valve if any one of
these problems occurs:
• A pin in the valve body or plastic valve dome is bent,
damaged, or missing.
• The valve disk is missing or damaged.
• The valve seat is damaged.
O) and excessive positive pressure (higher than
2
O) are not possible at the connection point.
2
Section 2
General Description
2-13