Advertenties
The shut-off valve´s open/close status indicator is for guidance only. The shut-off valve may
not be fully off when OFF status is showing. Fully closed status has to be checked by ensuring
the shut-off valve is turned fully clockwise until a firm resistance to the rotation is reached and
gas supply to the outlets has stopped.
The shut-off valve must not be used in the "partly ON" status because even though gas is
supplied to the outlets, the flow can be limited due to an insufficiently opened shut-off valve.
EN
E – RESIDUAL PRESSURE DEVICE
The combination valve is equipped with a residual pressure device (RPD) with a function to
retain a minimum positive pressure in the gas cylinder to avoid contamination of the cylinder.
During cylinder gas venting/evacuation through the filling port using a specific filling adapter
the residual pressure device is bi-passed.
F, G – FLOW CONTROL HEAD "F" AND FLOW OUTLET "G" (OPTIONAL)
The combination valve may be fitted with a flow control head "F". This function is used to supply
gas flow rates (l/min) at atmospheric pressure directly to a patient through the flow outlet "G",
a range of selectable flow rates are provided. The flow outlet is connected with a cannula
tube to a provide gas to a patient either through a nasal cannula outlet or facemask. The flow
rate selected is shown by the value identified by the triangular pointer. The flow outlet "G" is
equipped with a hose fitting (hose nipple) or a threaded type (for related medical devices to
be connected via threaded connection). Movement of the flow outlet 'G' is normal due to the
method of fixing in the main body. It doesn't indicate a faulty flow outlet.
H – PRESSURE OUTLET OR QUICK COUPLER (OPTIONAL)
The combination valve may be fitted with a pressure outlet. The pressure outlet is supplied with
gas direct from the low-pressure part of the combination valve and it is fitted with a gas specific
medical quick coupling connector also called "quick coupler". The user can connect another
piece of equipment to this outlet with a gas specific male probe The quick coupler self-seals
when the male probe is disconnected. This outlet is for supplying gas to other medical devices.
I - LOW PRESSURE RELIEF VALVE
The pressure relief valve provides protection from overpressure of the low-pressure part of the
combination valve and connected medical devices. The low pressure relief valve vents gas if
an overpressure scenario occurs until the gas pressure returns to normal conditions when it
shall deactivate.
J - EXCESS FLOW DEVICE OR ANTI-DUST TUBE (OPTIONAL)
An excess flow device provides additional protection if the main part of the combination valve is
sheared off above the inlet stem. The excess flow device activates in such situations to reduce
the flow out of the inlet stem.
An anti-dust tube may be provided, its main function is to avoid contaminations within the gas
cylinder entering the combination valve. It provides this function by collecting the gas at a more
centralised position than the inlet stem provides and by a reduced aperture. The excess flow
device also provides a contamination protection function. An anti-dust tube does not provide
the same flow limiting function as an excess flow device.
PRESSURE RELIEF DEVICE OF HIGH PRESSURE PART - BURSTING DISC (OPTIONAL)
A high pressure relief device is intended to protect the cylinder and high-pressure part of the
combination valve against damage caused by increased cylinder pressure. If the bursting disc
has been activated, it does not reseal, and the combination valve must be taken out of service
for repair (see Chapter 10).
GUARD (OPTIONAL)
A guard may be supplied as an integral part of the combination valve. The guard consists of two
halves assembled together to the gas cylinder.
Note: Colour of the medical device (especially guard, flow control head and shut-off valve)
does not have to match the gas colour coding.
For manipulation use only the guard handle. Do not use other parts of the valve as handle.
5/443
Advertenties
