PSS BG 4 Service Manual
Draeger Safety, Inc.
Checking the Constant Dosage Valve
1 Set “positive pressure pumping”.
2 Continue pumping until the breathing bag has
inflated.
4 While pumping, fit the open side of the
sealing cap over the tappet of the relief valve
and hold it tightly until it is pressed into
position by the inflated breathing bag.
1 Set “Dosage 0.5 - 2 L/min”.
3 Read off the measured dosage value on the
red scale as soon as the pointer has stopped
moving. The constant metering quantity
should lie between 1.5 an 1.9 L/min
1)
.
Checking the Minimum Valve
1 Set “negative pressure pumping”.
The breathing circuit is vented automatically.
2 The venting process can be speeded up by
pumping.
3 Remove the sealing cap from the relief valve.
2 Carry on pumping slowly until
4 the minimum valve in the breathing bag is
heard to open = hissing sound.
5 Watch the pressure gauge:
the minimum valve should open at a value
between 0.1 and 2.5 mbar.
1)
Only applies with cylinder pressure 180 to 200 bar
or
2600 to 3000 psi (CP/AP)
Draeger Training 11/16 rev 1
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