Section 5 - Operation
Open Reservoir Scavenger
Adjusting the
Needle Valve
You must properly adjust the waste gas flow rate to prevent waste gas
contamination of the operating room. The needle valve wing nut
regulates the waste gas exhaust flow.
To adjust the needle valve:
1. Attach all appropriate hoses and verify that the waste gas disposal
system is active.
2. Turn the needle valve wing nut until the flowmeter indicates a flow
halfway between the two white lines etched on the scavenger’s
flowmeter. This setting corresponds to a suction flow rate of about
25 l/min.
Depending on the fresh gas flow rate, the needle valve setting may have
to be increased or decreased to settings either above or below the lines
on the flowmeter. If the suction flow rate is set too low, waste gas will
exit the canister through the relief ports around the top of the canister
and contaminate the operating room. If the suction flow rate is too high,
the waste gas disposal system’s suction capacity will be needlessly
depleted and the system will be noisy.
You may have to readjust the needle valve setting during a case. For
example, a shared suction disposal system may provide a varying suction
flow rate, depending on the number of users at any given time.
5-5-4
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