2 Install a washer (P/N 4021) and a single cam stop (P/N 4020)
between the 5 to 7 o'clock position (trial and error). Secure the parts in place with the
(d) Rotate the valve stem fully clockwise. Pressure on the manometer
should return to +2 to +4cmH20.
(e) Apply Lubewick to the O-ring on the outside of the retention cap and
secure the control knob with its index at the OFF position.
The control knob for the expiratory-flow gradient, shown in figure 2-5, is the
only Babybird knob with the increase arrow directed counterclockwise.
Figure 2-5. Expiratory flow gradient control knob.
(f) Table 2-6 gives the problems, possible causes, and remedial
procedures used in troubleshooting the expiratory flow gradient system.
Outflow valve continuous positive airway pressure control (CPAP).
(a) Adjust the flow for 15 liters per minute.
(b) Rotate the valve's red control lever fully counterclockwise and
observe the airway manometer for a CPAP of at least 20cmH20.
(c) A flutter of the outflow-valve diaphragm may occur as reflected by
the manometer. To eliminate the flutter, remove the outflow valve diaphragm and lightly
lubricate the extension attached to the diaphragm. Use Bird special lubricant (P/N 631)
or Lubewick (P/N 042).
(d) Rotate the red control lever back to a fully clockwise position.