CareFusion LTV 1200 Service Manual page 188

6) Remove the 2 screws from the body of the flow valve.
7) Lift the flow valve up and out of the ventilator case.
8) Disconnect the bypass tubing from the connector at the base of the flow valve.
Flow Valve Cleaning Procedure
In certain cases, dust and other particulates may gather on the Poppet of the Flow Valve.
This can lead to a slight decrease in flow, and therefore delivered volume, which is most
noticeable when the calculated peak flow (Vcalc) is relatively low (< 30 LPM). In these
situations, cleaning of the Flow Valve poppet is an acceptable repair action.
1) Position the Flow Valve Assembly as in FIGURE 1.
2) Press and hold the Flow Valve Push Rod inward at the rear of Flow Valve Assembly,
such that the Flow Valve Poppet is positioned as far towards the step motor as allowed.
3) Use a non-metallic object, such as a wood handled cotton tip applicator, to insert a .75" X
6.75" (approximate dimension) alcohol saturated, lint free wipe into the gap between the
poppet and the seat (FIGURE 1).
NOTE
Appropriate width strips may be cut from a single wipe and moistened, if necessary, with
Isopropyl Alcohol (Isopropanol, 2-Propanol) of better than 90% purity.
p/n 18603-001, Rev. J
®
LTV 1200, 1150, and 1100 Ventilator Service Manual Page 8-67