Datex-Ohmeda Aestiva 7900 SmartVent, Technical Reference Manual

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7 Repair Procedures
7-22 05/04 1006-0453-000
7.10.2 To service the MOPV assembly with the molded housing:
Note: Refer to Figure 7-20 for the following steps.
1. Remove the two screws and lift off the housing.
2. Remove the over pressure weight and seal assembly.
3. Replace the seal of the over pressure weight.
4. Remove the differential pressure weight and diaphram.
5. Replace the o-ring over the center hole in the plate.
6. Place the diaphragm (item 6) and the differential-pressure weight (item 5)
over the corresponding seat in the manifold plate.
7. Place the over-pressure weight and seal assembly (items 3 and 4) over the
corresponding seat in the manifold plate.
8. Place the molded housing over the weights so that the locating tabs are
within the recess of the manifold plate and that it lies flat against the
manifold plate.
Important: Ensure that the diaphragm (item 6) is not
pinched by the housing.
9. Start both housing mounting screws in the threaded holes.
10. Ensure that the locating tabs are still positioned in the recess of the
manifold plate and that the diaphragm is not pinched, and then, tighten
the mounting screws.
11. Install the Vent Engine by following the steps in Section 7.6 in reverse
order.
12. Perform the Checkout Procedure found in Section 3 of the Aestiva
Anesthesia Machine Service Manual.
Figure 7-20 • Mechanical Overpressure Valve, molded housing
2
5
6
3
4
7
1
AB.23.168
1. Housing Screws
2. Housing
3. Over pressure weight
4. Seal, over pressure
5. Differential pressure weight
6. Diaphram, differential pressure
7. O-ring