6.6.2 Clean and refit the check-valve (if fitted)
Note: This requires a check valve service kit. Refer to Section 8.3.
1. Refer to Figure 6-4. Unscrew the two halves (2, 4) of the check-valve body (if necessary, use a
strap wrench, then remove the ball (3) and the 'O' ring (6).
2. Use a cleaning solution suitable for the deposits to clean the valve body and the ball. If
necessary, replace the fluoroelastomer ball.
3. Inspect the 'O' ring groove and the flange sealing-faces for damage; refinish if necessary.
4. Position the new ‘O’ring in its groove in the valve body.
5. Ensure that the ball (3) is correctly positioned in the valve body, then screw the two halves of
the valve body (2, 4) together.
6. Refer to Figure 1-1. Use a new trapped ‘O’ ring (not supplied) and clamp (removed in
Section 6.6.1) to secure the check-valve (18) to the elbow (20). Ensure that the flow arrow on
the check valve (Figure 6-4, item 7) points away from the elbow towards the exhaust
extraction system.
7. See Figure 1-1. Refit the exhaust enclosure (26) using the screws connecting to the rear
bulkhead cover, drip tray (27) and exhaust enclosure top plate.
8. Use a new trapped 'O' ring (not supplied) and the NW40 clamp (removed in Section 6.6.1) to
secure the check-valve outlet to the exhaust-extraction system.
iH Dry Pumping Systems 6-7
1. Exhaust pipe insulation jacket
2. Support bracket assembly
3. Insulation jacket tab
4. Exhaust pipe
5. NW40 clamp
6. Elbow
7. Elbow insulation jacket
8. Clamps insulation jacket
9. Plastic wing nut
Figure 6-3 - Fit insulation jackets
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