A533-23-880 Issue C
Page 94 © Edwards Limited 2009. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
maintenance
Figure 47 - Dismantle and clean the silencer
6.6.2 Clean the check-valve
Note: This requires a check valve service kit. Refer to Section 8.3.
1. Refer to Figure 49. Unscrew the two halves (2, 4) of the check-valve body (if necessary, use a strap wrench, then
remove the fluoroelastomer ball (3) and the 'O' ring (6).
2. Use a cleaning solution suitable for the deposits to clean the valve body and the fluoroelastomer ball. If
necessary, replace the fluoroelastomer ball.
3. Inspect the 'O' ring groove and the flange sealing-faces for damage; re-finish if necessary.
4. Position the new ‘O’ring in its groove in the valve body.
5. Ensure that the fluoroelastomer ball (3) is correctly positioned in the valve body, then screw the two halves of
the valve body (2, 4) together.
1. M5 screw
2. M5 metal washer
3. NW40 inlet flange
4. Top flange assembly
5. Inlet tube
6. Transfer tube
7. O-ring
8. O-ring groove
9. Second stage expansion chamber
10.Hot surface warning labels
11.Body
12.First stage expansion chamber
13.Outlet tube
14.NW40 outlet flange
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