Edwards DRYSTAR GV Series, Instruction Manual

Page: 40 / 58

A705-74-880 Issue K
Page 34 © Edwards Limited 2009. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
MAINTENANCE
1. Refer to Figure 8 . If a nitrogen gas-ballast supply is connected, continue at Step 4; otherwise continue at Step 2
to inspect the air filter.
2. To inspect the air filter (11), twist the top half of the housing clockwise to release. If there are excessive
deposits lodged in the filter element, replace with a new one.
3. Refit the housing half and twist to the left until it clicks into the sealed position.
4. Inspect all of the clamps (3, 6 and 9) in the gas-ballast system and check that they are secure. Tighten any loose
connections.
5.6 Inspect the pipelines and connections
1. Inspect all cooling-water pipelines and connections; check that they are not corroded or damaged. Replace any
of the pipelines and connections that are corroded or damaged. Check that all cooling-water connections are
secure. Tighten any connections that are loose.
2. Inspect all air or nitrogen supply pipelines and connections; check that they are not corroded or damaged.
Replace any pipelines and connections that are corroded or damaged. Check that all air or nitrogen supply
connections are secure. Tighten any connections that are loose.
3. Inspect all electrical cables; check that they are not damaged and have not overheated. Replace any cables that
are damaged or have overheated. Check that all electrical connections are secure. Tighten any connections that
are loose.
4. Inspect all process and exhaust pipelines; check that they are not corroded or damaged. Replace any pipelines
that are corroded or damaged. Check that all process and exhaust connections are secure. Tighten any
connections that are loose.
5.7 Inspect the interstage relief (GV410 and GV600 pumps only)
If the interstage relief valve does not operate correctly, use the following procedure to inspect it.
1. Refer to Figure 9 . Remove the four M8 bolts (11) which secure the retainer (9) to the exhaust manifold (3).
2. Fit two of the bolts (11) into the jacking holes (10) and tighten the bolts to remove the retainer (9) from the
exhaust manifold (3).
3. Remove the flap-valve (7) from the exhaust manifold (3).
4. Inspect the valve:

If the retainer (9) or valve body (2) are damaged or corroded, you must replace the interstage relief valve:
refer to
Section 5.12 .

If the flap-valve (7), hinge bushes (1) or the valve O-ring (6) are damaged, replace the damaged
component(s).
5. Clean the inside of the exhaust manifold (3) to remove any deposits; if necessary, use a suitable cleaning
solution. If you use a cleaning solution, ensure that all of the solution is removed before you fit the new
interstage relief valve components.
6. Inspect the O-rings (4, 5, 8) and, if necessary, fit new O-rings.
7. If necessary, refit the two-hinge bushes (1) to the valve flap (7), then fit the valve flap to the valve body (2).
8. Refit the valve body (2) in the exhaust manifold (3).
9. Fit the retainer (9) to the exhaust manifold (3) and secure with the four bolts (11). Tighten the bolts to a torque
of 10 Nm.