A705-61-880 Issue M
Page 36 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.9 Flush the cooling jacket
Flush the cooling jacket every year or when you think that the cooling efficiency is reduced because of deposits or
other contamination in the cooling jacket. The pressure and flow rate of the water supply that you use to flush the
cooling jacket must be equal to or higher than the normal cooling-water supply. Do not exceed the pressure specified
in Section .
1. Switch off your cooling-water supply.
2. Refer to Figure 1. Disconnect the cooling-water supply and return pipelines from the water inlet (7) and
outlet (2) connections.
3. Fit a suitable water supply pipeline to the water outlet connection (2), and fit a suitable water return pipeline
to the water inlet connection (7).
4. Turn on the water supply to flush the cooling jacket in the reverse direction, and wash out any deposits from
the cooling jacket.
5. Allow the water to flow for a few minutes, switch off the water supply, then disconnect the water return
pipeline.
6. Place a suitable splash tray under the cooling-water inlet connection (7), then unscrew and remove the
1 ¼ inch BSP water inlet fitting (that is, the large fitting to which the cooling- water inlet connection (7)
is fitted) from the port in the end of the pump.
7. Use a suitable tool to remove any sediments from the port.
8. Turn on the water supply for a short time to flush any remaining deposits from the cooling-jacket.
9. Disconnect the water supply pipeline from the cooling-water outlet connection (2), then dispose of the water
and deposits in the splash tray.
10.Apply a suitable thread sealant (such as Loctite 577) to the threads of the 1 ¼ inch BSP water inlet fitting, then
refit the fitting to the port in the end of the pump.
11.Refit your pump cooling-water supply and return pipelines to the water inlet (7) and outlet (2) connections.
5.10 Replace the interstage relief valve
You must replace the interstage relief valve if it is damaged. The interstage relief valve is available as a spare: refer
to Section 7.3.
1. Refer to Figure 7. Undo and remove the four M8 bolts (11) which secure the valve retainer (9) to the exhaust
manifold (3).
2. Place two of the bolts in the jacking holes (10) and tighten the bolts to remove the retainer (9) from the
exhaust manifold.
3. Remove the 'O' ring (8), valve flap (7), hinge bushes (1), valve body (2) and 'O' rings (5, 4) from the exhaust
manifold (3).
4. Clean the inside of the exhaust manifold 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.
If the water flow through the cooling jacket is blocked or restricted, the water in the pump may
get very hot. Allow the pump to cool down before you remove the cooling-water connections.
If you do not, hot water may be ejected from the pump and may cause injury.
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