A750-04-880 Issue F
Page 20
© Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
INSTALLATION
Figure 1 - Recommended sealing liquid and seals flush supply system configurations: sheet 2 of 2
1. External seals flush supply *
Ø
2. Seals flush supply valve
Ø
3. Seals flush pressure switch
† Ø
4. Sealing liquid seals flush supply pipeline
* Ø
5. Seals flush flow switch
§ Ø
6. Seals flush pipelines
# Ø
7. Priming/drain valve
8. Liquid ring pump
9. Liquid ring supply pipeline
10. Sealing liquid supply flow indicator
11. Temperature gauge
12. Flow regulating valve
13. Cooler
14. Sealing liquid reservoir
15. Float operated fill/top-up valve
16. Liquid ring supply valve
17. Liquid ring supply
18. Level switch
‡ Ø
19. Discharge outlet/vent
20. Overflow
21. Pump outlet pipeline
22. Outlet temperature gauge
23. Temperature transmitter
¤
24. Non-return valve
25. Pump inlet
26. Pressure gauge
A. Total recirculation system
B. Partial recirculation system
C. Once-through system
*
Alternative options.
Ø Only applicable to ATEX Category 1 and 2 pumps configured for external seals flush supplies; on
ATEX Category 2 pumps configured for internal seals flush supplies, the seals flush supplies are
provided internally from the sealing liquid ring.
† Mandatory safety device on ATEX Category 1 and optional safety device on ATEX Category 2
pumps configured for external seals flush supplies where the seals flush supplies are not
provided from a sealing liquid reservoir.
§ Mandatory safety devices on ATEX Category 1 and 2 pumps configured for external seals flush
supplies.
# There are two seals flush pipelines: one for each seal in the pump.
‡ On ATEX Category 1 and 2 pumps configured for external seals flush supplies fitted with total and
partial recirculation systems, this is an optional safety device if the seals flush supplies are
provided from the sealing liquid reservoir.
¤ Mandatory safety device on ATEX Category 1 pumps and ATEX Category 2 pumps which use a
sealing liquid which has a boiling point higher than 100
o
C and total recirculation systems.
