Edwards E2MO.7 - Gas-Ballast; Figure 1 General View of the Pump

Figure 1 General view of the pump
CS/1128/A
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1. Fan cover 2. Motor terminal box
3. Handle (can be removed: see Locate the
pump on page 18)
4. NW10 inlet-port (adaptor ange)
5. Gas-ballast control
6. Oil ller-plug 7. Outlet nozzle
8. Pump/motor sha rotaon direcon
arrow
9. Oil sight-glass and bezel
10. Pump idencaon label
11. Oil drain-plug 12. Removable side panel
13. Baseplate
1. Fan cover 2. Motor terminal box
3. Handle (can be removed: see Locate the
pump on page 18)
4. NW10 inlet-port (adaptor ange)
5. Gas-ballast control
6. Oil ller-plug 7. Outlet nozzle
8. Pump/motor sha rotaon direcon
arrow
9. Oil sight-glass and bezel
10. Pump idencaon label
11. Oil drain-plug 12. Removable side panel
13. Baseplate
2.4 Gas-ballast
To pump high vapour loads, gas-ballast is delivered into the pump to prevent
condensaon of the vapour carried by the pumped gases.
Air (or another gas) can be introduced into the low vacuum stage through the gas-ballast
control. The gas-ballast control is a mul-turn valve which can be adjusted, as required,
between closed and fully open.
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A37132880_F - Introducon