Edwards B777-51-000, Instruction Manual, Page: 38 / 40

B777-50-880 Issue D
Page 32 © Edwards Limited 2013. All rights reserved.
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Service, spares and accessories
7.4.5 BX bakeout band (conflat only)
A BX bakeout band accelerates the degassing of the pump to enable it to achieve lower pressures. It may also be used
to protect the pump from condensation of contaminants. The bakeout bands are available in 110-120 V or 220-240 V
versions and may be powered from a rear panel socket on the EXC Controller.
7.4.6 FL20K foreline trap
The foreline trap minimises oil vapour backstreaming from the backing pump and is recommended where the highest
system cleanliness is required.
7.4.7 TAV vent-valve and vent-port adaptor
Two solenoid operated vent valves are available for system venting. The valves are 24 V d.c., normally-open, and
can be driven automatically from the EXC Controller. The solenoid valve is fitted in place of the manual valve, or
alternatively can be fitted with an adaptor (supplied with the valve) and be used with any suitable NW10 flanged port
on the vacuum system
The vent-port adaptor allows the vent-port or the purge-port to be used with any suitable NW10 fitting: refer to
Figure 6 .
7.4.8 ACX air-cooler
An ACX air-cooler can be fitted to the EXT pump. However, please refer to Section 3.7 and to Table 5 to check the
suitability of air-cooling in a particular application.
Table 14 - BX bakeout band
Pump Bakeout band Item Number
EXT556H/HF DN160CF BX501 (110 V) B580-52-044
BX501 (240 V) B580-52-064
Table 15 - FL20K foreline trap
Foreline trap Item Number
FL20K A133-05-000
Table 16 - TAV vent-valve and vent-port adaptor
Product Item Number
TAV5 vent-valve B580-66-010
TAV6 vent-valve B580-66-020
NW10-1/8 inch BSP male adaptor B580-66-011
Table 17 - ACX air-cooler
Pump Air-cooler Item Number
EXT556H/HF ACX555 B580-53-561