B800-00-880 Issue D
Page 82 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Service, spares and accessories
7.4.4 BX bakeout band
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.
Note: The bakeout band is only for use with CF variants
7.4.5 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 by the 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 can be used with any suitable NW10 flanged port on the vacuum system.
TAV5 is suitable for smaller vacuum systems. TAV6 has a higher conductance and is suitable for larger vacuum systems
(typically with volume greater than 10 litres).
7.4.6 VRX vent restrictor
Use a VRX fixed orifice vent restrictor to restrict flow of vent gas into the pump. A VRX vent restrictor can be fitted
to the inlet of a TAV5 or TAV6 vent valve or to a PRX10 purge restrictor. Refer to Table 20 for information on the
selection of the correct VRX vent restrictor and to Table 42 for the item numbers of the vent restrictors available.
Table 40 - BX bakeout band
Bakeout Band Item Number For use with
BX250 (110 V) B580-52-041 nEXT240
BX250 (240 V) B580-52-061 nEXT240
BX300 (110 V) B800-00-814 nEXT300
BX300 (240 V) B800-00-816 nEXT300
BX450 (110 V) B580-52-043 nEXT400
BX450 (240 V) B580-52-063 nEXT400
Table 41 - TAV vent valve and vent port adaptor
Product Orifice Diameter Item Number
TAV5 vent valve 0.5 mm B580-66-010
TAV6 vent valve 1.0 mm B580-66-020
Table 42 - Vent restrictors
Vent restrictor Orifice diameter (mm) Item number
VRX10 0.1 B580-66-021
VRX20 0.2 B580-66-022
VRX30 0.3 B580-66-023
VRX50
0.5 B580-66-024
VRX70
0.7 B580-66-025
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