© Edwards Limited 2008. All rights reserved. Page 35
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Service, spares and accessories
B722-20-880 Issue D
7.4.4 FL20K foreline trap
The foreline trap minimises oil vapour backstreaming from the backing pump and is recommended where the highest
system cleanliness is required.
7.4.5 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. 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 your vacuum system.
The vent-port adaptor allows the vent-port (or the purge-port, on EXT255H pumps) to be used with any suitable NW10
fitting: see Figure 7, item 7.
7.4.6 ACX air-cooler
An ACX air-cooler can be fitted to the EXT pump. However, please refer to Section 3 to check the suitability of air-
cooling in a particular application.
7.4.7 Vibration isolators
In applications where the small amount of vibration generated by the turbomolecular pump is a problem, a vibration
isolator can be fitted. The isolator consists of two special flanges separated by a flexible bellows and a rubber, anti-
vibration, outer collar. The isolator required depends on the pump inlet-flange size.
7.4.8 PRX purge-restrictor
The PRX10 is a modified DN10NW centring-ring which filters the purge gas and restricts its flow rate to the
recommended flow of 25 sccm. The restrictor is suitable for all EXT pumps fitted with a purge-port.
Note that you must fit a vent-port adaptor (see Section 7.4.5) to the purge-port on an EXT255H 24V or EXT255Hi 24V
pump, in order to connect the purge restrictor to the pump.
Foreline trap Item Number
FL20K A133-05-000
Product Item Number
TAV5 vent-valve B580-66-010
TAV6 vent-valve B580-66-020
Vent-port adaptor B580-66-011
Pump Air-cooler Item Number
EXT70H/Hi 24 V ACX70 B580-53-050
EXT255H/Hi 24 V ACX250H B580-53-160
Inlet-flange size Item Number
DN63ISO-K B581-15-000
DN63CF B581-01-000
DN100ISO-K B581-20-000
DN100CF B581-05-000
Purge-restrictor Flange size Item Number
PRX10 NW10 B580-65-001
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