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Absolute Vacuum Services Limited are Vacuum Pump Specialists For The Following Vacuum Pump Manufacturers:
Alcatel Vacuum Becker vacuum Busch Vacuum Edwards Vacuum Formerly BOC Edwards Vacuum Leybold Vacuum Pfeiffer vacuum Stokes pumps Varian vacuum

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Absolute Vacuum Services Ltd present the Edwards Vacuum ® range of vacuum pump products
Absolute Vacuum is a non-affiliated reseller of Edwards Vacuum ® products

Turbo vacuum pumps: Edwards (formely known as BOC Edwards) turbomolecular vacuum pumps

Edwards vacuum (formerly BOC Edwards) Turbomolecular pumps: Edwards EXT Accessories - for Edwards EXT turbo pumps

Edwards (formerly BOC Edwards) Vacuum - Turbo pumps and accessories

EXT turbomolecular pumps

EXT75DX compound turbomolecular pump
EXT255DX compound turbomolecular pump
EXT255H compound turbomolecular pump
EXT406PX compound turbomolecular pump
EXT556H compound turbomolecular pump

Turbomolecular pump controllers

Edwards Vacuum: EXC controllers
Edwards Vacuum: TIC turbo controller
Edwards: TIC turbo & instrument controller

EXT accessories

Edwards EXT accessories
EXT pump to controller cable
EXT ACX air-cooler
EXT BX bakeout band
EXT PRX10 purge-restrictor
EXT TAV vent-valve
EXT Vent-port adaptor
EXT Vibration isolator
EXT VRX vent-restrictor
EXT turbo pump spares

EXPT combined outfits

Edwards EXPT 1 &2 pumping stations

STP magnetically levitated turbomolecular pumps and accessories

Edwards Vacuum - STP turbo pumps
STP-XA4503C turbomolecular pump
STP-iX455 turbomolecular pump
STP301/STP301C turbomolecular pump
STP-L301/STP-L301C turbomolecular pump
STP603/STP603C turbomolecular pump
STP1003/STP1003C turbomolecular pump
STPH301C high performance turbo pump
STPH451C high performance turbo pump
STPA803C "advantage" turbo pump
STPA1303C "advantage" turbo pump
STPA1603C turbomolecular pump
STPA2203C "advantage" turbo pump
STP-XA2703C turbo pump
STP-XA3203C turbo pump

Edwards turbo molecular pumps (turbo vacuum pumps) overview, information and definitions

Edwards Vacuum EXT accessories and spares, for Edwards EXT turbo pumps

Edwards EXT accessories and spares, for Edwards EXT turbo pumps: we offer a complete range of accessories and spares for the Edwards EXT turbo pumps, as detailed below.

Edwards Vacuum EXT accessories and spares - dimensions

Edwards Vacuum EXT accessories and spares, for Edwards EXT turbo pumps

1 Vibration isolator
2 BX Bakeout band
3 Inlet-flange seal
(supplied with pump)
4 Inlet-screen (supplied with pump)
5 EXT pump
6 Purge port (NW10 adaptor fitted) vent-valve)
7 PRX10 purge-restrictor 13 Bakeout band position
8 Water-cooler (supplied with pump
9 ACX air-cooler (design varies with pump)
10 NW10 vent-port adaptor
11 TAV vent-valve
12 Vent-port (pump supplied with manual

Edwards Vacuum EXT: Pump-to-controller cable

A pump-to-controller cable must be ordered separately for EXC100E & EXC250E and is available in 1, 3 and 5 m lengths, to suit your installation, (other lengths are available on request).

Product description Order No.
1 m cable D39618010
3 m cable D39618030
5 m cable D39618050

Edwards Vacuum EXT: ACX air-cooler

An ACX air-cooler is used to cool an EXT pump when a suitable coolingwater supply is not available or for an EXT pump in a mobile pumping system. The ACX air-cooler is an enclosed electrical fan and fixing bracket assembly which is easily fitted to bolt holes in the base of the pump.

The ACX air-cooler has a 24 V d.c. motor which can be powered and controlled from a rear panel socket on the EXC/TIC Controller or DX pump. It is supplied with 3 m of electrical cable.

Product description   | To fit pumps   | Order No.
ACX75   | EXT75DX   | B58053075
ACX250H   | EXT255H, EXT255DX   | B58053160
ACX555H | EXT556H | B58053561

Edwards Vacuum EXT: BX bakeout band

Use a BX bakeout band to increase the rate of degassing of the pump body to achieve faster pump down and lower ultimate pressure. Bakeout bands are only fitted to CF flanged pumps and/or intended for use in ultra high vacuum systems. Bakeout bands are available for use with 110-120 or 220-240 V a.c. electrical supplies and can be powered from a rear panel socket on the EXC/TIC Controller or DX pump. It is supplied with 3 m cable and mating CE22 connector.

Product description | To fit pumps | Order No.
BX70, 110 V, 30 W | EXT75DX | B58052040
BX70, 240 V, 30 W | EXT75DX | B58052060
BX250, 110 V, 60 W | EXT255H, EXT255DX | B58052041
BX250, 240 V, 60 W | EXT255H, EXT255DX | B58052061
BX501, 110 V, 100 W | EXT556H | B58052044
BX501, 240 V, 100 W | EXT556H | B58052064

Edwards Vacuum EXT: PRX10 purge-restrictor

The PRX10 purge-restrictor is used to set the flow-rate of purge gas into the EXT pump. All of the EXT pumps have a purge-port to allow you to purge the motor and bearing cavity with dry nitrogen or another inert gas. Fit a vent-port adaptor to the purge-port of the EXT255H or EXT255DX pumps to convert it from !/8 inch BSP to DN10NW, before you use the PRX10.

Product description | Order No.
PRX10 purge-restrictor | B58065001

Edwards Vacuum EXT: TAV vent-valve

The TAV vent-valves are 24 V d.c. solenoid operated valves which you can use to vent your vacuum system with atmospheric air or dry nitrogen when you switch off the EXT pump. The valves are supplied with a sintered bronze inlet-filter, a riffled hose connector, 3 m of electrical cable and a DN10NW adaptor. The vent-valves can be powered and controlled from a rear panel socket on the EXC Controller. You can either use your TAV vent-valve to replace the manual vent-valve supplied with the EXT pump, or adapt it to fit any other suitable port on the vacuum system upstream of the turbomolecular pump. For further advice about the choice of TAV vent-valve, see page 2-3.

Edwards vacuum EXT: TAV vent valve dimensions

Edwards Vacuum EXT: TAV vent-valve

Product description | Order No.
TAV5 vent-valve | B58066010
TAV6 vent-valve | B58066020

Edwards Vacuum EXT: Vent-port adaptor

This !/8 inch BSP male to DN10NW adaptor can be used to replace the TAV5 vent-valve or the manual vent-valve fitted to the EXT pumps. It allows the threaded vent-port on the pump (and the threaded purge-port on the EXT255H and EXT556H) to be converted to a DN10NW flange. The vent-port adaptor is supplied with a removable flow-restrictor and an O-ring to seal the adaptor to the pump.

Product description Order No.
Vent-port adaptor B58066011

Edwards Vacuum EXT: VIbration isolator

A vibration isolator can be fitted to the inlet-flange of the EXT pump to reduce the transmission of the small amount of vibration generated by the pump to your vacuum system. The vibration isolator has two flanges separated by a flexible stainless steel bellows and an outer rubber anti-vibration collar. The vibration isolator is designed for use with vertically mounted pumps only.

To fit pump | Order No.
DN63CF | B58101000
DN63ISO-K | B58115000
DN100ISO-K | B58120000
DN160ISO-K | B58125000
DN100CF | B58105000
DN160CF | B58110000

Edwards Vacuum EXT: VRX vent-restrictor

Fit a VRX vent-restrictor to your EXT pump if you will vent the pump when the pump speed is above 50% of full rotational speed. The vent-restrictor restricts the flow-rate of the vent gas into the EXT pump. You can also use the VRX to replace the standard restrictor supplied with the PRX10 purge restrictor to obtain a different purge rate. You can fit the vent-restrictor to the TAV vent-valve, to the vent-port adaptor or directly to the vent or purge port of the EXT255H and EXT255DX pumps.

VRX vent-restrictor Orifice diameter (mm) Order No.
VRX10 0.1 B58066021
VRX20 0.2 B58066022
VRX30 0.3 B58066023
VRX50 0.5 B58066024
VRX70 0.7 B58066025

Edwards vacuum EXT turbo pump spares

Each EXT pump is supplied with an inlet seal, inlet screen and water cooler (with the exception of DX pumps). These items may also be ordered as spares.

Edwards EXT turbo pump spares - ordering information
Product Description	Turbo pump type	To fit inlet flange size	Order No.
Inlet flange seals DN40NW Co-Seal, fluoroelastomer DN50NW Co-Seal, fluoroelastomer ISO63 Trapped O-ring, fluoroelastomer ISO100 Trapped O-ring, fluoroelastomer ISO160 Co-Seal, fluoroelastomer 63CF copper compression gasket (pack of 10) 100CF copper compression gasket (pack of 10) 160CF copper compression gasket (pack of 5)			B27158453 B27158466 B27158170 B27158171 B27158074 C10007490 C10009290 C10011290
ISX inlet-screen ISX100/6 ISDX63/4 ISHX160/8C ISHX160/8F	EXT255H, EXT255DX EXT75DX EXT556H (coarse) EXT556H (fine)	DN100ISO-K, DN100CF DN63ISO-K, DN63CF DN160ISO-K, DN160CF DN160ISO-K, DN160CF	B58051001 B72240860 B58051007 B58051008
WCX water-cooler WCX250M WCX250 WCX555H	EXT255H, EXT75DX, EXT255DX EXT556H		B73501164 B73600121 B58067003