B722-20-880 Issue D
Page 36 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Service, spares and accessories
7.4.9 VRX vent-restrictor
Use a VRX fixed orifice vent-restrictor to restrict the flow of vent gas into the EXT pump. You can fit a VRX vent-
restrictor to the inlet of a TAV5 or TAV6 vent-valve or to a PRX10 purge-restrictor. Refer to Section 3.4 for
information on the selection of the correct VRX vent-restrictor.
7.4.10 EXT70H/ISO63 interstage-port accessory kit
On the EXT70H/ISO63 24 V pump, the interstage-port in the pump-envelope is blanked off. You can remove the
blanking cap and fit the interstage-port accessory to upgrade the pump to an EXT70Hi pump, so that you can use the
interstage-port of the pump as described in Section 3.3.4.
The accessory kit consists of an ‘O’ ring and a flange; the flange has an inlet strainer to prevent the entry of debris
into the pump. To fit the accessory:
z Use a suitable pin-spanner to remove the blanking plug from the interstage-port. The holes in the blanking
plug are 3.2 mm in diameter, and the centres of the holes are 14 mm apart.
z Fit the ‘O’ ring supplied, then use a 27 mm diameter ‘C’ spanner to screw the flange into the interstage-
port; the holes in the flange accessory are 3.2 mm in diameter.
z Tighten the flange sufficiently, to prevent the flange being loosened by vibration or stress transmitted from
pipelines connected to the flange.
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
Accessory Item Number
EXT70H/ISO63 interstage-port accessory kit B580-69-001
Pin-spanner B279-29-029
27 mm ‘C’ spanner B279-29-028
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