© Edwards Limited 2009. All rights reserved. Page 5
Edwards and the Edwards logo are trademarks of Edwards Limited.
INTRODUCTION
A705-74-880 Issue K
1.6 Drive operation
The pump has a flexible drive coupling which transmits the drive from the pump-motor (Figure 1, item 16) to the
pump rotors.
Refer to Figure 12. A coupling hub (14) is fitted to the pump shaft (9) and a drive hub (16) is fitted to the motor shaft
(18). A coupling insert (15) fits between the coupling and drive hubs.
The drive hub incorporates a number of drilled holes. With a coupling cover (Figure 12, item 12) removed, a steel
rod can be fitted (or other suitable tool) into one of these holes, and you can then manually turn the drive shaft, and
so turn the pump. This facility is useful if, for example, you need to drain fluid from the pump following a hydraulic
lock (see Table 4).
1.7 Liquid pumping capability
The GV pump can ingest liquid streams up to 1 l/min flow rate. For a continuous pumped liquid stream you are
advised to contact your supplier or Edwards for applications advice. Liquid streams in excess of 1 l/min should to be
avoided.
1.8 Safe area operation
GV pumps must not be used in the following hazardous areas:
Zone 0, Zone 1 or Zone 2 (gases), or Zone Z (10) or Zone Y (11) (dusts), as classified by standard BS5345 Part
1.
Division 1 or Division 2 (gases and dusts), as classified by North American authorities.
These hazardous areas require the use of flameproof equipment. If a pump is required to operate in these areas,
contact your supplier or Edwards for advice.
1.9 Accessories
A number of accessories are available for the GV pump. These accessories can be used to configure the pump for
specific applications. These accessories are listed in Section 7.
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