© Edwards Limited 2007. All rights reserved. Page iii
Edwards and the Edwards logo are trademarks of Edwards Limited.
Contents
B344-21-880 Issue N
Illustrations
Figure Page
1 Sectional view of valved Diffstak 63/150 pump ..................................................................... 4
2 Sectional view of valved Diffstak 100/300 pump ................................................................... 5
3 Sectional view of valved Diffstak 160/700 pump ................................................................... 6
4 Part sectional view of valved Diffstak 250/2000 pump ............................................................ 7
5 Dimensions of M-model Diffstak pumps (mm) ......................................................................12
6 Dimensions of P-model Diffstak pumps (mm) ......................................................................13
7 Dimensions of C-model Diffstak pumps (mm) ...................................................................... 14
8 Inlet-flange fitting details .............................................................................................17
9 M- and P-model Diffstak inlet connection ..........................................................................18
10 F-model Diffstak inlet connection ....................................................................................18
11 C-model Diffstak inlet connection ...................................................................................18
12 Diffstak 63/150, 100/300 and 160/700 installation detailsn .....................................................19
13 Diffstak 250/2000 installation details ...............................................................................20
14 Heater electrical connections ........................................................................................23
15 Cooling-fail thermal snap-switch electrical connections .........................................................24
16 Position indicator connections (160/700P and 250/2000P only) ................................................ 25
17 Schematic diagram of typical pneumatic circuit (P-model pumps only) ....................................... 28
18 Typical pumping system: Diffstak 63/150, 100/300 and 160/700 pumps ......................................32
19 Typical pumping system: Diffstak 250/2000 pumps ...............................................................33
20 High-vacuum isolation-valve: Diffstak 63/150, 100/300 and 160/700 pumps .................................39
21 High-vacuum isolation-valve: Diffstak 250/2000 pumps ..........................................................39
22 Pneumatic actuator for the isolation-valve: Diffstak 63/150P and 100/300P pumps ........................41
23 Pneumatic actuator for the isolation-valve: Diffstak 160/700P pumps ........................................41
24 Pneumatic actuator for the isolation-valve: Diffstak 250/2000P pumps .......................................41
25 Heater assembly: Diffstak 63/150 and 100/300 pumps ...........................................................44
26 Heater assembly: Diffstak 160/700 and 250/2000 pumps ........................................................45
27 Adjust or replace the position indicators ........................................................................... 47
Tables
Table Page
1 Inlet-flange details (M-, P- and F-model pumps only) ............................................................17
2 Pump fluid thermal breakdown .......................................................................................27
3 Maintenance plan .......................................................................................................36
4 Fault finding .............................................................................................................48
Trademark credits
Fomblin
®
is a registered trademark of Ausimont SpA.
Viton™ is trademark of DuPont Dow Elastomers L.L.C.
Diffstak
®
is a registered trademark of Edwards.
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