B344-21-880 Issue N
Page 20 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
Figure 13 - Diffstak 250/2000 installation details
Figure
key
Component Size/type
Quantity
required
1 ISO tube and collar assembly ISO250 1
2 ★ Rotatable flange pack ISO250 1
3 P Bolts (M- and P-model) M10 x 110 12
4 ◆ Inlet seal: trapped 'O' ring ISO250 1
5 PV40 valve, manual PV40MK 2
PV40 valve, pneumatic PV40MK 2
6Clamp NW40 5
7 ‘O’ ring assembly NW40 5
8 T-piece NW40 1
9 Elbow NW40 1
10 ● 3-port electropneumatic control-valve - 2
11 ▲ Standard 5-port electropneumatic control-valve - 1
★ Not required for C-model pumps; use claw clamps to bolt the pump ISO inlet-flange directly to the ISO tube
and collar assembly; use 6 claw clamps for the ISO250 flange.
P Bolts are not available from Edwards. Bolts are not required for C-model pumps; use claw clamps to bolt the
pump ISO inlet-flange directly to the ISO tube and collar assembly.
● Only required for pneumatically operated PVPK valves; use 1 3-port control-valve for each of the 2 PVPK
valves.
▲ Only required for P-model pumps, to control the high-vacuum isolation-valve.
◆ Supplied with the pump (1 off of each component).
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