Edwards Diffstak 63/150 - Page 55

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Edwards and the Edwards logo are trademarks of Edwards Limited.

Maintenance

B344-21-880 Issue N

Figure 27 - Adjust or replace the position indicators

1. Position indicator (valve closed)

2. Gap

3. Dovetail groove

4. Position indicator wires

5. Gap

6. Position indicator (valve open)

7. Clamp screw

Main Page

Table of Contents5
Introduction9
Scope and Definitions9
Description10
Construction11
Principle of Operation11
Sectional View of Valved Diffstak 63/150 Pump12
Sectional View of Valved Diffstak 100/300 Pump13
Sectional View of Valved Diffstak 160/700 Pump14
Part Sectional View of Valved Diffstak 250/2000 Pump15
Technical Data17
General17
M-Model and P-Model Pumps17
C-Model and F-Model Pumps18
Pump Fluid Data18
Construction Materials19
Item Numbers19
Dimensions of M-Model Diffstak Pumps (MM)20
Dimensions of P-Model Diffstak Pumps (MM)21
Dimensions of C-Model Diffstak Pumps (MM)22
Installation23
Safety23
Unpack and Inspect23
Locate the Pump24
Vacuum Connections24
Diffstak Inlet24
Inlet-Flange Fitting Details25
Diffstak 250/2000 Installation Details28
Backing and Roughing Connections29
Cooling-Water Connections30
Electrical Connections30
Connect the Electrical Supply to the Pump30
Heater Electrical Connections31
Connect the Cooling-Fail Thermal Snap-Switch (Optional)32
Connect the Pump-Ready Thermal Snap-Switch (Optional)32
Cooling-Fail Thermal Snap-Switch Electrical Connections32
Connect the High-Vacuum Isolation-Valve Position Indicators (63/150P and 100/300P Only)33
Connect the High-Vacuum Isolation-Valve Position Indicators (160/700P and 250/2000P Pumps Only)33
Position Indicator Connections (160/700P and 250/2000P Only)33
Connect the Compressed-Air Supplies (P-Model Pumps Only)34
Leak-Test the System34
Fill the Pump with Fluid35
Safety of Vapour Pump Fluids35
Recommended Pump Fluids36
Schematic Diagram of Typical Pneumatic Circuit (P-Model Pumps Only)36
Filling Procedure37
Operation39
Introduction39
Pump Start-Up39
Typical Pumping System: Diffstak 63/150, 100/300 and 160/700 Pumps40
Typical Pumping System: Diffstak 250/2000 Pumps41
Re-Admission of Air to Your Vacuum System42
Re-Evacuation of Your Vacuum System42
Pump Shut-Down42
Maintenance43
Safety43
Maintenance Plan44
Check the Pump Fluid-Level44
Inspect the Pump Fluid (and Drain if Necessary)45
Inspect and Clean the Pump45
Preparation45
Remove the High-Vacuum Isolation-Valve (M-Model Pumps)45
Remove the High-Vacuum Isolation-Valve (P-Model Pumps)46
Dismantle the Pump46
High-Vacuum Isolation-Valve: Diffstak 63/150, 100/300 and 160/700 Pumps47
High-Vacuum Isolation-Valve: Diffstak 250/2000 Pumps47
Inspect and Clean the Interior48
Reassemble the Pump48
Pneumatic Actuator for the Isolation-Valve: Diffstak 63/150P and 100/300P Pumps49
Pneumatic Actuator for the Isolation-Valve: Diffstak 160/700P Pumps49
Pneumatic Actuator for the Isolation-Valve: Diffstak 250/2000P Pumps49
Clean the Radiation Shield50
Lubricate/Inspect the High-Vacuum Isolation-Valve (M- and P-Model Pumps)51
Replace the Pump Heater(S)52
Diffstak 63/150 and 100/300 Pumps52
Heater Assembly: Diffstak 63/150 and 100/300 Pumps52
Diffstak 160/700 and 250/2000 Pumps53
Heater Assembly: Diffstak 160/700 and 250/2000 Pumps53
Check the Heater Securing Nuts54
Clean the Cooling-Coil54
Adjust or Replace the Position Indicators54
Adjust the Position Indicators54
Replace the Position Indicators54
Fault Finding56
Storage and Disposal57
Storage57
Disposal57
Service, Spares and Accessories59
Introduction59
Service59
Spares59
Pump Fluids59
Spares Common to All Diffstak Pumps60
Spares for Diffstak M- and P-Model Pumps60
Accessories61

Edwards Diffstak 63/150 - Page 55

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