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Mechanical shaft seals for pumps

Move gates to 10 percent open as measured at the scale on the servomotors and check to see if the gate position needle indicates 10 percent. If the gate position needle does not indicate 10 percent, move the eccentric adjustment in the restoring shaft bell crank to position it correctly (photograph 3). Move it toward the restoring shaft if there is over travel and away from the restoring shaft if there is under travel (figure 7). Move the gates to 90 percent, as measured at the servomotor scale, and check the gate position indicator needle. It may. | Mechanical shaft seals for pumps BE THINK INNOVATE GRUNDFOS Mechanical shaft seals for pumps Copyright 2009 GRUNDFOS Management A S. All rights reserved. Copyright law and international treaties protect this material. No part of this material may be reproduced in any form or by any means without prior written permission from GRUNDFOS Management A S. Disclaimer All reasonable care has been taken to ensure the accuracy of the contents of this material however GRUNDFOS Management A S shall not be liable for any loss whether direct indirect incidental or consequential arising out of the use of or reliance upon any of the content of the material. First edition Compositor Print Gills Illustrations Services Scanprint A S Contents Preface.5 Chapter 1. Introduction.7 1. Types of shaft seals.8 2. Mechanical shaft seals.10 3. Operating principle.12 4. Historical development.22 Chapter 2. Mechanical shaft seal types and sealing systems.25 1. Mechanical shaft seal types.26 2. Sealing systems.31 3. Selecting a mechanical shaft seal.42 Chapter 3. Materials.45 1. Seal face materials.46 2. Seal face material pairings.51 3. Testing of shaft seals.55 4. Secondary seals.59 5. Materials of other shaft seal parts.61 Chapter 4. Tribology.63 1. Lubrication.65 2. Wear.zzzzzzzzzzzzzz.zz.zzz.zz.72 Chapter 5. Failure of mechanical shaft seals.75 1. Introduction to failures.76 2. Lubrication failures.77 3. Contamination failures.78 4. Chemical physical degrading and wear.80 5. Installation failures.84 6. System failures.86 7. Shaft seal failure analysis.88 Chapter 6. Standards and approvals.93 1. European Standard EN 12756.94 2. Approvals.97 .