Flowserve GZV 10 - Handbuch (Seite 3)

GESTRA GmbH
Datum/Date: 2001 -09-18
Seite/Page:
3 Unterlagen-Nr./Dokument No.:808535
Für diese Unterlage behalten wir uns alle Rechte vor / All rights reserved - System: Word 97 für Windows
3.0 Maintenance
3.1 We recommend to check the valve at regular intervals.
3.2 The valve is equipped with a PTFE seal located at the valve cone. If the shut-off of the valve is
untight, the cone seal is defective and has to be replaced or reconditioned. To change the
cone seal proceed as follows:
- Depressurize valve
- Undo body screws
- Detach yoke
- Remove force-fitted seal from cone
- Carefully and slowly insert new cone seal into the dovetail groove by using a pressing-on
plate as shown in the following drawing
- Make sure that the seal fits tightly in the cone without allowing any play when moving the
cone by hand
- Re-attach yoke with new seal inserted and tighten body screws
- Close valve for 24 hours as tightly as possible in order to adapt the seal to the outline of the
body and the cone
- Check valve for external leakproofness and, after repeated operations, for tight shut-off
3.3 The maintenace-free spindle sealing it provided by a spring-loaded seal and an O-ring. To
change the spindle sealing proceed as follows:
- Depressurize valve
- Undo body screws
- Detach yoke
- Remove handwheel
- Pull spindle out by turning it downwards
- Remove star ring (item 37), star ring support (item 7) and seals
- Clean spindle and yoke seating surfaces
- Insert new seals
- Re-attach yoke with new seal inserted and tighten body screws
- Check valve for external leakproofness and, after repeated operations, for tight shut-off