Cameron TBV 2100 Series Handbuch für Betrieb und Wartung - Seite 4
Blättern Sie online oder laden Sie pdf Handbuch für Betrieb und Wartung für Kontrolleinheit Cameron TBV 2100 Series herunter. Cameron TBV 2100 Series 5 Seiten. Cryogenic three piece ball valve
Seite drucken6. Rotate valve ball to closed position and remove seats and ball.
7. If it is necessary to replace the stem seal, remove the handle nut, lockwasher, handle, packing
nut, stop and follower in that order. Lower stem into body cavity, unscrew set screw and collar
and remove thrust bearing. Lift stem through stem extension and replace stem seal assembly.
8. Clean and inspect all components to be sure that they are free from foreign matter and pit
marks, paying particular attention to the areas that must maintain a seal (e.g., finished
diameter on stem, inside pipe end surface, ball, and bonnet hole). These areas should be free
from scratches and pitting.
9. Once all components have been cleaned, inspected, and replaced as necessary, the valve can be
rebuilt using the factory repair kit recommended.
10. Reassemble new stem seal package (refer to illustration).
11. Replace follower, stop and stem seal adjusting nut loosely.
12. Assemble ball into body cavity while stem is in the closed position. Once ball is engaged with
stem, rotate to open position. This will prevent the ball from falling out during assembly.
13. Insert new seats into body and body seals on pipe ends.
14. Assemble center section back into line again making sure there is sufficient clearance to avoid
end plate sealing surface damage.
NOTE: Reassembly of the center section can only be replaced one way. This has been designed
to ensure valve relief to the upstream side will be maintained as originally installed.
15. Assemble body bolts and nuts to valve. Tighten as indicated in Steps 5 & 6 of the installation
procedure.
16. Adjust stem packing as follows:
a. Tighten packing nut firmly. The following approximate torque values are given as a guide.
It is recommended that the packing be compressed, relaxed, and then re-compressed to
these same values. This has been found to provide optimum life for the stem packing.
NOTE: Periodic stem packing adjustment may be required depending on pressure and temperature
and number of cycles. Refer to the recommended stem nut torque chart located below
VALVE SIZE
STEM NUT TORQUE
1/2" – 3/4"
80-100 inch-pounds
1"
140-180 inch-pounds
1 1/2" – 2"
250-300 inch-pounds
3" – 4"
75-95 foot-pounds
6" – 8"
90-110 foot-pounds
Page 4 of 5
OM-TBV-2100 Rev.05 – 05/07