Jamesbury 3-Piece Ball Valves, Series 4000, Threaded End, Socket Weld, Butt Weld, Rev 2.0, Safety Manual
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5.3
Maintenance
Any repair of Series 4000 3-piece ball valves must be carried out by Metso or competent personnel. Mainte-
nance procedures are given in the IMO.
After the maintenance is completed, do a shell test and verify seat tightness, if necessary for the application,
according to relevant tightness standards. Verify the functionality of the valve including the assembly regard-
ing the safety function in question. Note that all maintenance actions should be recorded.
Metso Service provides the recommended spare part kits defined in the Bills of Material contained in every
Instructions, Maintenance and Operation (IMO) manual. The need for parts replacement increases with the
number of valve operations done during it’s lifetime and with the severity of service. Only authorized Metso
replacement parts should be used.
Soft sealing materials especially are affected by aging, and useful lifetime depends strongly on the application.
Therefore, the condition of those components should be checked carefully during proof testing. In optimum
operating conditions, the maintenance interval may be extended up to 10 years. The estimated typical time for
spare parts change is 0 to 2 times during the valve useful lifetime. Possible problems must be resolved in any
case of failure, or doubt observed in proof testing.
6.
References
[1] IMO –203, 210
[2] Technical bulletin B105-1
[3] SIL certificate TUV V 369.04/16
[4] IEC 61508 – Part 1 to 7 (2010)
[5] Neles ValvGuard IMO 7VG9H70ES, 7VG9F70, and 71CP9H
Appendix 1.
Examples of reliability (PFD) calculations for complete final elements.
Series 4000 3-piece ball valve with VPVL Series actuator, equipped with Neles ValvGuard for partial stroke and
safety action. The diagnostic factor 77 % is used for the complete valve assembly.
