Features:

Results from an extensive test program have shown that our double stack of live-loaded RPTFE Chevron style packings clearly outperform all other types of packing configurations evaluated. In applications where this material is acceptable, it would be the hands-down choice. However, when resistance to high temperatures is a must, such as in a valve requiring fire-safe performance, then the Graphite packings must be utilized.  Testing with ESVP 9000 style live loaded packing has shown it is reasonable to expect that over the anticipated life of the packing (100,000 cycles) two packing adjustments will be required. From our test, the first adjustment could be anticipated around the 20,000 cycle point and the second some time after the 60,000 cycle mark. The graphite packing used for this test in our Apollo® Top Entry Ball Valves is provided by Garlock® under the trade name EVSP 9000. 

The results of your tests are presented here in 5000 cycle increments.  Measurements were taken more frequently than this and those other data points showed no evidence of any trends in the growth of a leak from a minor status to one requiring adjustment. Through process monitoring, statistical data can be used to establish preventive maintenance schedules showing packing adjustment intervals.

*Indicates a packing adjustment was made.

Garlock® is a registered trademark of Coltec Industries.