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Discussion of results

Throughout the 40,000 cycles of the test, there was no binding or failure to shift of any of the test samples. The Nicotef resilient and standard resilient seat test samples, (samples with a 3 or 4 designation), did not exhibit any leakage throughout the testing. The Nicotef metal seated and standard metal seated valves, (samples with a 1 or 2 designation), did exhibit an increase in leakage.

Observations

In general all of the seats exhibited elliptical wear as a result of the side loading of the lever when the valve is cycled. This side loading causes an out of round condition on the seating surface resulting in seat leakage. As recorded in the test results this leakage is more pronounced in the metal seated valves since the resilient seat is able to absorb the side loading without permanent deformation.

Table 3. Valve Seat Leakage Resilient Seated Valves All leakages are in cc/min unless noted.

5,000 thru 40,000

Ener. De-Ener.

Cycles

Test Sample

Initial

Ener.

De-Ener.

Conclusions

Resilient Seated Valves

Both the standard and the Nicotef resilient seats performed well during all of the testing. There was no leakage throughout the testing. Visual observations of both constructions during post-test disassembly and inspection revealed no noticeable differences in the amount of wear between the standard construction and the Nicotef construction.

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