| 摘要 |
A three-ring packing set for a forged valve stem is disclosed which includes upper and lower adapter rings formed from fiber reinforced graphite tape and each having a first density and a first axial thickness, and an intermediate preform ring formed from graphite tape and having a second density that is less than the density of the upper and lower adapter rings and a second axial thickness that is less than the axial thickness of each of the adapter rings.
|
