| 摘要 |
A mechanical end face seal of the non-contacting type includes a primary seal ri ng having a back section, a seal face section and a middle section between the seal face and the back sections, each primary ring section having a radical dimension, defined as the difference between the outermost radius and the innermost radius of said respective section , the radical dimension of the back section being in a ratio relative to said middle section o f between about 1.5 to about 3.1, and more preferably of between about 1.9 to about 2.5, a nd most preferably about 2.0 to about 2.3. Additionally, the mating seal ring includes grooves extending from one seal ring circumference toward the other and terminating adja cent a dam at a radius Rg, it is beneficial to have the boundary between the grooves and th e dam have a radius Rg slightly larger or smaller, within about 10%, than the outer radius of the middle section.
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