| 摘要 |
A fatigue resistant buttress thread. The thread has a load flank angle of approximately 30 DEG plus or minus approximately 5 DEG and a relief flank angle of approximately 46 DEG plus or minus approximately 5 DEG . The thread engaged depth is approximately 0.232 times the pitch of the thread, and the thread has a root radius approximately 0.175 times the pitch. The thread is particularly well adapted for use in cover retainers for holding valves and rupture discs in plunger pumps. Finite element analysis and actual tests indicate a greatly improved fatigue resistance compared to previously known buttress threads and other thread forms.
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