High aspect ratio threadform

Details High aspect ratio threadform High aspect ratio threadform

2007-08-06

2010-10-26

Bastianelli, John (Department: 3753)

Valves and valve actuation

Mechanical movement actuator

Screw

C251S326000, C074S089230, C074S424750, C411S366100, C411S411000

Reexamination Certificate

active

07819385

ABSTRACT:
A threadform for a gate valve has a set of threads on a stem that engage a threaded receptacle of the gate. When the stem is rotated, the gate moves. The threads have a thread height to thread base thickness ratio that is at least the inverse of 0.7 times e raised to 0.388 divided by a nominal thread diameter of the threads. That ratio is at least 1.1.

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