Rotary shaft seals

摘要

Rotary shaft seals are disclosed herein. An example apparatus includes a valve body and a shaft extending into the valve body. The shaft is to rotate relative to the valve body. The example apparatus also includes a seal. The seal is disposed outside of the valve body and fixedly coupled to the valve body and the shaft to provide a fluid seal between the shaft and a cavity within the valve body.

主权项

1. An apparatus, comprising:
a valve body; a shaft extending into the valve body, the shaft to rotate relative to the valve body; and a seal disposed outside of the valve body to provide a fluid seal between the shaft and a cavity within the valve body, the seal having a first portion fixedly coupled to the valve body and a second portion fixedly coupled the shaft to enable the first portion of the seal to rotate relative to the second portion of the seal when the shaft is rotated about a longitudinal axis of the shaft, the seal having:
a first rotary portion having a first edge and a second edge defining a first longitudinal length of the first rotary portion, the first rotary portion having a plurality of longitudinal folds, the longitudinal folds each defining a body that extends between the first edge and the second edge such that a first end of the body is defined by the first edge and a second end of the body is defined by the second edge;a linear portion adjacent the rotary portion, the linear portion having a lateral fold extending around a circumference the seal such that the lateral fold is substantially perpendicular to the longitudinal axis of the shaft; anda second rotary portion that includes longitudinal folds that extend between a third edge of the second rotary portion and a fourth edge of the second rotary portion, the third and fourth edges defining a second longitudinal length of the second rotary portion, the linear portion being disposed between the first and second rotary portions.