| 摘要 |
High temperature seals (102) for use in rotary valves (100) are described herein. An example seal for use with a rotary valve includes a primary seal (134) to engage a flow control member (104) when the primary seal is in a first condition and a secondary seal (136) at least partially disposed within the primary seal (134). The primary seal (134) is to prevent the secondary seal (136) from engaging the flow control member (104) when the primary seal (134) is in the first condition and the secondary seal (136) is to engage the flow control member (104) when the primary seal (134) is in a second condition. |
