| 摘要 |
A fluid flow control device includes a valve body (104), a valve seat (132) disposed within the valve body, and a valve cage (136) coupled to the valve seat within the valve body. The fluid flow control device also includes a gland (168) defined by the valve body, the valve seat, and the valve cage. The valve body has a first thermal expansion coefficient and the valve seat and/or the valve cage have a second thermal expansion coefficient different from the first thermal expansion coefficient. The fluid flow control device further includes a sealing assembly (172) disposed within the fluid flow control device to provide a seal between the valve body and the valve cage. The sealing assembly exploits differential thermal expansion between the valve body and the valve cage in a direction parallel to the longitudinal axis and in a direction transverse to the longitudinal axis to improve the seal. |
