FIELD: machine building.
SUBSTANCE: fluid flow control device includes valve body (104), valve seat (132) disposed within the valve body, and valve cage (136) coupled to the valve seat within the valve body. Fluid flow control device also includes gland (168) defined by the valve body, the valve seat, and the valve cage. 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. Fluid flow control device further includes sealing assembly (172) disposed within the fluid flow control device to provide a seal between the valve body and the valve cage.
EFFECT: 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.
30 cl, 12 dwg
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RU2610353C2 |
