| 摘要 |
An improved seat ring (100), valve body (220) and seat ring valve assembly (10) have self-aligning characteristics that reduce leakage without the need for an unacceptably high level of assembly torque. The seat ring (100) includes at least one annular thrust bearing surface rim (122) for receiving a valve plug (160) to open and close the valve. The seat ring (100) further includes threads (204) positioned on its exterior surface for mating with threads in the valve body (220) to provide a secondary seal of the seat ring (200). In order to prevent unacceptable leakage, a point of contact (206) is provided to seat on an angled body contact surface (236) of the valve to for m a superior primary contact seal. The seal ring valve assembly reduces torque requirements, properly aligns the seat ring within the cavity, and reduces leakage.
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