| 摘要 |
A ball valve includes a bonnet and a removable insert in which a valve ball and opposed seat rings are contained within a cartridge of separable shells. Cylindrical spring seals of resilient and impervious high density graphite or silicon ruber are mounted on a reduced diameter length of each seat ring. Other embodiments include annular coil springs which compensate for component wear, and contraction and expansion due to changes in temperature. The spring seals are compressed between shoulders on the seat rings and a facing annular recessed surfaces in the cartridge and urge the seat rings into dynamic sealing contact with the valve ball. The spring seals also provide static sealing at the interface of the seat rings and the cartridge. Connecting fittings on mating surfaces of the bonnet and the insert enable the insert to be completely removed from the valve body for easy access for repair or replacement of components within the cartridge.
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