| 摘要 |
A valve sealing apparatus including a valving member (500), a valve bonnet (520) having a continuous bore (540) that communicates with the valving member (500), a valve shaft (542) housed within the bore (540) of the bonnet (520), a primary sealing member (576) positioned in the bore (540) of the valve bonnet (520) which surrounds the valve shaft (542), and an annular ring (580) positioned between the wall of the valve shaft (542) and the wall of the bonnet (520) for pressing into the face of the primary sealing member (576), for imparting a downward force on the primary sealing member (576), in order to prevent horizontal fluid flow between the valve body and the wall of the valve shaft (542) on both the upper and lower faces of the primary sealing member (576), and a spring (564) associated with the valve bore (540) for maintaining force on the primary sealing member (576) in order to maintain the primary seal.
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