| 摘要 |
A valve (100) has a valve stem (150) sealed by packing (160). A gland spigot (180) applies an axial compression loading to the packing (160) via a sleeve (130) when bolts (240, 250) are tightened. The spigot (18) has arms (190, 200) with slots (400, 401) that divide the arms (190, 200) into upper and lower branches (402, 403). The branches (402, 403) arc urged towards each other on tightening the bolts (240, 250) to pre-load the packing and act as integral springs to maintain the compression loading in use of the valve (100). The deflection of the branches (402, 403) is limited by one or more washers (251, 252) located on the bolts (240, 250) between the branches (402, 403) to control the loading applied to the packing (160).
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