| 摘要 |
<p>A method and apparatus are provided for injecting sealant into a packing assembly chamber surrounding a valve stem (11) of a valve (2) without venting the pressure within the valve (2). A cylindrical body (60) is frictionally welded to the exterior of the valve (2) adjacent the packing assembly chamber. A drill bit is passed into the body (60) and through a set of packing seals (87). An opening is completed into the packing chamber. As the drill bit is withdrawn from the body (60), a second valve (70) is manually 'closed' to isolate the packing chamber from the drill bit and prevent the escape of pressurized fluid when the drill bit is removed from the seals (87). Thereafter, a device for injecting sealant is attached to the body (60) and the valve (70) is 'opened' to allow the sealant to flow into the packing chamber.</p> |
