Patent ID: 6079695
Filing Date: 2000-06-27
Classification: F16K

Abstract:
A butterfly valve having a valve body with a valve seat therein and a valve disc assembly carried on a valve stem such that valve disc assembly can be moved into and away from sealing engagement with said valve seat, comprising:a valve body having a through bore to be connected on opposite sides to flow conduits, and a side bore for receiving a valve stem into said through bore, said valve seat mounted within said through bore, and a valve disc assembly carried on said valve stem to be rotationally sealingly engaged to said valve seat upon rotation of said valve stem;packing material arranged around said valve stem within said side bore;a packing gland assembly arranged above said packing material for retaining said packing material within said side bore, said packing gland assembly comprising a packing gland, a gland retainer having an inside diameter smaller than an overall diameter of said stem, a packing flange arranged above and partially around said gland retainer having an inside diameter greater than an overall diameter of said packing gland, and a fastener assembly for drawing said packing flange downwardly towards said valve disc to compress said packing material; andsaid stem having a reduced diameter, and said gland retainer arranged to encircle said reduced diameter.