초록 ▼

The specification and drawings show a ball valve including a housing defining a valve chamber with inlet and outlet passages connected to the chamber. A ball having at least one throughflow aperture is positioned within the chamber and arranged for selective rotation by a cylindrical stem which exte

The specification and drawings show a ball valve including a housing defining a valve chamber with inlet and outlet passages connected to the chamber. A ball having at least one throughflow aperture is positioned within the chamber and arranged for selective rotation by a cylindrical stem which extends from the chamber. Resilient, resinous material substantially fills the chamber and sealingly engages the outer surface of the ball and the inner walls of the chamber. Packing means are disposed about the stem and include a relatively rigid first gland member closely and slidably received in the housing and having an opening through which the stem extends. A first surface of the gland is engaged with the resinous material in the chamber. A recess is formed in the gland member about the inside of the opening. Preferably, the recess has a substantial length axially of the stem. An elongated bushing of resilient, resinous material is positioned in the recess and adjustable means are provided for applying a compressive loading axially of the bushing in a direction toward the first surface to compress the bushing into sealing engagement with the stem and cause the gland member to apply a compressive load on the resinous material within the chamber. Preferably, the bushing is formed from polytetrafluoroethylene or the like.

대표청구항 ▼

In a ball valve including a housing defining a valve chamber, inlet and outlet passages connected to said chamber, a ball positioned in said chamber and having at least one aperture extending therethrough, means including a cylindrical stem engaged with said ball and extending out of said housing fo

In a ball valve including a housing defining a valve chamber, inlet and outlet passages connected to said chamber, a ball positioned in said chamber and having at least one aperture extending therethrough, means including a cylindrical stem engaged with said ball and extending out of said housing for rotating said ball, resilient resinous material substantially filling said chamber and sealingly engaging said ball and the walls of said chamber, the improvement comprising: packing means about said stem including a relatively rigid first gland member closely and slidably received in said housing, said gland member having an opening through which said stem rotatably extends, an elongated recess formed axially inwardly in said gland member about the inside of said opening, said recess terminating in a bottom wall defined by said gland member and being substantially filled with a bushing of resilient resinous material; and, adjustable means engaging the outer axial end of said bushing and mounted for free movement axially of said shaft, and said first gland member for applying compressive loading to said bushing to compress said bushing into sealing engagement with said stem and to indirectly cause said gland member to apply a compressive load on the resinous material in said chamber so that substantially all of the compressive loading applied to said resilient material in said chamber is transmitted through said packing.