A bellows sealed plug valve includes a valve body having an inlet passage and an outlet passage, a valve chamber between the inlet and outlet passages. A valve plug has substantially the same shape as

In a rising-plug plug valve wherein the plug and valve body at the narrow end of the plug define a cavity, a passage is provided between the cavity and the outlet opening of the plug valve.

The preferred embodiment comprising a truncated cone valve plug, or a truncated cone with curved sides as in the tractrix valve is described. A step is fabricated into the large end of the valve plug.

A valve comprising a casing having a passageway therethrough for flow of fluid and a tapered bore intersecting the passageway, a tapered plug rotatably mounted in the tapered bore adapted to block the

A plug valve with a body having an inlet and an outlet with a tapered rotatable plug between the inlet and the outlet. The plug and valve body lined with a thermoplastic coating.

A tapered rotary valve plug fits into a tapered valve chamber and is rotated by an operating head or cap. Cam means are provided to automatically shift the operating head and valve plug axially as the

A plug valve comprising a body with a cylindrical or conical cavity to receive a sealing liner and a complementary plug. A pair of vertically disposed, parallel ribs extend inward from the surface of

A plug valve has a body with inlet and outlet ports with a cylindrical chamber therebetween for receiving a cylindrical plug.