A plug valve whose chamber or bore and whose runs or port passages are fully lined with corrosion-resistant material, most preferably polytetrafluoroethylene, such valve having recesses in its runs, n

This invention relates to a floating conical plug valve comprising the valve body with a path for medium passing by, the conical valve chamber which is intersected into the said path perpendicularly,

An improved cam sleeve operator for use primarily with valves of the plug type in which a tapered plug is raised to unseat associated slips and then rotated to a valve open position during opening of

A rotary lift-turn type plug valve mechanism includes a valve body and bonnet structure defining a tapered valve chamber that receives a tapered plug member which is operated by linear and rotary comp

A lubricated split plug valve includes a valve body defining a chamber with fluid ports therethrough. A valve stem is rotatably mounted in the body and engages a split cylindrical valve member.

A non-locking tapered plug valve is provided which prevents taper locking of the plug member by ensuring against pressure responsive plug movement toward the small extremity thereof due to positive or

A rotary plug valve comprising a valve body having a cylindrical bore with axially offset lateral inlet and outlet ports communicating with the bore on opposite sides thereof. A cylindrical plug in th

An improved rotary plug valve of the type having a valve body with a fluid inlet conduit and a fluid outlet conduit therein has a rotary plug disposed for rotation in the valve body between an open po