The outlet valve of the present invention includes a valve body member having a first and second opening associated therewith.

A rotary plug valve having a plug member rotatable in a valve housing between an opened position and a closed position, the housing member having a valve seat therein with a first passage opening to t

An improved plug valve is of the type that includes a valve body having a bore extending therethrough and a pair of passages intersecting the bore and being substantially normal to the axis of the bor

A rotary plug valve having a plug member rotatable in a valve housing member between an open position and a closed position, the plug member carrying a sealing ring, such as an O-ring seal or the like

Plug valves are valves with cylindrical or conically-tapered "plugs" which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more hollow pass

An improved plug-type valve of the type having a plug connected to slips wherein opening and closing the valve involves both vertical and rotational motion of the plug, the novel features of the inven

Plug valves have been particularly desirable valves for shut-off use for many years. However, as the size of the plug valve increases, oftentimes the amount of torque required to operate the valve als

Plunger valve works: When the hand wheel rotation, driven by the valve stem hole rack in the middle of the plunger up and down reciprocating movement to complete the valve opening and closing function