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 components of movement to achieve valve operation.PLUG VALVES Externally adjustable plug positioning means is provided by the valve mechanism to enable the position of the plug element to be adjusted relative to the inlet and outlet flow passages defined by the valve body. Plug dampening means is also provided for applying a dampening force to the plug element to prevent slamming of the plug upon reaching the end of a rotational component of movement.Butterfly Valves A valve actuator is also provided that operatively engages the valve stem of the plug and is capable of imparting both linear and rotary components of movement to the valve stem for unseating, rotating and reseating the valve element within the valve chamber.Cast Gate, Globe, Check Valves A system is provided for maintenance of predetermined pressure differential across the sealing elements of the valve and to compensate for volumetric changes as the valve element is seated and unseated.

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