A plug valve includes a valve body, an actuator, and an adapter. The valve body has an actuator end,Safety Valves a valve body end, and a stem chamber extending through said adapter. The valve body end of the adapter provides a valve body cover that can be attached to the valve body. The actuator end of the adapter is attached to the actuator by a threaded member extending through a set of holes of the adapter and the actuator. The adapter can have a bleedway in communication with the stem chamber for showing leakage.Plug Valves The holes of the adapter can be conforming to ISO standards for actuators. The invention relates to a valve with high flow resolution within a flow range, which valve comprises a valve housing and a valve plug,BALL VALVES whereby the valve plug comprises a cavity and a flow regulating slit which in cooperation with the valve housing forms a flow passage. On the shell surface of the valve plug, when the valve is in a fully open position, there is an area which, relative to the outlet of the valve housing, is situated on the other side of the axis of rotation of the valve plug, which area is free from the cavity. The intersection of the cavity with the shell surface of the valve plug is preferably situated on the one side of the axis of rotation of the valve plug so that the valve plug exhibits a continuous shell surface free from the cavity along at least 180 degrees of the circumference of the valve plug, whereby the flow regulating slit may extend over a substantial portion of the circumference of the valve plug, thereby providing good flow resolution in the flow range in which the flow enters the cavity via the flow regulating slit only.

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