BELLOWS SEALED ROTARY VALVE

摘要

A valve member, e.g. a ball valve, is positioned in a chamber for rotation between open and closed positions to open and close the chamber. An acutator is rotatable about an axis coaxially aligned with the valve member axis. A lower end of a valve stem is connected to the valve and an upper end is connected to the actuator. The valve stem upper end is displaced angularly from the valve stem lower end. The valve stem lower end has an axis aligned with the rotational axes of the valve member and the actuator. The axis of the valve stem upper end is positioned in spaced parallel relation to the axes of the actuator and the valve member. The upper end of the valve stem is offset from the axis of rotation of the actuator, so that the valve stem upper end orbits about the actuator axis as the actuator is rotated to move the valve member between the open and closed positions. The valve stem is sealed by a bent bellows.