Actuator rod hermetic sealing apparatus employing concentric bel

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member


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277 73, 277212FB, 2513352, F16J 1516, F16J 1540




An apparatus that provides a hermetic seal of a valve actuator rod in a valve housing includes a piston having a center bore mounted on the actuator rod and a pair of concentric bellows, both connected to the piston at one end and connected to the actuator rod and the interior of the valve housing at their opposite ends. A sealing liquid contained in the valve housing at one side of the pair of bellows provides pressure compensation for a process pressure on the opposite sides of the bellows. The piston bore provides a tight sliding fit of the piston on the actuator rod and the piston is provided with at least one flow bypass channel permitting unrestricted flow of the sealing fluid through the piston channel. A sensitive monitoring system is mounted on the valve housing and detects slight leaks of sealing liquid through the concentric bellows or the actuator rod packing by detecting changes in the position of the piston relative to the valve housing interior.

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