Electric opening and closing device for external screw stop valve

Abstract

This article is a submerged type electric switch for an external screw partition valve that enables use when submerged. As shown in the "Reference Perspective View Showing an Example of the Usage Method and the Names of Each Part" and the "Reference View of the Upper Part of this Article Showing the Expansion and Contraction of the Cylinder Rod", an air cylinder is arranged in parallel to the sealed (waterproof) valve rod cover, and since the valve rod cover and the air cylinder are connected by an air pipe, even when the valve rod moves up and down during the opening and closing of the external screw partition valve, the volume change inside the valve rod cover is absorbed by the air cylinder. As a result, damage to the valve rod cover is prevented.

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