A butterfly valve with locking function

Abstract

This utility model discloses a butterfly valve with a locking function, including a valve body, an extension tube, a valve stem, and a butterfly plate; it also includes a locking mechanism, which comprises an operating ring, a push rod, and a spring. The operating ring is sleeved on the outer circumference of the extension tube, and a guide hole is provided through the side of the extension tube. The push rod is slidably disposed in the guide hole. The spring applies a spring force to the push rod in a direction away from the valve stem. The inner circular surface of the operating ring is provided with a first annular groove, a second annular groove, and a conical groove. The inner diameter of the first annular groove is smaller than the inner diameter of the second annular groove. When the operating ring moves axially, the push rod has a locked position where its outer end abuts against the inner circular surface of the first annular groove and its inner end abuts against the outer circular surface of the valve stem, and an unlocked position where its outer end abuts against the inner circular surface of the second annular groove and its inner end disengages from the outer circular surface of the valve stem. This utility model can lock the valve when it is closed, preventing accidental opening of the butterfly valve due to employee misoperation or accidental contact, which could lead to safety accidents such as media leakage or explosion.

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