Built-in concave-convex wheel limiting structure for three / four eccentric butterfly valve

Abstract

The utility model belongs to the technical field of valves, and relates to a built-in concave-convex wheel limiting structure for a three / four eccentric butterfly valve, which comprises a valve body, a valve shaft is rotatably arranged in a shaft hole of the valve body, a valve plate is mounted on the valve shaft, and the valve shaft can drive the valve plate to rotate to realize opening and closing control of the valve. The check valve is characterized in that concave wheels which are integrally cast and formed are respectively arranged on the upper part and the lower part of the valve body runner close to the shaft hole, and each concave wheel is provided with a first side arc surface; an upper shaft shell and a lower shaft shell of the valve plate are respectively provided with a cam which is integrally cast and formed, the cam is provided with a second side arc surface, the first side arc surface is a limiting surface for preventing the valve from being closed excessively, and the second side arc surface and the first side arc surface can achieve linear contact limiting. The concave-convex wheel limiting structure is accurate in limiting, good in sealing performance and high in reliability.

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