Upper-detachable breakdown structure of three-eccentric-butterfly-valve

Abstract

The invention discloses an upper-detachable breakdown structure of a three-eccentric butterfly valve, which comprises a four-way pipe type valve body, a valve cover, a valve rod, a butterfly plate and a seal ring, wherein the valve rod and the butterfly plate arranged in the middle of a rod body of the valve rod form a valve cavity cutout face through a column pin. The valve body for placing the lower end part of the valve rod is a lower part branch valve body having certain eccentricity with an upper part branch valve body , a valve rod end part arranged in the inner cavity of the lower part branch valve body is provided with a shaft sleeve which is in coaxial core with the valve rod, and accordingly, a structure for positioning the lower part of the valve rod which can enable the whole valve rod to drive the butterfly plate to horizontally move to one side of the valve cavity together during disassembly. The upper-detachable breakdown structure of the three-eccentric butterfly valve ensures that the butterfly plate on the valve rod can leave a flow channel sealing face of the inner cavity of the valve body along with the translation of the valve rod after the valve cover and the eccentric shaft sleeve arranged on a lower part valve rod are taken down, thus the whole valve rod is convenient to take out from the cavity in the middle part f the valve body, thereby realizing replacement of a butterfly plate sealing element without disassembling the whole valve body from a fluid pipeline, and obviously reducing cost on pipeline maintenance greatly.

Description

technical field [0001] The invention relates to a triple-eccentric butterfly valve, in particular to a triple-eccentric butterfly valve capable of realizing on-line maintenance with a detachable disassembly structure, which belongs to a fluid pipeline cutting device. Background technique [0002] Because the butterfly valve not only has the characteristics of simple structure, small size, light weight, small fluid resistance, convenient and quick operation, and relatively labor-saving, but also can achieve good sealing and adjusting performance under low pressure, it is widely used in various fluid delivery pipelines. . [0003] In the traditional butterfly valve, the torque is transmitted between the valve shaft and the valve plate by a cylindrical pin or a tapered pin, so when transporting some suspension fluid, long-term operation will cause damage to the sealing ring. Because the traditional three-eccentric butterfly valve adopts the inherent connection structure of the...

AI Technical Summary

Problems solved by technology

This inherent structure not only brings the defects of difficult maintenance and relatively long maintenance time, but also limits the further promotion and use of butterfly valves in infusion pipelines

Images