High airtightness butterfly valve

Abstract

The invention discloses a high airtightness butterfly valve. The high airtightness butterfly valve comprises a valve body and a medium channel arranged in the valve body, the valve body is internallyprovided with a valve rod which runs through the medium channel, a valve seat is fixedly arranged on a wall of the medium channel, a butterfly plate is fixedly arranged on the valve rod, the butterflyplate is fixedly provided with a pressing ring, a mounting ring groove, which surrounds the center of a circle of the butterfly plate, is formed between the butterfly plate and the pressing ring, themounting ring groove is internally provided with a seal ring which cooperates with the valve seat to realize sealing, a deformation gap, which is used for the seal ring to deform, is arranged betweena side, which faces the valve seat, of the mounting ring groove and the seal ring, and an extending part, which penetrates between the pressing ring and the butterfly plate and is pressed by the pressing ring and the butterfly plate, extends at a position where the seal ring faces a side of the deformation gap and is close to the butterfly plate. The high airtightness butterfly valve has the following advantages and effects: the valve has longer service life and can reach a better seal effect.

Description

technical field [0001] The invention relates to a valve, in particular to a butterfly valve with high sealing performance. Background technique [0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used for switching control of low-pressure pipeline medium. of a valve. [0003] The Chinese patent with the notification number CN207178716U discloses a triple-eccentric two-way hard-sealed butterfly valve, which includes a valve body and a valve shaft. Cooperating adjustment device, the adjustment device includes a supporting block and an adjusting bolt that offset each other, the upper end surface of the supporting block is offset against the lower end surface of the valve shaft, and an annular sealing groove I with a sealing ring I is arranged on the supporting block. The bolt includes a one-piece top portion, a threaded portion and a rotating portion. [0004] In the above patent, a floating valve seat is set in the v...

AI Technical Summary

Problems solved by technology

Since the fluid medium will scour the sealing surface of the floating valve seat during the rapid flow process, the surface of the floating valve seat in contact with the sealing ring will become rough; in addition, the butterfly plate will drive the sealing ring toward The floating valve seat moves in the direction and forms relative extrusion friction with the sealing surface of the floating valve seat, causing the rough sealing surface to cause local wear on the sealing ring, which will easily affect the service life of the sealing ring in the long run, thus affecting the sealing effect of the butterfly valve

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