Detachable ring seal butterfly valve

Abstract

The invention involves a detachable ring sealing butterfly valve. The valve stems are sealed on the valve body through the upper and lower sets, respectively, and the valve stems are connected with the output shaft of the drive mechanism.The center line of the valve disc seal and the valve stem rotation center line have a bias distance. The valve body is installed with seal components that are used to seal the valve disc.The gear and the positioning concave ring located in the front of the gear ring. The positioning ring is composed of more than two independent arc blocks. The shaft shoulder on each arc block is set in the positioning concave ring of the valve body and installed.The connecting parts on each arc block are connected to the pressure ring, and the tight ring is pressed to the stalling ring of the valve port on the neck of the valve body.The structure of the present invention is simple, and the replacement of the valve port sealing ring operation is fast and convenient, which can improve the sealing performance and service life.

Description

technical field [0001] The invention relates to a detachable ring sealing butterfly valve, which belongs to the technical field of sealing butterfly valves. Background technique [0002] The butterfly valve is mainly composed of a driving mechanism and a main valve mechanism. The valve stem connected to the valve disc can be rotated through the driving mechanism to drive the opening and closing of the valve disc and the valve seat, and has the function of separating the flowing medium. Since the sealing between the valve disc and the valve seat mainly depends on the sealing ring installed on the valve disc and the valve seat, and the valve disc requires frequent opening and closing actions, it is easy to cause damage to the sealing ring and reduce the working performance of the butterfly valve. This requires frequent replacement of the seal ring. And a kind of present sealing ring is installed in the groove of valve disc, not only the installation of sealing ring is inconve...

AI Technical Summary

Problems solved by technology

Since the sealing between the valve disc and the valve seat mainly depends on the sealing ring installed on the valve disc and the valve seat to achieve sealing, and the valve disc needs frequent opening and closing actions, it is easy to cause damage to the sealing ring and reduce the working performance of the butterfly valve. This requires frequent replacement of the seal

One of the current sealing rings is installed in the groove of the valve disc, which is not only inconvenient to install the sealing ring, but also has a large frictional resistance during work, which is easy to cause wear of the sealing ring.

The other is that the sealing ring is directly placed on the annular step surface of the valve disc, and the sealing ring is fixed by the pressure ring installed on the valve disc to improve the maintenance performance of the butterfly valve. However, the above two structures require the valve disc to be disassembled from the valve body. Replace the sealing ring after it is lowered, which increases the maintenance time

Secondly, in order to achieve a good sealing effect between the valve disc and the valve seat, it is usually necessary to adjust the sealing specific pressure of the valve disc to the valve seat sealing surface, and the sealing ring is set on the rotatable valve disc, because it is difficult to adjust the sealing ratio pressure, its sealing performance cannot be further improved

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