Double eccentric high-sealing butterfly valve

Abstract

The invention relates to a double eccentric high-sealing butterfly valve which is characterized in that a valve seat (4) is in a combination type, namely an elastic O-shaped ring (11) is wrapped in the valve seat (4) which is made of polytetrafluoroethylene materials, the elastic O-shaped ring (11) is made of fluorine rubber, the valve seat (4) is provided with a valve seat pressure cover (5), a valve body (1) and the valve seat pressure cover (5) are relatively and respectively provided with a valve body positioning gear (12) and a valve seat pressure cover positioning groove (13), the valve body positioning gear (12) is mutually meshed with the valve seat pressure cover positioning groove (13), the valve seat pressure cover (5) is fixed on the valve body (1) by adopting a bolt (14), a valve shaft (6) and a valve board (2) are correspondingly provided with pin grooves (15), and the valve board (2) and the valve shaft (6) are reinforced together by utilizing a pin (16), therefore, the invention increases the sealing force, provides more excellent sealing performance, prolongs the service life, and ensures that the valve board can be accurately closed and can keep stable sealing force.

Description

technical field [0001] The invention relates to a valve, in particular to a double-eccentric high-performance butterfly valve suitable for high-temperature, high-pressure, strong corrosion and other liquid medium or gas medium delivery pipelines. Background technique [0002] The double eccentric butterfly valve drives the rotation of the valve plate through the rotation of the valve shaft when it is working, so that the outer spherical surface of the valve plate is gradually squeezed towards the valve seat to play a sealing role, so there will be a lot of friction between the valve plate and the valve seat , so that the torque of the valve shaft increases, which often causes the gap between the valve shaft and the valve plate to become large and loose; and due to the frequent friction between the valve plate and the valve seat, the sealing surface of the valve seat is worn, and the sealing performance is reduced, which seriously affects the service life of the valve body. ...

AI Technical Summary

Problems solved by technology

[0002] When the double eccentric butterfly valve is working, the rotation of the valve shaft drives the rotation of the valve plate, so that the outer spherical surface of the valve plate is gradually squeezed towards the valve seat to play a sealing role, so there will be a lot of friction between the valve plate and the valve seat , the torque of the valve shaft becomes larger, which often causes the gap between the valve shaft and the valve plate to become larger and loose; and due to the frequent friction between the valve plate and the valve seat, the sealing surface of the valve seat wears and the sealing performance decreases, which seriously affects the Service life of the valve body

In addition, the seals of existing butterfly valves on the market are generally made of rubber. During the use of this butterfly valve, due to the characteristics of rubber, the applicable medium range is small, and the rubber is easily worn during the rotation of the valve plate, and the service life is low.

Images