Double-slope eccentric butterfly valve

Abstract

The invention provides a double-slope eccentric butterfly valve. The double-slope eccentric butterfly valve comprises a valve body, a valve rod, a valve plate and a metal sealing socket, wherein an inlet, an outlet and a valve cavity capable of communicating the inlet with the outlet are arranged in the valve body, a shaft hole is formed in the valve cavity part of the valve body, and the valve rod penetrates through the shaft hole to be fixedly connected with the valve plate; a metal valve seat integrated with the valve body into a whole is arranged on the valve body, and the valve plate is driven by the valve rod to open and close on the metal valve seat; the metal sealing socket is arranged on the valve plate in a clamping manner through a sealing ring cover plate and is in seal fit with the metal valve seat; a first gap and a second gap communicated with one another are formed between the metal sealing socket and the valve plate, a metal C-ring is arranged in the first gap, and the metal C-ring is partially embedded in a groove formed on the surface of the valve plate; a self-sealing combined structure is arranged in the second gap. According to the double-slope eccentric butterfly valve provided by the invention, the integrated metal seating socket and a floating sealing structure are adopted, and the service life and usability of the butterfly valve are remarkably improved.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a double-slope eccentric butterfly valve. Background technique [0002] The traditional triple eccentric butterfly valve adopts a multi-layer sealing structure (a combination of metal graphite, tetrafluoroethylene or asbestos), although the sealing structure has good elasticity, it is easy to ensure that the product is qualified for zero leakage. But this structure also has defects: 1) The sealing principle of the traditional structure still relies on the elastic sealing deformation of the sealing seat to generate a large specific pressure, and the sealing is still sealed by graphite or asbestos, and the metal only plays the role of skeleton support, graphite and asbestos The hardness is very low, so in the working condition with particles, the traditional multi-layer seal is easy to damage. 2) The deformation of the sealing surface of the valve is relatively large when switching, so the f...

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Problems solved by technology

But this structure also has defects: 1) The sealing principle of the traditional structure still relies on the elastic sealing deformation of the sealing seat to generate a large specific pressure, and the sealing is still sealed by graphite or asbestos, and the metal only plays the role of skeleton support, graphite and asbestos The hardness is very low, so in the working condition with particles, the traditional multi-layer seal is easy to damage

2) The deformation of the sealing surface of the valve is relatively large when switching, so the friction and wear of the sealing surface is relatively serious at the moment of closing, which affects its life

3) Due to the thermal expansion and contraction of materials at low temperature, the thickness of tetrafluoroethylene, graphite and asbestos sealing seats will become thinner, so that there will be gaps between the sealing seat and the cover plate, resulting in leakage

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