Triple-eccentric sealing type butterfly valve

Abstract

The invention discloses a triple-eccentric sealing type butterfly valve which comprises a valve body, a valve plate and a valve rod, the valve rod is rotationally connected with the valve body, the valve plate is fixedly connected with the valve rod in the circumferential direction, the triple-eccentric sealing type butterfly valve further comprises an inflation sealing component, the inflation sealing component comprises a fixing part and an inflation part, and the fixing part surrounds the end of the valve plate; the inflation part is located at the end, close to the inner wall of the valve body, of the fixing part and is spaced from the inner wall of the valve body, an insertion hole is formed in the fixing part, an insertion pipe matched with the insertion hole is arranged on the side wall of the valve rod, an air channel communicated with the insertion hole and an inner cavity of the inflation part is formed in the fixing part, and a sliding groove is formed in the portion, above the valve body, of the valve rod. A connecting arm is arranged at the upper end of the piston and penetrates out of the opening, a spring is arranged at the position of the opening and abuts against the lower portion of the connecting arm, a one-way valve is arranged at the bottom of the sliding groove, an air cavity communicated with the one-way valve and the insertion pipe is formed in the valve rod, and an exhaust part used for exhausting air in the air cavity is arranged on the side wall of the valve rod. After being inflated and expanded, the inflation part is tightly attached to the inner wall of the valve body.

Description

technical field [0001] The invention relates to the field of butterfly valves, in particular to a triple-eccentric sealing butterfly valve. Background technique [0002] Butterfly valve is a kind of regulating valve with simple structure, which can be used for switch control of low-pressure pipeline medium. It mainly plays the role of cutting off and throttling in pipeline. The valve plate will frequently generate friction during the opening and closing process, which will lead to serious wear after long-term use, resulting in a generally short service life. The triple eccentric sealing butterfly valve can improve certain friction during the opening and closing process through eccentric settings. However, in order to ensure the sealing requirements, the friction and wear of the valve seat and valve plate of the butterfly valve due to contact cannot be avoided in general. Contents of the invention [0003] The object of the present invention is a triple eccentric sealing b...

AI Technical Summary

Problems solved by technology

[0002] Butterfly valve is a kind of regulating valve with simple structure, which can be used for switch control of low-pressure pipeline medium. It mainly plays the role of cutting off and throttling in pipeline. The valve plate will frequently generate friction during the opening and closing process, which will lead to serious wear after long-term use, resulting in a generally short service life. The triple eccentric sealing butterfly valve can improve certain friction during the opening and closing process through eccentric settings. However, in order to ensure the sealing requirements, the friction and wear caused by the contact between the seat and the valve plate of the butterfly valve cannot be avoided in general.

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