Two-way sealing butterfly valve

Abstract

The invention discloses a two-way sealing butterfly valve which comprises a valve body, a butterfly plate installed in the valve body, a valve seat two-way sealing assembly installed in the valve body, and a valve rod connected with the butterfly plate and used for driving the butterfly plate to open or close a valve body medium channel. The valve body medium channel is obliquely arranged, and an included angle of 2-5 degrees is formed between the axial direction of the valve body medium channel and the horizontal direction; the valve seat two-way sealing assembly comprises an O-type sealing ring, a basin-shaped sealing ring and a pressing ring, the O-type sealing ring is installed in a valve seat groove, the basin-shaped sealing ring presses the O-type sealing ring and falls into the valve seat groove, the pressing ring abuts against the basin-shaped sealing ring, and the pressing ring limits the basin-shaped sealing ring in the valve seat groove in an adjustable mode. The two-way sealing butterfly valve has the advantages of being simple in structure, convenient to manufacture, reliable in use and high in practicality, is good in sealing effect, and reduces damage to the sealing surface of the butterfly valve; besides, few medium residues exist, pollution of the original residual mediums on new mediums is reduced when different mediums are adjusted for use, and the possible permeation action of the residual mediums is avoided; meanwhile, operation torque can be lowered.

Description

technical field [0001] The invention relates to a butterfly valve, in particular to a bidirectional sealing butterfly valve, which belongs to the field of valves. Background technique [0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure, and it can also be used for switch control of low-pressure pipeline medium. Butterfly valve refers to a valve whose closing part is disc or butterfly plate, which rotates around the valve shaft to open and close. It mainly plays the role of cutting and throttling on the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. Butterfly valves are suitable for pipelines conveying various corrosive and non-corrosive fluid media in engineering systems such as generators, gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smel...

AI Technical Summary

Problems solved by technology

[0003] However, in the actual operation of the butterfly valve, there are disadvantages of poor sealing performance and unreliable sealing; at the same time, the medium channel is arranged along the horizontal direction, which will cause some When the old residual medium pollutes the new medium, and the residual medium will penetrate the sealing part of the butterfly valve, long-term penetration will reduce the sealing performance of the butterfly valve

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