Sealing structure for butterfly valve rod

Abstract

The invention discloses a sealing structure for a butterfly valve rod. The sealing structure comprises a valve seat, a valve cover and a valve rod; a sealing pressing ring is arranged between the valve seat and the valve cover; the sealing pressing ring is arranged on the valve rod in a sleeving mode; the valve rod is sleeved with an O-shaped sealing ring; the sealing pressing ring is arranged above the O-shaped sealing ring in a pressing mode; connecting through grooves corresponding to bolt holes in the valve seat and the valve cover are formed in the ring face of the sealing pressing ring;and bolts penetrate through the bolt holes in the valve seat, the connecting through grooves in the sealing pressing ring and the bolt holes in the valve cover so that the valve seat, the sealing pressing ring and the valve cover can be pressed and fixedly connected. Under the condition that fuel gas is not stopped, the problem of gas leakage of the butterfly valve rod is effectively solved, the maintenance cost is greatly reduced, installation is convenient and rapid, and the maintenance efficiency is high; and the sealing pressing ring is made of metal, so that the safety performance is good, the service life is long, and the cost is low.

Description

Technical field: [0001] The invention relates to a sealing structure, in particular to a sealing structure for a butterfly valve stem. Background technique: [0002] In the process of gas transmission and distribution, butterfly valve is an indispensable part of gas facilities. The gas pipelines that we usually use are all underground, and the valves that control gas delivery are mostly arranged in underground valve wells. However, the butterfly valve stem in the valve well will leak air from the butterfly valve stem due to factors such as medium erosion, temperature changes, self-wear, and aging of the sealing ring. Once the valve stem of the butterfly valve leaks, there is a great potential safety hazard. The concentration of the leaked gas in the confined space reaches 5%, and it will explode when it encounters an open flame, which is very dangerous. [0003] At present, repairing or replacing the butterfly valve due to air leakage from the butterfly valve stem needs to...

AI Technical Summary

Problems solved by technology

The butterfly valve stem in the valve well will leak air from the butterfly valve stem due to factors such as medium erosion, temperature changes, self-wear, and aging of the sealing ring.

Once the valve stem of the butterfly valve leaks, there will be a great potential safety hazard. The concentration of the leaked gas in the confined space reaches 5%, and it will explode when it encounters an open flame, which is very dangerous.

[0003] At present, repairing or replacing the butterfly valve due to air leakage from the butterfly valve stem needs to stop the gas supply, and then replace and remove all the gas in the gas pipe network before it can be implemented. However, the amount of gas removed in the pipe network is huge, which takes a long time A large amount of gas is wasted and the maintenance cost is high; if the gas pipeline network design adopts the method of one butterfly valve for one standby and one for use, the pipeline network design is complicated and the equipment investment cost is high. Butterfly valve stem leakage caused by factors such as

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