Three-eccentric cut-off butterfly valve of blast furnace

Abstract

The invention discloses a three-eccentric cut-off butterfly valve of a blast furnace. The butterfly valve comprises a valve body, a valve rod and a butterfly plate, wherein the valve rod is installed on the valve body; the butterfly plate is fixedly connected with the valve rod and rotates in the valve cavity of the valve body around the valve rod; a butterfly plate seal ring is arranged on the step of the periphery of a butterfly plate body, and an annular winding pad is arranged between the end surface of the butterfly plate seal ring and the step surface of the periphery of the butterfly plate body; the butterfly plate seal ring and the valve seat plane of the valve body constitute a special-shaped conical surface seal pair; and a spring packing pre-tensional structure is arranged between the inner hole of the valve body and the valve rod; and in the spring packing pre-tensional structure, a nano-electroplating self-lubricating shaft sleeve, a lubricating ring, packing and a press sleeve are successively arranged between the inner hole of the valve body and the valve rod, a butterfly-shaped spring is placed on the step of the press sleeve and is compacted by a press plate via a fastener, and the press plate is connected with the valve body. The three-eccentric cut-off butterfly valve has the advantages of small volume, light weight, seal reliability, small start and stop power and high cost performance, the phenomena of suspend production and stopped blast of the blast furnace because external leakage and internal leakage often occur in the blast furnace are effectively avoided. Thus, the three-eccentric cut-off butterfly valve can be adaptive to low temperature medium cut-off working conditions of a blast furnace iron-making system.

Description

[0001] technical field [0002] The invention relates to a cut-off butterfly valve used in the field of blast furnace ironmaking, in particular to a triple-eccentric cut-off butterfly valve for a blast furnace. Background technique [0003] In the hot blast stove system of ironmaking blast furnace, a large number of cut-off valves are used, such as cold air valve, combustion air cut-off valve, gas cut-off valve and flue valve. Traditional cut-off valve products are mostly wedge gate valves, which have a long service life, but the disadvantages are bulky structure, large installation space, high cost, difficult maintenance, and poor sealing performance. In order to change this situation, a triple eccentric butterfly valve appeared later. The triple eccentric butterfly valve is small in size and light in weight. Normal smelting operation makes blast furnace smelting unable to carry out normal operation, which brings great economic losses to users; if it is used to cut off ga...

AI Technical Summary

Problems solved by technology

Traditional cut-off valve products are mostly wedge gate valves, which have a long service life, but the disadvantages are bulky structure, large installation space, high cost, difficult maintenance, and poor sealing performance

In order to change this situation, a triple eccentric butterfly valve appeared later. The triple eccentric butterfly valve is small in size and light in weight. Normal smelting operation makes blast furnace smelting unable to carry out normal operation, which brings great economic losses to users; if it is used to cut off gas, there may be internal leakage and external leakage, and gas explosion may occur, endangering the personal safety of on-site staff; valves Once internal leakage occurs, the gas will severely wash the butterfly plate and valve body, which greatly shortens the service life of the valve. Therefore, it is necessary to develop a shut-off valve with high efficiency, long life, good sealing performance, small size, light weight and reliable use.

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