High-temperature butterfly valve

Abstract

The invention relates to a high-temperature butterfly valve. The valve comprises a valve body, a valve rod, a valve plate and a sealing ring, wherein the valve plate is connected with the valve body through the valve rod. The valve is characterized in that: the valve body comprises a shell, an annular wall, a rib plate and a fire-resistant castable heat-insulation layer, wherein the annular wall is connected with the shell through the rib plate; and the fire-resistant castable heat-insulation layer is arranged between the valve shell and the annular wall. The sealing ring comprises two semilunar sealing seats, wherein the two semilunar sealing seats are rotationally arranged at 180 degrees relative to the axis of the valve plate. An axial compensating device is also arranged on the end part of the valve rod and comprises a push bearing and an adjusting bolt, wherein the tail part of the adjusting bolt is sequentially connected with a push bearing block, the push bearing and the end part of the valve rod. Compared with the prior art, the high-temperature butterfly valve has the advantages that: 1) the temperature of a suitable medium can be up to 750 to 950 DEG C, and the valve body with the fire-resistant castable heat-insulation layer has low heat loss and thermal deformation; and 2) the axial compensating device can be adjusted under the condition of thermal state, so that the influence of thermal expansion on sealing is overcome.

Description

Technical field [0001] The invention relates to the field of high-temperature raw gas pipeline valves, in particular to a high-temperature butterfly valve. Background technique [0002] At present, coal produces a large amount of high-temperature raw gas in the process of high-temperature carbonization in coke ovens. A large amount of ammonia water is usually sprayed to cool down during the production. A large amount of heat energy in raw gas is not used and was wasted in vain. A large amount of high-temperature raw gas is directly exported, and the waste heat boiler is used for heat exchange to produce medium-pressure or high-pressure steam, and can also be used for power generation. This will not only use waste heat, but also produce good economic value. However, the temperature of raw gas can reach 750-950℃, and the high temperature butterfly valve generally used in gas pipelines is designed to use the highest temperature of only 650℃. Excessive temperature will affect the ser...

AI Technical Summary

Problems solved by technology

However, the temperature of raw gas can reach 750-950°C, while the high-temperature butterfly valve generally used in gas pipelines is designed to operate at a maximum temperature of only 650°C. Excessively high temperatures will affect the service life and sealing performance of butterfly valves.

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