Self-centering valve seat

Abstract

The invention relates to a self-centering valve seat. The self-centering valve seat is characterized by comprising a valve seat supporting flange (2) fixedly installed at an opening of a waste heat boiler center tube (1); a valve seat pressing flange (3) is detachably installed on the valve seat supporting flange (2); and a valve seat (4) is installed between the valve seat supporting flange (2) and the valve seat pressing flange (3). The self-centering valve seat is particularly suitable for occasions where a valve element and a valve seat cannot be easily centered in a waste heat boiler, and damage is likely to happen at the high temperature. The problem of non-centering caused by installation of an upper valve of the waste heat boiler and heating and deforming of a valve rod can be well solved, the valve seat can be used as a spare part for replacement and use, operation is simple, and time and labor are saved.

Description

technical field [0001] The invention relates to a self-aligning valve seat. Background technique [0002] Existing fire-tube waste heat boilers are often equipped with a large-diameter central tube for high-temperature process gas to flow out, and a spherical regulating valve for adjusting the flow is provided at the end of the central tube, and the valve seat of the regulating valve is the central tube welded in the waste heat boiler. In general, the coaxiality between the inner hole of the valve seat and the inner hole of the boiler flange is difficult to guarantee. If the valve stem is deformed due to high temperature heating, the accumulated error will be more serious, and the temperature here is very high. When the regulating valve is closed, the valve The seat is affected by the external force from the valve core. The welded seat is easily damaged and the regulating valve loses its regulating performance, and it is more difficult to replace the valve seat. It is necess...

AI Technical Summary

Problems solved by technology

[0002] Existing fire-tube waste heat boilers are often equipped with a large-diameter central tube for high-temperature process gas to flow out, and a spherical regulating valve for adjusting the flow is provided at the end of the central tube, and the valve seat of the regulating valve is the central tube welded in the waste heat boiler. In general, the coaxiality between the inner hole of the valve seat and the inner hole of the boiler flange is difficult to guarantee. If the valve stem is deformed due to high temperature heating, the accumulated error will be more serious, and the temperature here is very high. When the regulating valve is closed, the valve The seat is affected by the external force from the valve core. The welded seat is easily damaged and the regulating valve loses its regulating performance, and it is more difficult to replace the valve seat. It is necessary to manually cut off the damaged valve seat and then replace it with welding, which brings inconvenience to installation and use. It is very inconvenient, time-consuming and labor-intensive, and increases the economic loss of users

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