Double-seat type regulating valve and sealing structure and method thereof

Abstract

The invention discloses a double-seat type regulating valve and a sealing structure and method thereof. The sealing structure comprises a valve clack and a valve seat. An annular valve clack groove is coaxially formed in the top of a second column body of the valve clack, and the inner diameter of the valve clack groove is the same as the diameter of the cross section of a first column body. An elastic assembly, a first sealing piece and an inner ring which are annular are sequentially arranged in the valve clack groove from bottom to top. The upper portion of the inner ring extends into an assembling cavity, and the inner ring can slide up and down along the first column body. An annular valve seat groove is coaxially formed in the top of the valve seat located near the valve clack, the bottom of the valve seat groove is filled with the first sealing piece, the first sealing piece is provided with an outer ring capable of sliding up and down along the valve seat groove, and the bottom of the outer ring can completely seal the valve seat groove through the first sealing piece. The outer ring and the inner ring are fixedly connected through a connecting arm, and the outer ring, the inner ring and the connecting arm jointly form a sealing assembly. According to the double-seat type regulating valve and the sealing structure and method thereof, it can be completely guaranteed that two pairs of valve seats and valve clacks in the regulating valve are sealed at the same time, the structure is simple, and the manufacturing and replacing costs are low.

Description

technical field [0001] The invention belongs to the field of valve sealing, and in particular relates to a double-seat regulating valve and its sealing structure and method. Background technique [0002] The regulating valve is an important equipment for adjusting process parameters such as medium flow, pressure and temperature in the pipeline. Because the double-seat structure can reduce the axial force on the valve stem while ensuring the working pressure difference of the valve, reduce the flow rate of a single valve seat in the valve, and reduce the force on a single valve stem and spool, so it can be better Adapt to high-parameter working conditions. [0003] However, in the actual production process, it was found that when the double-seat control valve is closed, it needs to meet the sealing of two pairs of valve seats and valve discs at the same time, which puts forward extremely high requirements for the manufacturing accuracy of the valve stem and valve disc; Both...

AI Technical Summary

Problems solved by technology

[0003] However, in the actual production process, it was found that when the double-seat control valve is closed, it needs to meet the sealing of two pairs of valve seats and valve discs at the same time, which puts forward extremely high requirements for the manufacturing accuracy of the valve stem and valve disc; Both pairs of valve seats and discs can be in close contact, and replacing the material of the valve seat with elastic sealing material will reduce the strength of the valve seat, and it will be easily damaged and deformed, and the valve seat is not easy to repair and replace. This method will greatly increase the cost

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