Multiply sealed corrugated pipe stop valve

Abstract

The invention discloses a multiply sealed corrugated pipe stop valve, which comprises a valve body, a valve cover, a valve rod and a corrugated pipe assembly, wherein the valve cover is connected onto the valve body in a sealing way, the corrugated pipe assembly is arranged in the valve cover, the lower end of the valve rod stretches into the valve cover to be connected with the corrugated pipe assembly, the upper end of the valve rod stretches out of the valve cover, the junction of the lower end of the corrugated pipe assembly and the valve body is provided with a first sealing structure which is dually sealed in the axial direction and the radial direction, and the junction of the upper end of the valve rod cover and the valve rod is provided with a second sealing structure which is dually sealed in the axial direction and the radial direction. Through the first sealing structure, metal particles generated by the friction of the corrugated pipe assembly and the valve body can be effectively prevented from entering the inner cavity of the valve during the assembling process, conductive metal particles can be prevented from leaking into a pipeline and a device with a stop valve, and the performance of the device can be guaranteed; and through the second sealing structure, a sealing effect can be still realized when the corrugated pipe assembly is damaged or the sealing between the corrugated pipe assembly and the valve body loses effectiveness.

Description

technical field [0001] The invention relates to a multiple sealing bellows cut-off valve. Background technique [0002] The current bellows stop valve is basically sealed by the bellows assembly and the valve body by pressing the gasket on the top end of the valve body (for axial compression seal), and the metal produced by the friction between the bellows assembly and the valve body during assembly The powder particles will enter the inner cavity of the valve and travel through the entire pipeline and equipment equipped with bellows globe valves. Metal powder particles are conductors, which will cause equipment failure (such as high-voltage switch insulation devices). When it is installed on the equipment and runs for a long time, due to the influence of vibration, there may be looseness between the bellows assembly and the valve body, the sealing gasket between the bellows assembly and the valve body will fail, and the medium will leak; in addition, only the bellows assemb...

AI Technical Summary

Problems solved by technology

[0002] The current bellows stop valve is basically sealed by the bellows assembly and the valve body by pressing the gasket on the top end of the valve body (for axial compression seal), and the metal produced by the friction between the bellows assembly and the valve body during assembly The powder particles will enter the inner cavity of the valve and travel through the entire pipeline and equipment equipped with bellows globe valves. Metal powder particles are conductors, which will cause equipment failure (such as high-voltage switch insulation devices). When it is installed on the equipment and runs for a long time, due to the influence of vibration, there may be looseness between the bellows assembly and the valve body, the sealing gasket between the bellows assembly and the valve body will fail, and the medium will leak; in addition, only the bellows assembly has a double seal , due to the limitations of the current technology and material level, after a certain number of times, the bellows itself may be damaged or the gap between the welds may cause medium leakage; the solution of welding the bellows components and the valve body cannot be disassembled and repaired, and can only be replaced Bellows globe valve, higher cost

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