A double-cone sealing structure for safety valve and its application

Abstract

The invention provides a double-cone sealing structure for a safety valve and its application, including a valve seat, a recoil disc and a sealing block, the valve seat is a hollow boss structure, and the top of the hollow cavity is machined with an annular cone with a big end facing upwards. The sealing block is fixed between the valve seat and the recoil plate. The lower end of the sealing block is machined with two cone surfaces with different angles. The cone angle of the first cone surface is smaller than the cone angle of the second cone surface. The intersection of the conical surfaces forms a first sharp angle, and the annular conical surface forms a second sharp angle on the upper surface of the valve seat. During the initial sealing, the first sharp angle is in contact with the annular conical surface on the valve seat for sealing. When the first sharp corner moves downward under the influence of shrinkage deformation, the second sharp corner of the valve seat contacts and seals with the first conical surface of the sealing block. In the invention, the low temperature deformation of the sealing block is small, and it has a double-angle conical surface sealing structure, which can well solve the safety valve leakage and early jumping caused by the large shrinkage deformation and insufficient sealing specific pressure under the low temperature working condition. question.

Description

technical field [0001] The invention belongs to the technical field of safety valve design, and in particular relates to a double cone surface sealing structure for a safety valve and its application. Background technique [0002] The safety valve is an important overpressure protection device for pressure vessels and process systems. When the medium is overpressured, the valve can automatically open to discharge a rated amount of fluid, and automatically close when the pressure drops to prevent the medium from flowing out. Low temperature safety valve is one of the main branches of safety valve products. It is mainly used in the manufacture, storage and transportation of ethylene, polysilicon devices, low temperature hydrogen, oxygen, argon and other special gases. Due to the flammable, explosive and expensive characteristics of the medium, the sealing performance of the safety valve is very high, and the safety valve with an elastic sealing structure is usually selected to...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiencies in the prior art, the inventors have carried out intensive research and provided a sealing block with a small low-temperature deformation and a double-angle conical sealing structure, which well solves the problem of the safety valve under low-temperature conditions. Due to the large amount of shrinkage deformation and insufficient sealing specific pressure, the leakage of the safety valve and the problem of early take-off, thus completing the present invention

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