A hydrogenation valve and its processing method

Abstract

The invention discloses a hydrogenation valve and a machining method thereof. The machining method comprises the steps of preparing or selecting suitable self-lubricating high polymer materials according to the characteristic requirements for a hydrogenation valve pressing plate and a valve rod connecting nut, utilizing the high polymer material coating surface treatment technology for coating the surface of a valve rod with the self-lubricating high polymer materials, solidifying the coated self-lubricating high polymer materials for more than 30 min at room temperature, and then conducting automatic friction center adjusting cooperation on the hydrogenation valve movable joint nut and the valve rod with the surface coated with the self-lubricating high polymer materials. The hydrogenation valve and the machining method of the hydrogenation valve have the advantages that the coaxiality of the conical surfaces of the two ends of the valve rod of the hydrogenation valve does not need to be ensured; the self-lubricating high polymer materials coating the surface of the valve rod have good friction resistance and good wear resistance, and the hardness of the self-lubricating high polymer materials is lower than that of the valve rod connecting nut making contact with the self-lubricating high polymer materials, so that the automatic friction center adjusting cooperation is carried out on the valve rod and the valve rod connecting nut, the phenomena that due to the facts that eccentricity is excessive and the valve rod is extruded, the valve rod is abraded and broken, and the valve rod connecting nut is abraded are avoided, and meanwhile the pressing plate is prevented from being scratched.

Description

Technical field [0001] The invention relates to a valve, more specifically, to a hydrogenation valve and a processing method thereof. Background technique [0002] The hydrogenation valve is a matching valve for the petrochemical company's hydrogenation unit. Its basic function is to connect or cut off the flow of pipeline medium, change the flow of fluid, change the flow direction of the medium, adjust the pressure and flow of the medium, and protect the pipeline equipment Normal operation. Because hydrogen is a flammable and explosive gas, the sealing requirements of the valve are extremely strict, especially the outer seal does not allow any leakage. In addition, the parts in contact with the medium must be prevented from hydrogen embrittlement. At present, domestically produced hydrocracking high-pressure valves mainly have the following problems in engineering use: valve body leakage, leakage at the connection between the valve cover and the valve body, and valve stem fract...

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Problems solved by technology

[0003] The technical problem of the present invention is that the traditional metal hydrogenation valve valve stem and the valve stem connecting nut require high machining accuracy. During the use of the hydrogenation valve, there is often an eccentricity between the hydrogenation valve valve stem and the valve stem connection nut, resulting in the failure of the hydrogenation valve. The wear of the valve stem and the connecting nut of the valve stem and the wear of the pressure plate will cause problems such as hydrogen leakage and valve stem fracture, which will affect the service life and sealing effect of the hydrogenation valve

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