High-pressure, high-alloy, large-diameter check valve for hydrocracking and its casting process

Abstract

A high-pressure, high-alloy, large-diameter check valve for hydrocracking, with a design pressure of CL2500, a nominal size of DN≥400, and a wall thickness of ≥130mm. The end of the valve body is also provided with a flange connection structure. It has laid a foundation for my country to manufacture valves for high-pressure and large-diameter special materials and devices, and also filled the gap in this field in my country. At the same time, an additional flange is designed on the end of the valve body of the present invention, which can make the expensive high-pressure, CF8C high-alloy, and large-diameter butt-welded hydrogenation valves repeatedly used after a certain period of use after simple maintenance and pressure testing. Use, thereby greatly reducing the cost of using valves for high-pressure hydrogenation systems.

Description

technical field [0001] The invention belongs to the technical field of valve manufacturing, and in particular relates to a high-pressure, high-alloy, large-diameter check valve for hydrocracking and a casting process thereof. Background technique [0002] The hydrogenation valve is an important pipeline component of the hydrogenation system in the production of petroleum refining and chemical industry. The hydrogenation process is an important process measure for the deep processing of petroleum refining (including the rising coal-to-oil). It can not only improve the recovery of light oil from crude oil It is an ideal device for desulfurization of oil products, which can improve the quality of fuel oil, reduce the pollution of fuel oil to the environment, and thus improve the overall economic and social benefits of the refinery. [0003] With the development of industry, the demand for hydrogenation valves is increasing day by day, and the demand for high-pressure, high-allo...

AI Technical Summary

Problems solved by technology

However, it is difficult to cast and process such valves, and when the pressure is CL2500 and the nominal size DN≥400, there are no ready-made standards to refer to and quote, such as American (ASME, API) standards, British (BS) standards and international (ISO) standards The structural length and reference wall thickness of CL2500 and DN≥400T check valves are not included, and there are no relevant design standards for such high pressure, large diameter, butt welding connection structure and flange connection structure in China

At the same time, the extra-thick high-pressure, high-alloy CF8C stainless steel hydrogenation valve body with a wall thickness of more than 130mm must ensure that there are no cracks, shrinkage porosity, or any defects below the level II of the radiographic flaw detection inspection, which increases the difficulty in casting.

Images