High-temperature high-pressure ultralow sulfur-and-phosphorus valve body casting forming process

Abstract

The invention relates to the technical field of valve body casting and discloses a high-temperature high-pressure ultralow sulfur-and-phosphorus valve body casting forming process. A plane in which the centers of three pipe openings of a high-temperature high-pressure ultralow sulfur-and-phosphorus valve body casting part are located is used as a parting surface, first dead heads are arranged right above the three pipe opening respectively, second dead heads are arranged above the intersected positions of all pipes of the valve body casting part respectively, a plurality of chilling blocks are arranged under the intersected positions of all the pipes of the valve body casting part respectively, the chilling blocks are separated from the casting part by chromium ores, a bottom-returning type pouring system is adopted for pouring, a cross gate is positioned under the valve body casting part and is connected with a plurality of inner gates on the same horizontal plane, and an outlet in the top end of each inner gate is formed in the wall, close to the end surface, of the corresponding pipe opening. The valve body produced by adopting the casting forming process has the good casting forming quality, the formed matrix structure is compact, the CAE (Computer Aided Engineering) simulation technique is adopted, the production period of the casting part is shortened, the casting part manufacturing process is reasonably optimized, models and molding materials can be saved, the casting part production cost is reduced and the high economic benefit is achieved.

Description

technical field [0001] The invention relates to the technical field of valve body casting, in particular to an ultra-low-sulfur phosphorus high-temperature and high-pressure valve body casting process with well-formed valve body castings and a dense matrix structure. Background technique [0002] The hydrogenation valve used in the high-pressure hydrogenation unit, because the high-pressure hydrogenation unit is facing hydrogen, high pressure and accompanied by hydrogen sulfide corrosion, it should be made of cast steel with hydrogen corrosion resistance and hydrogen sulfide corrosion resistance according to the ambient temperature of the valve. . The hydrocracking high-pressure valve currently produced in China mainly has the following problems in engineering use: valve body leakage (casting valve body has sand holes, cracks, etc.), internal leakage of valve sealing surface, stuffing box seal leakage, valve cover and valve body connection It is easy to leak, the valve stem...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an ultra-low-sulfur phosphorus high-temperature and high-pressure valve body casting molding process to solve the problem that shrinkage cavities, shrinkage porosity, and cracks are easy to occur in the casting process of the valve body castings of the hydrogen valve, and the high-temperature molten steel is easy to stick to sand. The problem that the quality of finished products cannot meet the requirements

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