Before the casting of valve castings, relevant personnel need to know the valve structure and valve overview in detail, such as blank weight, shape, size, etc. In this type of high temperature and high pressure valve casting, its structure and shape are almost the same. By observing the appearance of the casting, it is found that it is composed of three circular pipes, so its shape is tee tubular. Relevant personnel shall check the centerline of the pipeline to see whether it is in the same plane.
All pipes with the same axial direction are provided with flanges, and the thickness of the inner wall of the other pipe orifice is large. The nozzles of these pipes are processed products. The internal and external diameter dimensions of the three pipes are the same, so the valve casting is relatively uniform as a whole. Annular pipe is the main object of casting process. During casting, relevant personnel need to make all annular pipes have the same concentricity, control the wall thickness of each pipe and make its tolerance within the allowable range. However, according to the current casting process, it is still difficult to achieve the purpose. In the design of casting process, relevant personnel should also consider the simultaneous feeding of three pipelines.
The function and service environment of high temperature and high pressure valve castings are special, so the production and manufacturing process is also troublesome. During casting, valve castings will also have various defects, such as cracks, pores and other casting defects, which will affect the air tightness, performance and quality of valve castings. Relevant personnel should start from the source of casting defects and find solutions, Improve the manufacturing process and correct the casting process parameters so that such problems will not occur in the manufacturing of the next batch of valve castings. In addition, relevant personnel should also ensure that the size and specification of the casting meet the requirements to make it better match with the application object.