Integral cast-in method for sealing ring of hard-sealed gate valve body

Abstract

The invention relates to a method for integral imbedding of a seal ring of a valve body of a hard seal gate valve. The method comprises the four steps of preparation of a valve element, preparation ofa cavity, casting forming and finishing and modulation. By means of the method, on the one hand, the connecting and positioning stability and positioning precision of the valve element and the seal ring of the valve body are improved, the sealing stability and reliability of the valve body are effectively improved, and the service life of the valve element of the valve body is prolonged to a great extent; and on the other hand, the production and machining process is effectively simplified, the material loss in the machining process is greatly reduced, accordingly the cost of production and machining operation is effectively reduced, and meanwhile the working efficiency of the production and machining operation and the production and machining precision can be effectively improved.

Description

Technical field [0001] The invention relates to an integral inlay casting method for a hard seal gate valve body sealing ring, and belongs to the technical field of casting processing. Background technique [0002] At present, the valve body of hard seal gate valve adopts the method of mechanical processing and assembly. The sealing body adopts a copper ring. First, the cut copper ring is pressed into the groove of the valve body to make the valve body and the copper part integrated. The end face of the copper ring is processed to ensure the shut-off and sealing performance of the valve body. However, in order to ensure the firmness of the copper sealing body, while the valve body and the copper ring adopt an interference fit, they must be glued to ensure the sealing performance. Although it can meet the needs of valve body operation to a certain extent, the production process is relatively complicated, the processing operation cost and accuracy are relatively low, and the copper...

AI Technical Summary

Problems solved by technology

[0002] At present, the body seal of the hard-sealed gate valve adopts the method of mechanical processing and assembly. The sealing body adopts a copper ring. The end face of the copper ring is processed to ensure the shut-off and sealing performance of the valve body. However, in order to ensure the firmness of the copper seal body, the valve body and the copper ring must be glued to ensure the tightness while adopting an interference fit. Although it can meet the needs of the valve body operation to a certain extent, the production process is relatively complicated, the processing cost and precision are relatively low, and the copper ring is also easy to fall off due to external force impact and equipment loss, which leads to the stable operation of the current valve body equipment. In view of this problem, although the process of processing and production by casting molding has also been developed, although the accuracy and stability of the installation and positioning of the valve body and the copper ring for sealing have been effectively improved, the valve body and spool It is difficult to prepare the forming mold between the sealing copper ring and the process is complicated, and it is relatively difficult to demould in the later stage, and it is easy to cause damage to the surface quality of the workpiece, and the scrap rate is relatively high. In addition, in mold processing In the process, there are also phenomena such as difficult positioning of the sealing ring, poor positioning accuracy, and being easily impulsed by the molten metal during the casting process, which seriously affects the efficiency, accuracy and cost of the processing operation. Therefore, it is urgent to develop a new The processing method of the overall installation of the sealing ring of the hard-sealed gate valve body to meet the needs of actual production and use

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