Improved ball valve

Abstract

The invention relates to an improved ball valve. Left and right valve bodies have all-welded forged steel structures; a stuffing box is connected with the valve bodies by welding; a stop pin is arranged on the stuffing box, and is matched with a ring groove face of a valve rod; a ball body has a fixed structure; a carbon tungsten alloy is sprayed on the surfaces of the ball body and a valve seat by an ultrasonic method; the hardness of a sealing face reaches HV900-1200; and spraying thickness is more than or equal to 25mu m. The improved ball valve has the advantages that: under the conditionof the same strength, the wall of an all-welded ball valve forged piece can be very thin, so that the weight of the valve can be reduced by one quarter, and the resistance to bending and extrusion ofpipelines is increased; and overall dimension is reduced, the structure is compact, installation space is saved, the curve inside the welding structure of the valve body is smooth, the pipelines are smoothly connected without dead angle, and media have high fluidity. The carbon tungsten alloy is sprayed on the ball body and the valve seat by the ultrasonic method, so that abrasion and corrosion can be resisted, the strength between an overlaying layer and a substrate reaches a metallurgical bonding level and the improved ball valve is enough to bear the impact of high-pressure media.

Description

[technical field] [0001] The invention relates to the technical field of ball valves, in particular to an improved ball valve. [Background technique] [0002] At present, the valve body of the existing ball valve is a split structure. The wall thickness of the ball valve forging of the ball valve with this structure is very thick, the weight of the valve is heavy, and the resistance to bending and extrusion of the pipeline is weak. Complex, large installation space, often hidden dangers of leakage channels. The internal curve of the valve body is not smooth, and there is a dead angle in the smooth connection with the pipeline, and the fluidity of the medium is poor. At the same time, due to the split structure, the sealing effect is also very poor. [0003] In addition, the surface of the ball and the valve seat of the existing ball valve bears the strong erosion of the high-pressure throttling medium, which is easy to wear and corrode. If the soft sealing structure is ad...

AI Technical Summary

Problems solved by technology

[0002] At present, the valve body of the existing ball valve is a split structure. The wall thickness of the ball valve forging of the ball valve with this structure is very thick, the weight of the valve is heavy, and the resistance to bending and extrusion of the pipeline is weak. Complex, large installation space, often hidden dangers of leakage channels

The curve inside the valve body is not smooth, there is a dead angle in the smooth connection with the pipeline, and the fluidity of the medium is poor

At the same time, due to the split structure, the sealing performance effect is also very poor

[0003] In addition, the surface of the ball and seat of the existing ball valve is subjected to strong erosion by the high-pressure throttling medium, which is easy to wear and corrode

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