Method for processing butterfly plate device of butterfly valve body

Abstract

The invention relates to a method for processing a butterfly plate device of a butterfly valve body. The butterfly plate device comprises a butterfly plate, a butterfly plate axle hole, a main shaft section, a connecting plate shaft section and a fixed shaft section, wherein butterfly plate is made by stamping or casting; the radial concentric rectangular butterfly plate axle hole is formed in the center line of the butterfly plate; the connecting plate shaft section is arranged in the rectangular butterfly plate axle hole; a valve rod of a butterfly valve is divided into three sections in a coaxial way; on a lathe, a cylindrical steel bar is turned into the cylindrical main shaft section and the connecting plate shaft section, and the diameter of the cylindrical steel car is larger than the diagonal length of the butterfly plate axle hole; the diameter of the fixed shaft section is smaller than the length of the rectangular straight side of the butterfly plate axle hole; the connecting plate shaft section is planed on the cylindrical valve rod of the butterfly valve, and the cylindrical valve rod of the butterfly valve is fixed on a planer; the valve rod of the butterfly valve is planed into a corresponding rectangle smaller than the butterfly plate axle hole and then is installed into the butterfly plate axle hole. The design is reasonable; the butterfly plate axle hole is designed into a square shape, the square connecting plate shaft section corresponds to the butterfly plate axle hole, and the valve rod is closely matched with the butterfly plate, so that a fixing pin is not needed for fixing, water leakage point positions and sliding pins which are caused during processing and manufacturing can be reduced, the butterfly plate device is firm and durable, and the service life is prolonged.

Description

technical field [0001] The invention relates to the processing of a valve device of a pipeline, in particular to a processing method of a butterfly plate device of a butterfly valve body. Background technique [0002] The original butterfly plate and valve stem are separated, and there is a reserved hole in the middle of the butterfly plate. Most of the valve stems are round rods. Then drill a hole and hit a fixing pin to connect the valve stem and the butterfly plate. Once the fixing pin is damaged after long-term use, it will cause the empty shaft to rotate. When the butterfly plate is cast, there must be reserved holes to ensure the centrality of the machining. If there is an error, it will cause uneven force on the left and right after the butterfly plate is installed, and the butterfly plate will be broken under pressure. The cooperation between the butterfly plate and the valve stem requires the valve stem to be inserted into the center hole of the butterfly plate and...

AI Technical Summary

Problems solved by technology

[0002] The original butterfly plate and valve stem are separated, and there is a reserved hole in the middle of the butterfly plate. Most of the valve stems are round rods. Then drill a hole and hit the fixing pin to connect the valve stem and the butterfly plate. Once the fixing pin is damaged after long-term use, it will cause the empty shaft to rotate.

When the butterfly plate is cast, there must be reserved holes to ensure the centrality of the machining. If there is an error, it will cause uneven force on the left and right after the butterfly plate is installed, and the butterfly plate will be broken under pressure.

To match the butterfly plate with the valve stem, the valve stem should be inserted into the center hole of the butterfly plate and the fixing pin should be drilled. There will also be leakage from the fixing pin.

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