Method for machining long-distance transport pipe all-welded ball valve
An all-welded ball valve and processing method technology, which is applied in welding equipment, metal processing equipment, gas flame welding equipment, etc., can solve problems such as waste, high requirements for working conditions, and troublesome users, so as to improve production efficiency and save energy. Consumption, resource saving and cost effects
Inactive Publication Date: 2013-05-01
陈乃昶
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Problems solved by technology
[0002] Buried products are required to be buried deep underground, and the product requirements can be adapted to various geological surfaces, especially temperature, corrosion and resistance to qualitative changes in various soils. Therefore, the requirements for operating conditions are very high. The project has very strict requirements for valves, and the valves are required to have High wear resistance, erosion resistance, anti-scaling, anti-scarring and fast cutting functions, so the requirements for working conditions are very high. The existing domestic products are replaced after one week of use, causing great trouble and waste to users.
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[0007] The valve body (1) is spherical in shape, and the new material NORSOK, M501, REV.5 is used for surface treatment and protective coating technology; the valve stem (5) is elongated, and the ball (3) uses two fast rectangular support plates (8) Supported, and fixed on the left and right valve bodies (2) with pins (10); there are two welded grooves (20) between the middle valve body and the left and right valve bodies (2) to form a V-shaped narrow gap, using narrow slit filaments The SAW-1 of the girth welding process formulates PQR and WPS design technologies for weld and HAZ; the welding groove (20) arranges V-shaped butt joints and the single-pass weld thickness does not exceed 12.7 mm technology, achieving an orderly process law , the back layer weld bead has completed the repeated heating of the front layer weld bead, played the role of tempering the front layer weld bead, and completed the purpose of automatic tempering; the welding groove (20) adopts a narrow bead de...
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The invention relates to a method for machining a long-distance transport pipe all-welded ball valve, wherein two V-shaped narrow-interval welding grooves are arranged between an intermediate valve body and left and right valve bodies, and the thickness of a single welded seam of each V-shaped welding groove and a butt joint is not over 12.7mm; the surface of a ball and the surfaces of a seal pair are made from a supersonic cold-spraying new tungsten carbide material, or the surface of the ball is subjected to high-temperature oxyacetylene overlaying welding process under high temperature of 800-950 DEG C; and the new tungsten carbide is prepared by adding titanium element powder of 8-10% to tungsten carbide powder of 35%. The method for machining the long-distance transport pipe all-welded ball valve, disclosed by the invention, has the advantages of improving the crack resistance and impact toughness of a welded joint, reducing the stress repeatability, improving the hardness of the surfaces of the ball and the seal pair, prolonging the service life of products, improving the performances of the products, saving the energy source and the cost and improving the production efficiency, and is suitable for long-distance transport pipes.
Description
Technical field: [0001] The invention relates to a pipeline valve processing technology, especially a pipeline full-welded ball valve processing technology that is always applied under the special working conditions of high hardness, high pressure and high flow rate Background technique: [0002] Buried products are required to be buried deep underground, and the product requirements can be adapted to various geological surfaces, especially temperature, corrosion and resistance to qualitative changes in various soils. Therefore, the requirements for operating conditions are very high. The project has very strict requirements for valves, and the valves are required to have High wear resistance, erosion resistance, anti-scaling, anti-scarring and fast cutting functions, so the working conditions are very demanding. The existing domestic products are replaced after one week of use, causing great trouble and waste to users. Invention content: [0003] Aiming at the deficiencie...
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IPC IPC(8): F16K5/06F16K27/06B23K5/18B23K33/00
Inventor 陈乃昶
Owner 陈乃昶