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Pipeline ball valves are designed to meet the requirements of users in the vulcanization environment. We design, material selection, manufacturing, testing, surface treatment and painting are strictly in accordance with the relevant standards of the American Society of Corrosion Engineers NACE . . The line ball valve series not only has a wide selection of materials, but also the inner material is nickel-plated or 316 , and the sealing ring is made of special polymer material. Alloy steel valve not only anti-corrosion, anti-vulcanization, strong ability, fireproof, anti-static, good sealing performance, suitable for a wide range of pressure and temperature, full diameter and diameter reduction, and can be equipped with a variety of driving devices, is chemical, petroleum refining The ideal valve choice for natural gas extraction and delivery systems.
Pipeline Ball Valve For China, belong to the golden age, accounting for 1/4 of the world's population, China, in 2000 long pipeline less than 20,000 kilometers, less than 1% of global pipeline. After 2000, has made rapid development, to 2009, it has a long-distance pipelines 80,000 kilometers, accounting for 2.5% of the world total, of which 31,000 km gas pipeline, oil pipeline 29,000 km. Online service of the pipeline valve more than 2 million units.
The design and manufacture of pipeline ball valves, the emphasis on safety and reliability, is not excessive in any way. Moreover, this concept should be implemented in the whole process of ball valve product design, process specification, part processing, type test, product test, quality control and after-sales service. Whether it is a long-distance pipeline or a city pipeline network, it is a supply line of energy, and it is a national economic lifeline. Global underground oil and gas pipelines and pipeline networks, like the above-ground transmission and distribution grids, are the basis for urban industry and civilian use. Without this energy supply line, modern urban functions are immediately stopped.
1 The design of the valve body can be divided into a fully welded valve body design and a split valve body design.
The all-welded valve body is designed with a cylindrical structure and a spherical structure, and the cylindrical structure is a double welded joint. The heat input in the welding process is large, the residual stress is complex, and the axial and radial deformation are large. The spherical structure is four weld seams. Now due to the advancement of the process technology, the left and right valve body is hot forged and formed, and the single weld seam can be welded in the middle to reduce the line energy input and reduce the axial and radial deformation.
The split structure generally consists of a valve body and left and right connectors. The connecting body and the valve body are connected by bolts. The connection strength between the thickness of the connecting flange and the bolt should be analogized according to the flange corresponding to the inner diameter of the valve body. The joint strength must prevent the pipe stress from being loosened and the seal is invalid. The valve body is in face-to-face contact with the connecting body with no gap in between. The seal must meet the fire safety requirements, and the rubber O -ring and the wound metal pad combination seal. Forging of the valve body material is above the temperature of -29C ° selection ASTM A105; -29C ° or less selected ASTM A350 LF2. For the welded valve body, the chemical composition, carbon content, carbon equivalent, and elements such as sulfur and phosphorus of the A105 or LF2 materials are subject to special restrictions. Forgings are inspected according to the standard of three-level forgings, 100 % non-destructive testing, coloring inspection and ultrasonic testing at the weld.
Most of the valve body of the gas pipeline ball valve is A105 , ball A105N . Most of the valve body of the ball valve of the oil pipeline adopts A105 and ball 316 .
2The sealing seat and the sealing valve seat adopt a combined sealing structure, that is, the initial “ sealing †of metal to metal to block the entry of solid particles; soft seals such as rubber, PTFE plastic, nylon, PEEK, etc. are used as secondary seals to ensure zero leakage. . However, due to the accidental introduction of foreign matter in the pipeline to the soft seal material, the pipeline ball valve is provided with an emergency sealant injection system to obtain temporary sealing requirements.
The rubber ring for sealing has a round, triangular or other special shape. The valve company has its own design structure and process measures to prevent the rubber ring from being blown out or cut during the switching process . For Class 900 pounds or above, materials with explosion-proof pressure reduction ( AED ) characteristics should be used as the O -ring material. The sealing ring of PTFE generally adopts a cylindrical inlaid structure, and can also be made into a barbed combined structure, which is intended to ensure that the sealing ring is not blown out and the sealing fails.
The sealing seat material is the same as the valve body material, electroless nickel plating, spring loaded to ensure the initial sealing specific pressure, spring can be used coil spring, leaf spring or disc spring, the material is Inconel X - 750 .
The inlet and outlet end seats are designed with a symmetrical two-way seal. This self-sealing piston dielectric structure, in accordance with customer needs can be designed as a "simple piston effect" (Single piston action), a pressure seal seat structure and relief from "double piston effect" (Double Piston effect) double seal structure. The single piston effect is the inlet end seal, and the pressure at the outlet end chamber is automatically discharged.
Analysis of the design of pipeline ball valves
Design and manufacture of pipeline ball valves