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Forged steel cryogenic globe valves are suitable for the management system of cryogenic liquid storage and transportation equipment, which have the characteristics of flexible opening and closing and reliable sealing. They can also be used for other management systems for low temperature and cryogenic media. Normal temperature globe valves refer to valves whose medium operating temperature are between -40 and +500 degrees. The material...
(3) The sealing surface of the wedge disc is welded by STL hard alloys. After fine finishing and grinding of the valve seat, the surface roughness Ra value is 0.4μm, and the parallelism of both sides is 0.08mm. (4) The common structure of the valve seat is shown in the Figure 5(a). The disadvantage of this structure is that the non-metallic sealing ring is prone to leakage after damage, and only the valve seat at the outlet end is sealed, that is, the wedge disc is...
Abstract: This article introduces the main performance, DBB function and working principle of the high-pressure forged steel slab gate valve, and analyzes its structural characteristics and the key points of processing technology. The slab gate valve is a sliding valve with the parallel wedge disc as the closing part. It is mainly used for oil and natural gas pipelines. It is inconvenient to manage and maintain the valve, because it is installed...
Forged steel gate valves are valves whose wedges move vertically along the center line of the fluid, and they are mainly used for cutting off the fluid in the pipeline. The opening and closing part of the forged steel gate valve is a wedge. The movement direction of the wedge is perpendicular to the direction of the fluid. The forged steel gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. There are two sealing surfaces for wedges of forged...
Forged steel valves can be specifically classified into forged steel check valves, forged steel gate valves, forged steel ball valves, forged steel globe valves, self-sealing gate valves, self-sealing globe valves, self-sealing check valves, forged steel needle valves, forged steel insulation valves, high-pressure forged steel gate valves, forged steel bellows valves, etc. Forced sealing is adopted for most of the stainless steel forged steel valves. When the stainless steel forged steel valve...
The forging materials are mainly carbon steel and alloy steel with various compositions, followed by aluminum, magnesium, copper, titanium and their alloys. The original state of the material is bar, ingot, metal powder and liquid metal. The ratio of cross-sectional area of metal before deformation to that after deformation is called forging ratio. Correct selection of forging ratio, reasonable heating temperature and holding time, reasonable initial forging temperature and final forging temperature,...
Different forging methods have different processes, among which the process of hot die forging is the longest. The general order is: blanking of forging blank; heating the forging blank; roll forging blank preparation; die forging forming; trimming; punching holes; correction; intermediate inspection, inspection of forging size and surface defects; heat treatment of forgings to eliminate forging stress and improve metal cutting performance; cleaning, mainly to remove surface scale; correction; inspection:...
The working force of forging equipment is great, such as crank press, stretch forging press and hydraulic press. Although their working conditions are relatively stable, the force generated by their working parts is great. For example, 12000t forging hydraulic press has been manufactured and used in China. It is the common 100~150t press, whose power is big enough. If the mold is installed or operated incorrectly, most of the force will not act on the workpiece, but on the mold, tool or equipment...
From the perspective of safety technology and labor protection, forging production is poccessed under the situation of scorching metal (such as forging temperature of low carcon steel between 1250-750℃). Due to a large amount of manual labour during the process, burns may occur if you are not careful. 1. The furnace and scorching steel ingot, workblank and forgings constantly emit a lot of radiant heat (while the forging process is end, there still exists relatively high temperature), which generates...
Forged valves: Forged valves are forged, which are generally used in high-grade pipelines. The diameter ratio is small, which is generally below DN50. 1. Forging: It is a processing method that uses forging machinery to exert pressure on metal blank to produce plastic deformation to obtain forgings with certain mechanical properties, shapes and sizes. 2. The forging materials are mainly carbon steel and alloy steel with various compositions, followed by aluminum, magnesium, titanium, copper and...
Different forging methods have different processes, among which the process of hot die forging is the longest. The general order is: blanking of forging billet; heating the forging blank; roll forging blank preparation; die forging forming; trimming; punching holes; correction; Intermediate inspection, inspection of forging size and surface defects; heat treatment of forgings to eliminate forging stress and improve metal cutting performance; cleaning, mainly to remove surface scale; correction;...
(1) Forging process includes: cutting materials into required sizes, heating, forging, heat treatment, cleaning and inspection. In small-scale manual forging, all these operations are carried out in a narrow place by several forgers. They are all exposed to the same harmful environment and occupational hazards; in large forging workshops, hazards vary with different jobs. Although the working conditions vary with forging forms, they have some common characteristics: moderate-intensity manual labor,...
Process design: Advanced manufacturers generally adopt computer simulation technology, computer-aided process design and virtual technology of hot working, which improves the level of process design and product manufacturing capability. Introduce and apply simulation programs such as DATAFOR, GEMARC/AUTOFORGE, DEFORM, LARSTRAN/SHAPE and THERMOCAL to realize computer design and hot working process control. Forging technology: Most hydraulic presses above 40MN are equipped with 100-400t.m main forging...
Foundry is to change shapeless molten metal into a shaped solid. A cast valve is a valve made by casting. Forging is mainly formed by extrusion at high temperature. It can refine the grains in the manufactured parts. Forged valves are forged out. Types of forging: Classified by deformation temperature: When the temperature exceeds 300-400℃ (blue brittle zone of steel) and reaches 700-800℃, the deformation resistance will decrease sharply and the deformation energy will be greatly...
A flange, also called a rim or ridge, is mainly used to connect tubular parts. Flanges are widely used in mechanical parts, such as petrochemical pipelines, metal pressure vessels, water and sewage pipelines of buildings, municipal water supply pipelines, ships, electric power and other industries. According to different raw materials used, flanges can be divided into carbon steel flanges, stainless steel flanges and alloy steel flanges; according to different manufacturing processes, flanges...
As we know, some valve bodies (such as flanged ball valves) are traditionally produced by casting, but about 30% of them are unqualified and unstable in performance during processing and pressure test, which has a great impact on the use of valves. In order to solve this problem, some manufacturers have broken through the traditional processing technique. The valve body is produced by forging, forging all parts of the forged valve integrally, forging the valve body by one-time hot die forging,...
Forging production is one of the main processing methods to provide mechanical parts workblank in mechanical manufacturing industry. By forging, not only the shape of mechanical parts can be obtained, but also the internal structure of metal can be improved, and the mechanical and physical properties of metal can be improved. Generally, forging production methods are used to manufacture important mechanical parts with high stress and high requirements. For example, important parts such as shaft,...
Modern forging industry has a history of hundreds of years in developed countries such as Europe and America. Therefore, advanced forging technology has been monopolized by Germany, America, Japan and Russia. China's forging industry started later than that of developed countries, thus many key forging products mostly depend on imports. However, with the development of social economic level and the increase of communication opportunities with foreign countries, China's forging...
At present, China's valve forging industry has poor production skills and equipment; Independent innovation ability is relatively weak; The quality level of many valve castings is not good enough. Problems like serious environmental pollution, high consumption of energy and materials, have long hampered the development of China's valve forging industry. Therefore, China is still far from the goal of becoming a strong forging country. It is understood...
Characteristics of Forged Valves: Compared with castings, forging process improves the organizational structure and mechanical properties of the metal. After the casting structure is hot processed and deformed by forging method, due to the deformation and recrystallization of the metal, the original coarse dendrite and columnar crystal grains are changed into equiaxed recrystallized structures with finer grains and uniform sizes, so that the original segregation, looseness, porosity, slag inclusion...