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What is the performance grade of valve bolts?

What is the performance grade of valve bolts? There are more than 10 grades of bolts for valve connection, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9. The bolts of grade 8.8 and above are made of low carbon alloy steel or medium carbon steel and heat treated (quenched and tempered). They are generally called high strength bolts, and the rest are called ordinary bolts. There are two parts in the performance grade of bolt, which are the nominal tensile strength value and yield strength ratio of bolt material. For example: The meaning of valve bolts with […]

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Valve design and material selection: working temperature of valve

One of the key issues to be considered in valve design and material selection is the working temperature of the valve. In order to regulate the suitable working temperature of valve body materials, the suitable working temperature and relevant requirements of valve body materials used in petrochemical, chemical, fertilizer, electric power and metallurgy industries in China are clearly specified from the material properties of various types of valve steel and alloy grades, which can be used in the design, manufacture and inspection of valve products. In addition, from the aspects of technical management, production management and material procurement, the steel […]

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What are the production processes of welded pipe?

What are the production processes of welded pipe? Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or strip after curling and welding. Generally, the length is 6 meters. The production process of welded steel pipe is simple, the production efficiency is high, the varieties and specifications are more, the equipment investment is less, but the general strength is lower than seamless steel pipe. The development of steel pipe production technology began with the rise of bicycle manufacturing industry. The development of oil in the early 19th century, the manufacture of ships, boilers […]

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Analysis and treatment of low hardness of P91 elbow

Aiming at the problem of low hardness of P91 elbow of waste heat boiler in xiaoshan natural gas power generation project, based on metallographic test data such as hardness test, mechanical property test, metallographic structure analysis and chemical element analysis, combined with metallographic principle, this paper analyzes the causes of the problem and puts forward the treatment scheme. Introduction With the continuous improvement of thermal power generator parameters, a large number of SA335 P91, SA335 P92 and other materials are widely used. Due to the recent number of new units in our country, the production capacity and technical force of […]

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It doesn’t matter if the bolt is loose, it will break once it is loose. ……

Bolt loosening is common, but if you do not pay attention, it will often cause equipment vibration, damage to components, and even casualties. How to tighten a small nut has always been a prosperous topic in mechanical design. Everyone knows better, such as Japanese eccentric nuts, tang’s nuts and Chinese self-tightening nuts, but we don’t talk about the stars in these fastener circles today. Let’s talk about the most basic method of fixing nuts in our work. Why are bolts screwed more and more tightly? Under normal circumstances, we analyze bolt fracture from the following four aspects: The quality of […]

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What do Sch and Class mean in ASME?

The meaning of Sch: Sch is an abbreviation of schedule umpers for pipe size. It means that the ratio of piping system design pressure to material allowable stress at design temperature is multiplied by 100 0 and the value after rounding. For example, if the design pressure is 1MPa and the allowable pressure of the pipe is 100Mpa, the pipe with 1/100 100 0=10 and> Sch.10 should be used. For general pipes, the allowable stress of general materials is about 100Mpa, Sch.80 can bear 8MPa,Sch.160 can bear 16MPa, and so on, there is a general reference for choosing the appropriate […]

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What is AST solenoid valve

What is AST solenoid valve? In the working process of AST solenoid valve, AST solenoid valve is charged, and the solenoid valve drives the valve core down, closing the oil discharge passage X chamber of HP, and the pressure of the high-pressure oil supply pressure rises, which overcomes the pulling force of Spring 1, push the piston to move right, and cut off the discharge passage of AST critically off oil to block the oil pressure of AST critically off oil. When AST solenoid valve loses power, the spool of solenoid valve will move up under the action of the […]

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Basic knowledge of solenoid valve: principle, maintenance, selection

What is a solenoid valve? Solenoid valve is an electromagnetic control industrial equipment, in the industrial control system to adjust the direction of the medium, flow, speed and other parameters. According to the characteristics of the solenoid valve, how should the solenoid valve be selected? In order to extend the life of the solenoid valve, how to maintain it? Interpretation | Structural principle of solenoid valve (1. Valve body 2. Air inlet 3. Air outlet 4. Wire 5. Plunger) After looking at the dynamic diagram, did you find that the working principle of the solenoid valve is very simple! When […]

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What is a electromagnetic valve

What is a electromagnetic valve? Electromagnetic valve is an industrial equipment controlled by electromagnetism. It is an automatic basic component used to control fluid. It belongs to actuator, not limited to hydraulic and pneumatic. It is used to adjust the direction, flow, speed and other parameters of the medium in the industrial control system. The electromagnetic valve can cooperate with different circuits to achieve the desired control, and the control accuracy and flexibility can be guaranteed. There are many kinds of electromagnetic valves, different electromagnetic valves play a role in different positions of the control system, the most commonly used […]

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Metal fuselage processing technology: casting, forging, punching, CNC

In the past two years, metal mobile phones have become a hot spot in the industry and have been widely used in consumer electronics. This paper introduces several metal processing technologies and applications of related products in detail. For example: 1. CNC + anode: iPhone 5/6, HTC M7 2. Forging + CNC: Huawei P8,HTC M8 3. One die casting: Samsung A7 4. Stamping and hydraulic forming: HTC ONE MAX 5. Stamping + CNC: Huawei MATE 7 The following figure describes the comparison of several mobile phone shell metal processing technologies in processing cost, CNC dosage, processing cycle, yield, designability and […]

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