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What is a pressure relief valve?

What is a pressure relief valve? The pressure reducing valve is a valve that can reduce the inlet pressure to a certain required outlet pressure through regulation and make the outlet pressure automatically maintain stable by relying on the energy of the medium itself. From the point of view of hydrodynamics, the pressure reducing valve is a throttling element whose local resistance can be changed. That is to say, by changing the throttling area, the velocity and kinetic energy of the fluid can be changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, […]

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Study on the characteristics of high temperature steam oxidation layer of T91 ……

In order to realize the energy saving and consumption reduction of thermal power units, the unit parameters continue to improve [1,2,3], the superheater and reheater should operate in the water steam environment with higher temperature and pressure, and the subsequent oxidation problems become more and more prominent [4,5,6,7,8]. In recent years, the economic and safety accidents caused by the rapid growth of oxide layer and a large number of peeling have become more and more serious [9, 10, 11]. Its harm involves the following four aspects: (1) The formation of oxide layer causes the decrease of effective wall thickness of […]

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Process comparison of annealing and pickling line for cold rolled stainless st……

After the cold rolling treatment, the hardness and strength of stainless steel sheet are significantly improved, forming performance is insufficient, and it is difficult to be put into the market, so a series of follow-up treatment should be carried out. Among them, the cold-rolled stainless steel annealing and pickling line is to carry out processing annealing for cold-rolled sheet, remove the strip stress, remove the oxide scale formed during processing annealing, and finally carry out finishing and straightening treatment to improve the surface quality of the strip and obtain satisfactory products. Therefore, it is of great practical significance to study […]

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The present situation of gas valve in China and the selection of common gas va……

With the strengthening of China’s environmental awareness and the change of energy structure, China’s urban gas industry has made great progress. The types of gas have developed from simple coal system to multiple gas sources. In the late 1990s, the continuous development, construction and utilization of China’s natural gas resources have promoted the development of China’s urban natural gas into a new era. Contents: Current situation of gas valves in China Requirements for valves installed on underground pipe network Selection of valve body material of gas valve Brief introduction of several gas valves currently used in China’s gas industry Introduction […]

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How to choose the right valve according to the medium flow meter?

How to choose the right valve according to the medium flow meter? As we all know, the flow and velocity of valve depend mainly on the diameter of valve, and also on the resistance of the structure to the medium, and at the same time, it has certain internal relations with the pressure, temperature and concentration of the medium. Contents: Valve nominal diameter to inch Valve diameter (DN) and pipe diameter kilograms and pounds in valves Valve pressure rating Pressure bearing directions and installation directions of valves Selection principles of valves The flow area of valve is directly related to […]

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What’s the difference between high strength bolt and common bolt?

High strength bolt is the most common construction content in steel structure construction. All steel structure engineers will feel that they are too familiar with it. However, this may not be the case. Today, we start with the most basic concepts and take you to re understand the high-strength bolt, which may overturn your most basic understanding. Contents: What is high strength bolt Specification of high strength bolt Bolt axis tension axial deformation curve Comparison between high strength bolt and common bolt Bolt tightening method Conclusion 01. What is high strength bolt High strength friction grip bolt (HSFG for short). […]

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Development of duplex stainless steel in China

Based on the development history of duplex stainless steel in the world, the development of duplex stainless steel in research, production, application and standards in China in recent years is described. The investigation shows that in recent years, the output of duplex stainless steel in China has increased considerably, and its steel composition has gradually evolved into a structure with 2205 (SAF 2205, also known as Sandvik SAF 2205, is a Sandvik-owned trademark for a 22Cr duplex (ferritic-austenitic) stainless steel.) as the main component and multi-steel series as the cooperative development. Especially after 2019, the economical duplex stainless steel and […]

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Failure Analysis of Surface Stellite Alloy Overlayer on Disc of Wedge Gate Val……

Stellite alloy, commonly known as cobalt-based alloy, is a kind of cemented carbide with Co, Cr and W as the main elements. It can be sprayed on the surface of vulnerable parts by various welding processes, and can also be made into castings [1_4]. Due to its characteristics of wear resistance, corrosion resistance, oxidation resistance and high temperature resistance, it is widely used in various hard coatings or contact sealing surfaces [5 7]. Visual inspection in a nuclear power plant found that the surfacing layer of Stellite alloy on the sealing surface of both sides of a wedge gate valve […]

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Research Progress of Nickel-based Corrosion Resistant Alloys

Nickel-based alloys not only have unique corrosion resistance and even high temperature corrosion resistance in many industrial corrosive environments, but also have high strength, good plasticity and toughness. They can be smelted, cast, cold and hot deformation, processing and welding, and are widely used in petrochemical, energy, marine, aerospace and other fields. 1. Composition and Classification Nickel is completely stable in alkali solution and has excellent corrosion resistance to active gases (such as fluorine, chlorine, bromine and their hydrides), hydroxides (such as NaOH, KOH) and some organic compounds. The main role of alloying elements in resisting corrosion in aqueous solution […]

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Corrosion Behavior of 316LN Welded Joints in High Temperature and High Pressur……

The primary circuit main pipeline, known as the “aorta” of nuclear power plants, is one of the seven key equipment in the nuclear island. It connects the reactor pressure vessel, steam generator and reactor coolant pump to form a closed loop. The main pipe consists of two loops, and there are 12 welded joints [1,2]. In the operation environment of nuclear power plant, these stainless steel welded joints will inevitably be corroded by high temperature and high pressure boron water in the primary circuit of nuclear power plant. The stability of the welded joints is related to the safety of […]

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