The exhaust steam of the 300MW feed pump steam turbine is directly connected to the main engine condenser through the exhaust steam pipeline. In order to ensure the reliable isolation of the feed pump steam turbine during the operation of the main engine, an isolation valve is set in the exhaust steam pipe. Because the exhaust pipe has a large diameter and is in a vacuum state, an electric vacuum butterfly valve is selected. The sealing of the valve must be good due to the importance of the location....
The Overhaul of Vacuum Butterfly Valves in Power Plants Read
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With the rapid development of thermal power, petrochemical, nuclear power, aerospace and other fields, the application of high-temperature and high-pressure valves has become more and more extensive, but the following problems have also appeared. (1) Long-term operation under high temperature and high pressure and alternating working conditions will cause the valve to creep, resulting in thermal fatigue and plastic deformation, which will lead to the failure of the valve's moving parts and sealing...
Problems Occurred in High-temperature and High-pressure Valves Read
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The pipe diameter of the circulating water system is quite large due to the large amount of cooling water required by thermal power plants. The nominal diameter of the main pipe of the circulating water of the 300MW unit is DN2600. The nominal diameter of the inlet and outlet valves of the circulating water of the main condenser is DN1800. Butterfly valves have become the first choice for opening, closing and regulating valves in low-pressure and large-diameter pipeline systems due to their compact...
The Overhaul of Butterfly Valves in Power Plants Read
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Since the reform and opening up, the valve industry has developed rapidly, and has made great progress in manufacturing capacity and complete sets of technologies. As an integral part of the pipeline system, the working state of the valve affects the normal operation of the system to a great extent. When the valve is used, there are many failures. Failures of valves are that the valve cannot perform its intended function due to its inability to adapt to the working conditions and its structure being...
Failures Caused by Leakages of Valves Read
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Failures caused by corrosion of valves are that valve parts lose their original functions due to the action of corrosive media, and they can be divided into failures caused by crevice corrosion and galvanic corrosion. Failures caused by crevice corrosion refer to the failure caused by corrosion in the crevice of the valve structure. Pei Wang and others observed the macroscopic characteristics of crevice corrosion on the sealing surface of the globe valve disc, and found...
Failures Caused by Corrosion of Valves Read
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Stainless Steel 316 Performance of stainless steel 316 Stainless steel 316 has excellent corrosion resistance, atmospheric corrosion resistance and high-temperature strength due to the addition of molybdenum, and can be used under harsh conditions. It also has excellent work hardening. Applications of stainless steel 316 Stainless steel 316 is applied to seawater equipment, chemical, dye, paper, oxalic acid, fertilizer and other production equipment; photography, food industry,...
Stainless Steel 316 Read
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1.1 Valves containing corrosive media According to data, the economic loss caused by replacing valves due to corrosion in a certain year in the United States was about 120 million US dollars, and the loss caused by boric acid corrosion was about 93 million US dollars. Corrosion of valves will pose a danger to the service life and safety performance of valves. Corrosion of valves mainly includes electrochemical corrosion, pitting corrosion, stress corrosion and...
Problems Occurred in Dedicated Valves Read
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What are WCB, LCB, LCC, WC6 and WC? W means casting and C carbon steel; A, B and C indicate the strength value of steel grade from low to high. WCA, WCB, WCC represent carbon steel. ABC represents the strength level, and WCB is commonly used. The pipe material corresponding to WCB is A106B, and the corresponding forging material is A105. WC6 is a casting of alloy steel. The corresponding pipe material is A355 P11, and the corresponding forging...
Materials and Standards for Valves Read
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The steam turbine drainage system is an important part of the steam turbine thermal system, especially the steam turbine body, main steam, reheat steam, high and medium pressure valves, feed pump steam turbine new steam drainage and other important drainage valves. When the heating pipe is working, the water can be drained normally in time. When the unit is in normal operation, the valve is required to be reliably isolated without leakage. If these traps leak, the impact on the efficiency...
The Overhaul of Traps in Power Plants Read
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