1. The improvement plan According to the failure of the butterfly check valve, the structure of the valve disc and the connection between the valve disc and the positioning rod can be improved to eliminate the stress concentration at the connection part, reduce the probability of failure of the butterfly check valve when it is used, and prolong the service life of the check valve. The disc of the butterfly check valve and the connection between the disc and the positioning rod are improved,...
Improvement in Butterfly Check Valves Read
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1. An introduction to marine valves A marine valve is a device used to control the fluid pressure, flow and flow direction in the ship pipeline in order to meet the environmental conditions of the ship. It is currently widely used in various systems of the ship. The unique working environment of ships makes marine valves different from ordinary valves, forming an independent system. The differences between marine valves and ordinary valves are reflected in the aspects of shapes, weights and materials....
Problems in Manufacturing Marine Valves Read
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The common failures and damages of butterfly check valves in actual production are analyzed, and the original butterfly check valve structure is simulated, analyzed and verified by finite element simulation software; the structure is improved for weak parts. The valve disc is subjected to stress and deformation analysis, and a structural form with uniform force distribution and small deformation is designed, and a solution to failures is proposed. 1 Overview ...
Common Failures of Butterfly Check Valves Read
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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,...
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