1. Corrosion of valves is usually understood as the damage to the metal materials of valves under chemical or electrochemical environmental effects. Because the corrosion phenomenon occurs in the spontaneous interaction between the metal and the surrounding environment, how to block the metal from the surrounding environment or use more non-metallic composition materials has become a common concern of people.
2. As we all know, the corrosion damage of metal has a considerable impact on the effect period, reliability and service life of the valve. The effect of mechanical and corrosive elements on the metal greatly increases the total wear and tear of the touch surface. The total amount of wear and tear on the surface of the valve during operation. During the operation of the valve, the conflicting appearance is worn and damaged due to the simultaneous mechanical effects and the chemical or electrochemical interaction between the metal and the environment. For valves, the climatic conditions of its pipeline operation are complex; The presence of hydrogen sulfide, carbon dioxide and certain organic acids in oil, natural gas and oil layer water increases the damage to the metal surface, resulting in a rapid loss of operational capacity.
3. Because the chemical corrosion of the metal depends on the temperature, the mechanical load of the friction parts, the sulfide contained in the smooth material and its acid-resistant stability, the duration of the medium touch, the catalytic effect of the metal on the nitriding process, the conversion rate of the molecules of the corrosive corrosive substance to the metal, etc. Therefore, the anti-corrosion methods (or measures) of metal valves and the use of component valves have become one of the topics of the current valve career seminar.
4. The anti-corrosion of metal valves can be understood as coating and maintaining the condition maintenance layer (such as paint, pigment, smooth data, etc.) on the metal valves, so that the valves are not corroded in the process of manufacturing, preservation, transportation or in the process of their use.
5. The method of anti-corrosion of metal valves is determined by the required maintenance period, transportation and storage conditions, valve structure characteristics and information, of course, to adapt to the economic effect of exempting anti-corrosion.
There are four main ways to prevent corrosion of metal valves and their parts:
1. Put the volatile corrosive press agent into the atmosphere of steam (wrapped in chemical barrier paper, blow the press air through the product chamber, etc.).
2. Use the blocked water and alcohol solution.
3. Apply a thin layer of anti-corrosion (maintenance) data to the surface of the valve and its parts.
4. Apply a thin layer of film or polymer to the surface of the valve and its parts.
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Wuzhong instrument helps the smooth ventilation of the eastern line of China and Russia
On December 2, 2019, the China-Russia East Route Natural Gas Pipeline Project was officially put into operation. The large-diameter pressure regulator jointly developed and manufactured by Wu Zhong and China Petroleum Pipeline Branch was put into use at Changling Natural Gas Transmission Station in Jilin Province and successfully ventilated.
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The reason for the leakage of the sealing surface of the valve of Wuzhong instrument
1. The sealing surface is uneven and cannot constitute a sealing line:
2. The connection between the valve stem and the closure is suspended, irregular or worn;
3. The valve stem is tortuous or the assembly is not correct, so that the closure is skewed or mismatched:
Fourth, the sealing surface raw materials are not selected properly or not according to the working conditions.
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Pneumatic control valve inspection parts and daily maintenance - Wuzhong instrument
Pneumatic control valve is one of the instruments widely used in petrochemical enterprises. It is of great significance to ensure the normal operation and safe production of the process equipment by operating accurately and normally. Therefore, it is necessary to strengthen the maintenance of pneumatic control valves.
First, the key points to check the location during maintenance
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The self-operated control valve is different from that without a commander
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What valve manufacturing technologies does Wuzhong Instrument have?
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Wuzhong instrument-control valve knowledge
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Insist on the cleanliness of valves and actuators as much as possible.
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Wuzhong instrument control valve knowledge
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Structural requirements for thermocouples in Wuzhong instruments
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Wuzhong instrument A2000 axial flow valve features
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Precautions for the installation and use of electric control valve - Wuzhong instrument
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Instrument maintenance - Wuzhong instrument
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Valve positioner classification - Wuzhong instrument
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