技術理論: 技術的…実践的…興味深い自動化産業ソリューション
DELCO では、顧客満足の重要性を理解し、すべてのクライアントの独自のニーズを満たすよう努めています。信頼できるバルブ サプライヤーとして、当社は優れた顧客サービスと高品質の製品を提供し、最適なパフォーマンスと長寿命を確保することに尽力しています。信頼できる制御空気サプライヤーとして DELCO を選択すると、要件に合わせて特別に設計されたカスタマイズされたバルブ アセンブリのメリットが得られ、効率が向上し、ダウンタイムが短縮されます。
制御弁の一般的な故障と解決策
Control valves are important components in industrial systems, and their performance directly affects the stable operation of the whole system. However, due to various reasons, control valves may have various failures. In this article, デルコバルブ introduces you to common faults of control valves and their solutions.
What is a control valve
Control valves in the field of industrial automation process control, by accepting the control signal output from the control unit, with the help of power operation to change the medium flow, pressure, temperature, liquid level and other process parameters of the final control element. Generally composed of actuators and valves, can be divided into pneumatic control valves, electric control valves, self-operated control valves.
Common faults of control valves and their solutions
External flushing method
In dealing with easy to precipitate or solid particles in the media, the throttle port of the control valve and the guide is often clogged. Effective way to solve this problem is in the lower part of the valve external flushing gas or steam. In this way, when the valve is clogged or jammed, by opening the external gas or steam valve, you can complete the flushing without operating the valve, restore the normal operation of the valve.
Installing Pipeline Filter Method
For small-diameter control valve, especially the ultra-small flow valve, its throttle gap is very small, the medium can not contain any impurities. In this case, a filter can be installed on the pipeline before the valve to ensure the smooth passage of the medium. In addition, for the regulating valve with a positioner, because the positioner air line throttle port blockage is a common failure, so it is necessary to install an air filtration and pressure reducing valve on the air source pipeline before the positioner.
Cleaning method
Newly commissioned system and the initial period after overhaul, the pipeline welding slag, rust and other impurities are often in the throttle port, guiding parts and the lower bonnet balance hole caused by clogging. In the face of this situation, the valve needs to be disassembled for cleaning to remove impurities. If the sealing surface is damaged, it is also necessary to carry out grinding treatment. At the same time, open the bottom plug flushing impurities in the lower bonnet, and flushing the pipeline.
Straight through to angle method
Straight-through control valve due to its complex flow path design, easy to cause media precipitation, which in turn causes blockage. The straight-through valve is changed to an angle valve is an effective solution. Angle valve design is more in line with fluid dynamics, better scouring performance, smaller dead zone.
Increase the throttle gap method
When solid particles in the medium or piping in the weld slag and rust can not pass through the throttle port and cause blockage, consider using throttle parts with a larger throttle gap, such as open-window or open-type spool and sleeve. These designs are easier to troubleshoot due to their concentrated throttling area rather than uniform distribution. For example, replacing the plunger-shaped spools of single- and double-seated valves with “V”-port spools or sleeve valves can be an effective solution to the clogging problem. A chemical plant’s experience shows that the double-seat valve is changed to a sleeve valve, the common stuck problem has been quickly resolved.
The media flushing method
Media flushing method is to use the medium’s own flushing ability to remove easy to precipitate or easy to block the material, thereby improving the valve’s anti-blocking function. In the implementation of this method, the key is to set the throttle port in the position of the larger scouring force, and to ensure that the throttle material has sufficient corrosion resistance to withstand scouring. This method is particularly suitable for those occasions where the medium itself has a certain kinetic energy, which can effectively remove the blockage and maintain the smooth operation of the valve.
結論
The role of the control valve in the industrial process can not be underestimated, its performance and reliability is critical to the stable operation of the entire system. In the face of common clogging and failure problems, the use of appropriate solutions can effectively maintain the normal operation of the regulating valve to ensure the efficiency and safety of the entire system.
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DELCO では、顧客満足の重要性を理解し、すべてのクライアントの独自のニーズを満たすよう努めています。信頼できるコントロール バルブ サプライヤーとして、当社は優れた顧客サービスと高品質の製品を提供し、最適なパフォーマンスと長寿命を確保することに尽力しています。信頼できるコントロール バルブ サプライヤーとして DELCO を選択すると、要件に合わせて特別に設計されたカスタマイズされたバルブ アセンブリのメリットが得られ、効率が向上し、ダウンタイムが短縮されます。
さらに、当社の電子圧力調整器は価格競争力があるため、一流のソリューションを提供できます。大手コントロールバルブメーカーの 1 つとして、当社は業界標準を満たすだけでなく、お客様のビジネス全体の収益性にも貢献する信頼性の高いバルブをお届けすることに誇りを持っています。DELCO と提携することで、会社の長期的な成功のために賢明な選択をしているという安心感を得ることができます。
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