Comprehensive Introduction to Valves

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Electric valves require a greater operating torque compared to ordinary valves. Their opening and closing speeds can be adjusted, and they feature a simple structure that makes them easy to maintain. They can be used to control the flow of various types of fluids, including air, water, steam, various corrosive substances, sludge, oils, liquid metals, and radioactive materials. On the other hand, due to the cushioning properties of the gas itself, traditional pneumatic valves are less likely to get damaged as a result of jamming during operation; however, they require a gas supply, and their control systems are more complex than those of electric valves. Valves of this type should generally be installed horizontally in pipelines. In simple terms, an electric valve is one in which an electric actuator is used to control the valve, thereby enabling its opening and closing. It can be divided into two parts: the upper part is the electric actuator, and the lower part is the valve. Electric valves should undergo simulated operation and pressure testing before installation. https://img-blog.csdnimg.cn/2020073015031678.jpg​data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== In most pipelines and devices, manual valves are preferred; however, in processes and systems that require large-scale centralized control and remote control, automatic valves are necessary. Electric valves and pneumatic valves are the two most common types of automatic valves. In small-diameter pipelines, owners generally prefer pneumatic valves, especially rotary automatic control valves such as pneumatic butterfly valves and pneumatic ball valves, as these valves are compact and lightweight, and the driving force used is compressed air, which is relatively inexpensive. Pneumatic valves are typically composed of several key components such as pneumatic actuators, solenoid valves, and limit switches; they are easy to install and have a low failure rate. Many people think that electric valves are expensive and have high operating costs, but this is not the case. When considering the overall cost, traditional valves require numerous accessories and piping installations, so they are not cheaper; in fact, they incur higher maintenance expenses. In large-diameter pipelines, electric valves are generally the preferred choice, as pneumatic valves for large diameters require larger pneumatic actuators, which not only increase costs but also result in a larger size, making installation difficult in limited space. Electric valves such as electric butterfly valves and electric ball valves have clear advantages in this regard. https://img-blog.csdnimg.cn/20200730150520824.jpg​data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== But in recent years, the application of various new technologies to electric actuators has led to a significant improvement in their performance. In particular, with the successful introduction of compact electric actuators to the market, electric valves also offer significant advantages in applications involving small-diameter pipelines and devices. Not only are their prices now competitive with those of pneumatic valves, but they are also smaller in size. The electric actuators are manufactured as integrated units, providing excellent control performance, which has made them the preferred choice for owners when it comes to automated valves. Electric valves require a greater operating torque compared to ordinary valves. Their opening and closing speeds can be adjusted, and they feature a simple structure that makes them easy to maintain. They can be used to control the flow of various types of fluids, including air, water, steam, various corrosive substances, sludge, oils, liquid metals, and radioactive materials. On the other hand, due to the cushioning properties of the gas itself, traditional pneumatic valves are less likely to get damaged as a result of jamming during operation; however, they require a gas supply, and their control systems are more complex than those of electric valves. Valves of this type should generally be installed horizontally in pipelines. https://img-blog.csdnimg.cn/20200730150700130.jpg​data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==