Development direction of energy-saving control valves with low energy consumption
Energy conservation, reducing energy consumption, and improving energy utilization efficiency are a development direction for regulating valves. There are several main development directions.
1. Use a regulating valve with a low pressure drop ratio. Reducing the proportion of the regulating valve in the entire system pressure drop, thereby reducing energy consumption, therefore, designing a regulating valve with a low pressure drop ratio is one of the development directions, and another development direction is to use a low impedance regulating valve. For example, butterfly valves, eccentric rotary valves, etc. are used.
2. Using a self operated regulating valve: For example, directly using the pressure of the medium behind the valve to form a self operated control system, using the energy of the controlled medium to achieve pressure control behind the valve.
3. A regulating valve using an electric actuator. The pneumatic actuator requires a certain amount of air pressure throughout the entire operation process of the regulating valve. Although amplifiers with low consumption can be used, over time, the air consumption is still enormous. By using an electric actuator, when changing the opening of the regulating valve, power supply is required. When the required opening is reached, the power supply can no longer be supplied. Therefore, from the perspective of energy conservation, electric actuators have obvious energy-saving advantages compared to pneumatic actuators.
4. Adopting a piezoelectric regulating valve. Piezoelectric valves are used in intelligent electrical valve positioners, which only consume air when the output signal increases.
5. Adopting a valve core with a balanced structure to reduce the thrust or torque of the actuator, shrink the diaphragm head chamber, and reduce energy requirements.
6. Using variable frequency speed regulation technology instead of regulating valves. For applications with high voltage drop ratio, if energy consumption is high, variable frequency speed regulation technology can be used, which uses frequency converters to change the speed of relevant operating equipment and reduce energy consumption.
Protecting the environment from environmental pollution has become a public hazard, and the pollution caused by regulating valves to the environment mainly includes valve noise and valve leakage. Among them, the environmental pollution caused by the noise of regulating valve is very serious.
1. Reduce the noise of the regulating valve. Develop various methods to reduce the noise of regulating valves, including the design of regulating valve flow paths, the design of regulating valve internals, the analysis of noise sources, and measures to reduce noise. Mainly designing noise reduction regulating valves and valve trim for noise reduction regulating valves; Reasonably allocate pressure drop and use external noise reduction measures, such as increasing isolation and using silencers.
2. Reduce atmospheric pollution of regulating valves. The atmospheric pollution of regulating valves refers to the "running", "emitting", "dripping", and "leakage" of regulating valves. These leaks not only cause waste of materials or products, but also cause pollution to the atmospheric environment. Sometimes, they can also cause accidents such as casualties or equipment explosions. Therefore, developing the packing structure and type of the regulating valve, as well as the sealing of the regulating valve, will be an important research topic for the regulating valve in the future.
The development of high-tech technologies such as computer science, control theory, and automation instruments has driven the development of regulating valves, such as the development of fieldbus regulating valves and intelligent valve positioners, and the implementation of digital communication in regulating valves. The development of regulating valves has also driven the development of other science and technology, such as research on anti-corrosion materials, methods for weakening and reducing noise, and research on fluid dynamics. With the development of fieldbus technology, regulating valves will also be open, intelligent, and more reliable. Together with other industrial automation instruments and computer control devices, they will make the functions of industrial production process control more complete, control accuracy higher, control effects more obvious, and play a more important role in China's modernization construction.