Application of control valve

There are six problems in the application of control valve

① There are many kinds, specifications and parameters of control valves. In order to adapt to the control requirements of different industrial production processes, such as temperature, pressure, medium characteristics, there are nearly a thousand different specifications and different types of products, which make the selection of control valve inconvenient, installation and application inconvenient, maintenance inconvenient and management inconvenient.

② The reliability of the control valve is poor. There are great differences between the characteristics of the control valve when it leaves the factory and after a period of operation, such as the increase of leakage, the increase of noise and the deterioration of valve reproducibility, which bring difficulties to the long-term stable operation.

③ The bulky control valve brings inconvenience to the transportation, installation and maintenance of the control valve. Generally, the weight of the control valve is several to hundreds of times heavier than that of the general instrument. For example, a DN200 control valve weighs 700kg. Transportation, installation and maintenance need to use some mechanical equipment to complete, which brings inconvenience to the application of the control valve.

④ The flow characteristics of the control valve do not match the characteristics of the controlled object in the industrial process, resulting in poor quality of the control system. The ideal flow characteristic of the control valve has been determined when the product leaves the factory, but the characteristics of the controlled object in the industrial process are different, and the pressure drop ratio on the force port changes, so that the working flow characteristic of the control valve cannot match the characteristics of the controlled object, and the control quality of the control system becomes worse.

⑤ The control valve has too much noise. In industrial application, control valve noise has become the main noise source of industrial equipment. Therefore, reducing control valve noise has become an important research topic, and has been paid attention by governments all over the world.

⑥ Control valve is a kind of energy consuming equipment. At present, energy-saving technology should be adopted to reduce the energy consumption of control valve and improve the utilization rate of energy