The existing types and quantities of control valve
s can basically meet the needs of economic development, but there is still a big gap between the reliability and service life of various valves and foreign products. In the 1980s, a large number of private and private enterprises joined the valve industry, but their current main direction is the field of general valves, and few control valves are the main products. In general, the domestically produced control valves are at the level of low technical content, short service life and average quality. There are quite a few products, especially some special performance products, there is a big gap in product organization and product quality. There are mainly high-parameter control valves, pressure reducing valves and safety valves for power stations; high-parameter control valves for petrochemical and metallurgical applications, and metal-sealed butterfly valve
s and ball valves. With the rapid development of my country's economy, my country's investment in petroleum and natural gas, petrochemical, electric power, metallurgy, steel, municipal and other fields has continued to grow. While effectively promoting the sustainable development of the national economy, it has also brought unprecedented changes to the regulating valve industry. opportunity. The development direction of the control valve is mainly intelligent, standardized and energy-saving. 1. Intelligentization: Intelligentization mainly adopts intelligent valve positioner, remote communication of operating status and other intelligent functions, which makes the management of the control valve convenient, the fault diagnosis becomes easy, and the skill requirements for maintenance personnel are reduced. The use of intelligent valve positioner can not only easily change the flow characteristics of the regulating valve, but also improve the control quality of the control system. Therefore, the requirements for the flow characteristics of the regulating valve can be simplified and standardized. The intelligent function module is used to realize the matching with the characteristics of the controlled object, which greatly reduces the types and varieties of control valve products, and simplifies the manufacturing process of the control valve. In order to reduce the variety of control valves, domestic manufacturers also produce full-function control valves. These intelligent methods will continue to improve, and will be tested and recognized in production and the market. 2. Standardization: In order to achieve interchangeability, the regulating valves produced by different manufacturers of the same size and specification can be interchanged, so that users do not have to spend a lot of time on selecting manufacturers. For interoperability, regulators from different manufacturers should be able to work with other manufacturers' products without signal or impedance mismatches. Standardized diagnostic software and auxiliary software enable control valves of different manufacturers to diagnose operating conditions and analyze operating data. The selection of regulating valve is still a very concerned issue for automatic control designers. Using a standardized calculation program and according to the data provided by the process can correctly calculate the flow coefficient of the required regulating valve, determine the piping and select the appropriate valve body, valve core and valve. Internal parts materials, etc., to standardize the design process and improve the design quality. 3. Energy saving: Reducing energy consumption and improving energy utilization rate is a development direction of regulating valve. The use of a low pressure drop ratio control valve reduces the proportion of the pressure drop in the entire system, thereby reducing energy consumption. Therefore, the design of a low pressure drop ratio control valve is one of the development directions; the other is to use a low impedance control valve, such as a butterfly valve. , eccentric rotary valve, etc. The self-operated control valve is used, for example, the pressure of the medium behind the valve is directly used to form a self-operated control system, and the energy of the controlled medium is used to realize the pressure control behind the valve. Pneumatic actuators require a certain amount of air pressure during the entire operation of the control valve. Although amplifiers with small consumption can be used, the air consumption is still huge over time. Electric actuators are used. When changing the opening degree of the regulating valve, power supply is required. When the required opening degree is reached, the power supply can no longer be supplied. Therefore, from the perspective of energy saving, electric actuators have obvious energy-saving advantages over pneumatic actuators.
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