The working principle and parameter selection application of self-operated pressure regulating valve
Self-operated pressure regulating valve is an automatic control valve that does not require external energy, which relies on the pressure change of the medium to be adjusted to control the opening and closing of the valve, so as to achieve pressure regulation. The valve is widely used in the automatic control system of petroleum, chemical, electric power, heating and other industries, and has the advantages of simple structure, reliable action, energy saving and environmental protection. This article will introduce the working principle, parameter selection and application of self-operated pressure regulating valve in detail.
1. The working principle of self-operated pressure regulating valve
The self-operated pressure regulating valve is mainly composed of a valve body, a valve seat, a valve disc, a spring and an adjusting screw. When the medium to be adjusted enters the valve, the medium pressure acts on the valve disc, overcoming the preload of the spring, so that the valve disc leaves the valve seat and opens the valve. As the pressure of the medium increases, the disc gradually opens, and the flow rate of the medium through it also gradually increases. Conversely, when the pressure of the medium decreases, the disc closes the valve under the action of the spring, reducing the flow of the medium. The preload of the spring can be changed by adjusting the screw, so as to adjust the valve opening, and finally achieve the purpose of controlling the pressure of the medium.
2. Parameter selection of self-operated pressure regulating valve
In the parameter selection of self-operated pressure regulating valves, the following main factors need to be considered:
1. Valve specifications
The valve size should be determined based on the size of the pipe and the required flow rate. When selecting the valve size, you should make sure that it matches the size of the pipe and avoid being too large or too small, so as not to affect the normal operation of the valve.
2. Spring range
The spring range refers to the adjustment range of the spring preload. When selecting the spring range, it should be selected according to the actual needs to ensure that the valve is working properly within the required pressure range.
3. Working pressure and temperature
Operating pressure and temperature are important parameters for the selection of self-operated pressure regulating valves. When choosing, the maximum working pressure and temperature of the medium should be considered to ensure that the valve can withstand the pressure and temperature fluctuations of the medium.
4. Media characteristics
The characteristics of the medium include the corrosiveness, viscosity, impurity content and so on. When choosing a self-operated pressure regulating valve, the characteristics of the medium should be considered, and the appropriate valve material and structure should be selected to ensure the service life and reliability of the valve.
5. Additional Features
According to the actual needs, the self-operated pressure regulating valve can choose some additional functions, such as explosion-proof, anti-corrosion, heat preservation, etc. These additional features can improve the safety and performance of the valve.
3. Application of self-operated pressure regulating valve
Self-operated pressure regulating valves are widely used in various industrial automation control systems, especially in some high-pressure, high-temperature, corrosive media occasions. Here are some typical application examples:
1. Heating system: In the heating system, the self-operated pressure regulating valve can be used to control the pressure of hot water or steam to ensure the stable operation of the heating system.
2. Petrochemical industry: In the petrochemical industry, self-operated pressure regulating valve can be used to control the pressure and flow of the medium in the pipeline to ensure the stability and safety of the production process.
3. Power industry: In the power industry, self-operated pressure regulating valves can be used to control the pressure and flow of boilers and steam turbines to ensure the efficiency and safety of the power generation process.
4. Sewage treatment: In the process of sewage treatment, the self-operated pressure regulating valve can be used to control the outlet pressure of the pump to ensure the quality and quantity of the effluent.
5. Pharmaceutical industry: In the pharmaceutical industry, self-operated pressure regulating valves can be used to control the pressure and flow of media in pipelines to ensure the production quality and safety of drugs.
In short, as an efficient and reliable automatic control valve, self-operated pressure regulating valve has been widely used in various industries. Understanding its working principle, parameter selection and application cases will help to better select and use the valve, and improve the performance and reliability of industrial automation control systems.