How does a control valve work? What are the functions of the control valve?

The regulating valve consists of an actuator and a valve; The actuator is generally electric or pneumatic.

According to the control signal in the automation system, the opening of the valve is automatically adjusted (mainly to change the stroke of the valve core) to achieve continuous adjustment of the process parameters such as pressure, flow, temperature and liquid level of the fluid in the pipeline.

See: "Practical Technology of Control Valve" by Lu Baiwen;

1000 Questions on Control Valves" by Ming Cidong;

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Control valves serve a variety of roles in fluid control systems, including:

V-type regulating ball valve.

1.Flow regulation: A control valve can control the flow of fluid as needed to achieve the desired value in a pipe or system. By changing the position or opening of the spool, the control valve can increase or decrease the flow of fluid to meet the requirements of the system or process.

2.Pressure Regulation: A regulating valve can be used to regulate the pressure of a fluid. By changing the opening of the spool, the regulator can control the pressure of the fluid in the pipe, ensuring that the pressure is maintained within a preset range.

V-type regulating ball valve.

3.Temperature regulation: In some specific applications, control valves can be used to regulate the temperature of the fluid. For example, in heating and air conditioning systems, control valves can control the flow of coolant or hot water to regulate the temperature in the room.

4.Fluid balancing: In complex pipeline networks or systems, control valves can be used to balance the flow of fluid in different branch pipes, ensure that the fluid is evenly distributed in each branch pipe, and maintain the balance and stability of the system.

5.Process control: Control valves play an important role in industrial process control.

They can automatically adjust the spool position based on a set control strategy and feedback signals to keep fluid parameters such as pressure, temperature, or flow within a predetermined range, enabling process control of automatic grinding.

6.Safety protection: Control valves can be used for safety protection in some cases. For example, when the pressure in the piping system exceeds a preset value, the control valve can be opened purely to release excess fluid to avoid damage to the pipe or equipment.

All in all, the function of the control valve is to control the flow, pressure and temperature of the fluid to meet the requirements of the system and ensure the balanced, stable and safe operation of the system's bending bucket.

The control valve is a common industrial control valve, and its main function is to control the flow, pressure, temperature and other variables of the fluid in the pipeline to meet the needs of industrial processes. Here are the four main functions of a control valve:

1.Flow regulation: the control valve controls the flow of the fluid, so that the flow in the pipeline meets the production needs, and the larger the opening of the sail vibrato throttle, the greater the flow rate; Conversely, the smaller the opening, the smaller the flow.

In industrial processes, flow regulation is widely used in chemical, petroleum, natural gas, water treatment and other fields. Cave file.

2.Pressure regulation: The regulating valve can control the flow rate of the medium in the pipeline by changing the cross-sectional area of the medium path, so as to adjust the pressure in the pipeline. The larger the valve opening, the greater the pressure drop in the pipeline; Conversely, the smaller the opening, the smaller the pressure drop in the pipeline.

3.Temperature regulation: The control valve can control the temperature variables of the medium in the pipeline according to the needs of the industrial process, for example, to achieve effective management of heating, cooling, heat preservation, etc.

4.Fluid control: The control valve can control the fluid in the pipeline according to the special requirements of the medium, such as sealing characteristics, fluid backflow prevention, fluid switching, etc., which can be controlled and improved.

Overall, control valves are an indispensable part of industrial control. By adjusting the variables in the pipeline fluid, the production process can be optimized, the process efficiency can be improved, the product quality can be improved, the energy can be saved, the production cost can be reduced, and the sustainable development of industrial production can be promoted.

It can change the flow, pressure, temperature, etc. of the medium.

1. Regulating function: adjusting the flow rate of pipeline fluid;

2. Cut-off effect: cut off the fluid in the pipeline and prevent it from flowing.

3. Safety function: prevent accidents that occur when the fluid pressure in the pressure container exceeds the pressure limit of the container;

4. Anti-reverse effect: promote the flow of pipeline fluid in only one direction; Scattered and blind.

5. Other functions: stabilizing the pressure of the system; decompression; Carry out venting pressure relief; It plays the role of air pollution discharge function;

To select the correct control valve, you can refer to the following scheme.

1. According to the process conditions, select the appropriate structural form and material. For example, the body material of the control valve is selected according to the characteristics of the medium.

2. According to the characteristics of the process object, select the flow characteristics of the Vton control valve.

3. According to the process operation parameters, select the appropriate Vton control valve caliber size. For example, choose the right caliber according to the flow rate.

4. According to the requirements of the process, select the required auxiliary devices.

5. Reasonable selection of executive agencies. The response speed of the actuator should be sufficient for the process.

Requirements for control stroke time: The actuator of the selected Vton control valve should be able to meet the requirements of the valve stroke and the leakage level of the process. In some cases, such as the selection of pressure regulating valves (including vent valves), the actual possible pressure difference should be considered for appropriate amplification, that is, the actuator is required to provide a large force.

Otherwise, when there is an abnormal situation in the process, the actual pressure difference between the front and back of the regulating valve is large, and there will be a danger that it cannot be closed or opened.

The positive effect of the control valve means that when the signal pressure increases, the valve has a negative rod moving downward, and the reaction is the opposite, under normal circumstances, the air opening control valve is inlet under the membrane head, and the air closing valve is inlet above the membrane head.

The selection of air opening and closing of the control valve is generally determined by production and technology. From the perspective of safety, that is, when the equipment on the site is abnormal, the valve is required to be opened or closed, the opening is the gas closing valve, and the closing is the air opening valve.

DefinitionsThe control valve, also known as the control valve, changes the fluid flow rate with the help of dynamic operation by receiving the control signal output from the control unit before the adjustment carry. A regulating valve generally consists of an actuator and a valve. If according to the power used by the actuator, the control valve can be divided into pneumatic control valve, electric control valve, hydraulic adjustment check valve, in addition, according to its function and characteristics, linear characteristics, equal percentage characteristics and parabolic characteristics.