What are the applications of the closing characteristics of the self operated regulating valve？

What are the applications of the closing characteristics of self operated pressure regulating valves?

When the self operated regulating valve is used, it does not need to add external energy. Depending on the pressure change of the measured medium, it sets a fixed value for system operation. The pressure and flow of the measured medium change with the progress of use. The fixed value can stabilize the closing characteristics of the regulating valve to better regulate the pressure. The self operated pressure regulating valve can also be equipped with an independent control system, and its closing characteristics can more reliably regulate the opening and closing of the main valve under the monitoring of the pressure transmitter and the solenoid valve. The self operated regulating valve is very convenient to use and is very suitable for large-scale applications. At the same time, the self operated regulating valve has a relatively simple structure and easy maintenance in the later stage, which increases the control ability of the pressure regulating system.

1. Classification and working principle of self operated pressure regulating valve

1.1 classification of self operated pressure regulating valve

Based on the actual use of the self operated pressure regulating valve, the control valve behind the valve is the most widely used. The closing characteristics of the self operated regulating valve will involve many operations behind the valve, and its closing characteristics can also guide the use form of the control valve. According to the use of the commander, the self operated pressure regulating valve can be divided into direct acting self operated regulating valve and commander operated self operated regulating valve. It is easier to close the operating valve with the commander.

1.2 working principle of self operated pressure regulating valve

The working principle of the self operated pressure regulating valve is to regulate the pressure behind the valve depending on the air flow pressure. The pressure regulating valve has a perfect protection function. The pressure PI in front of the valve will pass through the valve core, which will control the air flow of the valve seat according to the air flow induced by itself. This automatic gas transmission mode is more applicable to large gas transmission occasions. After the throttling treatment of the valve seat, a certain pressure will be generated. When the pressure flows through the pipeline, it will act on the membrane chamber, and the mutual forces will be transformed into power, so that the system can reach a balanced operation state, and the valve core and valve seat will also be set to the balanced position [2]. When the operator adjusts the pressure behind the valve, the inflow air volume will increase, and the force on the top plate will be greater than the capacity of the spring itself, making the valve core close to the position of the valve seat, thus completing the closing process of the self operated pressure regulating valve. According to the working principle of the self operated regulating valve, analyzing its closing characteristics can have more practical significance. When it is closed, the flow area between the valve core and the valve seat will be reduced and the flow resistance will become larger.

1.3 difference between closing characteristics of self operated pressure regulating valve and control valve

The biggest difference between the self operated pressure regulating valve and the control valve is that the control valve needs external energy. In the absence of driving energy, the control valve will not be used, so the closing process of the control valve is more complex. Since the control valve requires the indication of external control instrument signals to adjust its own use, the operator must detect the control system of the control valve before closing the valve. When the closing requirements are met, the control valve can be processed [3]. The self operated pressure regulating valve only needs to control the valve closing time according to its own air flow. This shows the advantages of the self operated pressure regulating valve, which can not only save energy consumption, but also simplify the valve closing operation. However, technicians can close the self operated pressure regulating valve and control valve through pressure regulation.

2. Closing characteristics of self operated pressure regulating valve

The self operated pressure regulating valve can operate under the condition of self driving without external driving, and the volume of the self operated pressure regulating valve is relatively small. Its closing process must first be transmitted to the executive structure through the signal setting process, through the processing of the control system, and through the combination of the Executive mechanism and the regulating mechanism, the control ability of the operating object is further increased. If the system shutdown requirements are met, the shutdown command can be executed. This shutdown feature is more reliable and unified. It can effectively adjust the flow pressure and reduce the impact of pressure difference and temperature on the liquid level. When the control system, actuator and regulating mechanism are started, the self operated pressure regulating valve will always detect the operation between the systems. In case of unstable operation, the self operated pressure regulating valve will use its own function to control the liquid level [4].

3. Specific conditions for closing characteristics of self operated regulating valve

3.1 application in special media

The self operated pressure regulating valve has been applied in many fields through technological innovation. However, under the influence of some special media, it is difficult for the self operated pressure regulating valve to control the valve closing operation timely and accurately. Therefore, technicians are also required to use the self operated pressure regulating valve reasonably to maximize its functions. Medium viscosity is one of the factors affecting the use. Due to the change of medium viscosity, the impulse pipe and the commander will be affected. In this case, an isolation tank can be added to the impulse pipe to avoid the medium viscosity affecting the closing of the self operated pressure regulating valve [5]. The inflow of leaked gas will also affect the closing of the self operated pressure regulating valve. Once the gas leaks to the self operated pressure regulating valve, it will cause great harm, and it is difficult for the control valve to eliminate the leaked gas in time.

3.2 selection of service environment for self operated pressure regulating valve

In order to coordinate the use standard of the self operated pressure regulating valve so that it can be closed flexibly, it is required that before use, technicians should clearly master the use requirements of the self operated pressure regulating valve, strictly screen the medium, and ensure that the operating parameters of the self operated pressure regulating valve can adapt to the newly designed process unit. The control valve must accurately control the medium transmission. Under the influence of medium viscosity, the self operated pressure regulating valve can still be treated, so as to improve the control ability of the self operated pressure regulating valve to external factors.

Concluding remarks

Relying on its own advantages, the self operated pressure regulating valve greatly reduces the demand for energy, not only protects resources, but also improves work efficiency. This paper has made clear the closing characteristics of the self operated pressure regulating valve through research. Therefore, in the process of practical use, technicians need to reasonably set the closing operation of the self operated pressure regulating valve in combination with the actual situation and the influence of external factors.