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

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

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

1.1 classification of self operated pressure regulating valves

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 pressure regulating valve will involve many operations behind the valve, and the closing characteristics can also guide the use of the control valve. The self operated pressure regulating valve can be divided into direct acting self operated regulating valve and commander operated self operated regulating valve according to the use of the commander. The closing of the operating valve with the commander is simpler.

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 by the pressure of the air flow. The pressure regulating valve has a perfect protection function. The pressure PI in front of the valve will pass through the valve core, and the valve core will control the air flow of the valve seat according to the air flow sensed by itself. This automatic gas transmission mode is more applicable to large-scale 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 force will be converted into power, so that the system will reach the state of balanced operation. The valve core and valve seat will also be set to the equilibrium 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, so that the valve core will close to the valve seat, thus completing the closing process of the self operated pressure regulating valve. It is more practical to analyze the closing characteristics of the self operated regulating valve according to its working principle. When the valve is closed, the flow area between the valve core and the valve seat will be reduced and the flow resistance will be increased.

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 cannot be used, so the closing process of the control valve is more complicated. Since the control valve needs the indication of external control instrument signals to adjust its own use, the operator must check the control system of the control valve before closing the valve, and only when the closing requirements are met can the control valve be processed [3]. The self operated pressure regulating valve only needs to control the valve closing time according to its own air flow. Therefore, it can be seen that the self operated pressure regulating valve has the advantages of saving energy consumption and simplifying the valve closing operation. However, technicians can still close the self operated pressure regulating valve and the control valve through pressure regulation.

2. Closing characteristics of self operated pressure regulating valve

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

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

3.1 application in special media

The self-propelled 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-propelled pressure regulating valve to control the valve closing operation in a timely and accurate manner. Therefore, it is necessary for technicians to use the self-propelled pressure regulating valve reasonably so that it can give full play to its functions. The medium viscosity is one of the factors affecting the use. Due to the change of the 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 leakage gas will also affect the closing of the self-propelled pressure regulating valve. Once the gas leaks to the self-propelled pressure regulating valve, it will cause great harm, and it is difficult for the control valve to eliminate the leakage gas in time.

3.2 selection of service environment of self operated pressure regulating valve

In order to coordinate the use standard of the self-contained pressure regulating valve, so that it can be flexibly closed, it is required that before use, the technical personnel should clearly grasp the use requirements of the self-contained pressure regulating valve, strictly screen the medium, and ensure that the operating parameters of the self-contained pressure regulating valve can adapt to the newly designed process device. The control valve must accurately control the medium transmission. Under the influence of medium viscosity characteristics, the self-propelled pressure regulating valve can still be treated, so as to improve the control ability of the self-propelled 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. In this paper, the closing characteristics of the self operated pressure regulating valve have been clarified 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.