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 valve

Based on the actual use of self operated pressure regulating valve, the control valve behind the valve is the most widely used. The closing characteristics of self operated regulating valve will involve many operations behind the valve. At the same time, its closing characteristics can also guide the use form of 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. 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 adjust the pressure behind the valve by relying on the pressure of the air flow. The pressure regulating valve has 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 self-adjusting 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 transformed into power to make the system reach the state of balanced operation, 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 be increased.

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

The biggest difference between self operated pressure regulating valve and control valve is that the control valve needs external energy. Without driving energy, the control valve will not be used, so the closing process of the control valve is more complex. Since the control valve needs 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. It can be seen that the use advantages of the self operated pressure regulating valve can not only save energy consumption, but also simplify the valve closing operation. However, technicians can still close the self operated pressure regulating valve and control valve in the form of 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. The volume of the self operated pressure regulating valve is also relatively small. The closing process must first be transmitted to the executive structure through the signal setting process and the processing of the control system. 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 influence 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. If there is unstable operation, the self operated pressure regulating valve will use its own function to control the liquid level [4].

3. Specific conditions for the 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 technical innovation, but under the influence of some special media, the self operated pressure regulating valve is difficult to control the valve closing operation in time and accurately, so technicians are also required to use the self operated pressure regulating valve reasonably, so that it can give full play to its function to the greatest extent. Medium viscosity is one of the factors affecting the use. Due to the change of medium viscosity, the impulse pipe and 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 of 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, the technicians are required to clearly grasp the use requirements of the self operated pressure regulating valve before use, 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 the viscosity characteristics of the medium, 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.