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

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

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 the system operation. The pressure and flow of the measured medium change with the use. The fixed value can stabilize the closing characteristics of the pressure regulating valve and make it better to regulate the pressure. The self operated pressure regulating valve can also be equipped with an independent control system, and its closing characteristics can be more reliable in regulating the opening and closing of the main valve under the monitoring of the pressure transmitter and solenoid valve. The self operated regulating valve is very convenient to use, and is very suitable for large use occasions. At the same time, the self operated regulating valve is simple in structure and easy to maintain in the later period, 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

Considering 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. At the same time, its 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 director operated self operated regulating valve according to the use of the director. The closing of the operating valve with the director is simpler.

1.2 Working principle of self operated pressure regulating valve

The working principle of self operated pressure regulating valve is to regulate the pressure behind the valve by relying on the self pressure of 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 size it senses. This automatic regulating gas transmission mode is more applicable to large gas transmission occasions. After the throttle 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 can reach a balanced operation state. The valve core and valve seat will also be set to a balanced position [2]. When the operator adjusts the pressure behind the valve, the amount of air flowing in 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. It is more practical to analyze the closing characteristics of the self operated regulating valve according to its operating principle. When it is closed, the flow area between the valve core and the valve seat will decrease and the flow resistance will increase.

1.3 Differences between closing characteristics of 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 cannot 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, and handle the control valve only when it meets the closing requirements [3]. The self operated pressure regulating valve only needs to control the valve closing time according to its own air flow, which shows the advantages of the self operated pressure regulating valve. It 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 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 drive, without external drive, and the volume of the self operated pressure regulating valve is relatively small. Its closing process must first pass the signal setting process, through the processing of the control system, and then be transmitted to the executive structure. Through the combination of the executive mechanism and the regulating mechanism, the control ability of the operating object is further enhanced. If the requirements for system shutdown are met, the closing command can be executed. This closing feature is more reliable and unified, which can effectively regulate 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 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 closing characteristics of self operated regulating valve

3.1 Applications in special media

The self operated pressure regulating valve has been applied in many fields through technical innovation. However, under the influence of some special media, it is difficult to control the valve closing operation timely and accurately. Therefore, technicians are required to use the self operated pressure regulating valve reasonably to maximize 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 director will be affected. In this case, an isolation tank can be added to the impulse pipe to prevent the medium viscosity from 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 media, 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 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.

Concluding remarks

Self operated pressure regulating valve relies on its own advantages, greatly reducing the demand for energy, protecting resources and improving work efficiency. In this paper, the closing characteristics of the self operated pressure regulating valve have been clarified through research, so in the process of practical use, technicians need to reasonably set the closing operation of the self operated pressure regulating valve according to the actual situation and the influence of external factors.