Field application of electric double seat control valve

Field application of electric double seat control valve

[double seat control valve] the electric double seat control valve adopts a double guide structure, which has the characteristics of compact structure, light weight, sensitive action, large valve capacity, accurate flow characteristics, and convenient disassembly and assembly. Electric double seat control valve is composed of double seat valve body and straight stroke electric actuator independently developed by our company. The electric actuator equipped with the electric double seat control valve contains a feeding amplifier, which receives a unified standard signal of 4-20mA or 1-5V · DC, converts the current signal into a corresponding linear displacement, and automatically controls the opening of the control valve to continuously adjust the pressure, flow, temperature, liquid level and other process parameters of the fluid in the pipeline. Electric double seat control valve is widely used to accurately control gas, liquid, steam and other media, especially for clean media with large differential pressure and no strict leakage requirements.

With the progress of science and technology, in the fields of machinery manufacturing, electric power, construction, transportation, information technology and so on, machinery and equipment or production processes have been able to achieve information processing and process control such as measurement and manipulation according to the expected goals without direct human intervention, and industrial automation has gradually been realized. The corresponding industrial automation technology has also become the main means to improve labor productivity. Among them, the regulating valve used to control the fluid flow is an important part of the industrial automation system, which is indispensable in the regulating system, and is called the "hand and foot" of the production process automation.

Stable production

As a terminal control unit in industrial process control, the stability of electric double seat control valve is particularly important to the whole control system. If the electric two seat control valve cannot stably realize the command issued by the control room, it may cause fluctuations in system pressure, temperature or liquid level, which will seriously affect normal production. In order to stabilize the normal progress of production, the elastic coefficient, the mass of moving parts, the pressure difference before and after the valve, the shape of the valve core, the damping coefficient and the viscous friction coefficient should be properly selected to make the stability range large enough to work, which has certain guiding significance in stabilizing production. With the high-load operation of some chemical plants and the implementation of 30% capacity increase, the electric double seat control valve is constantly suffering from corrosion, erosion, wear, vibration, internal leakage and other problems, which forces the service life of the electric double seat control valve to be greatly shortened and the working reliability to be reduced, leading to a sharp decline in the production efficiency of the process system and the device, and even a complete shutdown of the production in serious cases.

Optimize control.

As the terminal element in the industrial automation control system, it is essential in the regulation system. The electric two seat control valve is specially used to control the fluid pressure, flow, temperature and liquid level. In use, the type of control valve should be reasonably selected according to the requirements of the process. Pay attention to optimizing the flow characteristics of the electric double seat control valve, which should be well matched with the control system, so as to give full play to the control function of the system and generally reduce the throttling energy consumption.

In the future, when optimizing the control function of the electric double seat control valve, full attention should be paid to reducing the turbulent kinetic energy and turbulent dissipation rate. In case of vortex phenomenon with serious energy loss in the convection channel, reasonable channel optimization should be carried out. At the same time, pay attention to the following points as much as possible: reduce flow loss, optimize sleeve windows, and deal with existing cavitation and water hammer phenomena. These will further strengthen the control function of the electric two seat control valve, so as to further play a greater role in improving the production efficiency of industrial automation and reducing energy consumption.