Continuous automatic adjustment valve

Ball valves, globe valves, butterfly valves, etc. can all be continuously adjusted within a certain range.

Continuous control valves basically need to realize continuous control valves within a certain angle range!

Pneumatic regulating valve controlled by DCS

I feel like what the people above said are not in-depth enough. What the 4th floor said makes sense. What kind of control system is DCS? Our company uses a Siemens CPU coupled with a control box made of modules and a touch screen. What kind of control system does it count as DCS?

The regulating valve is mainly composed of two parts: valve body and actuator. The valve bodies of regulating valves include spherical single-seat valves and cage valves, as well as butterfly valves, V-shaped ball valves, etc. The actuators are electric and pneumatic. No matter what kind of actuator, it can accept 4-20mA signal and realize automatic adjustment. The structural form of the valve body itself varies greatly from manufacturer to manufacturer, especially for valves used in special working conditions.

DCS system (DIstirbuted Control System) is a comprehensive control system that emerged with the continuous rise of modern large-scale industrial production automation and the increasingly complex process control requirements. It is the product of a combination of computer technology, system control technology, network communication technology and multimedia technology. It can provide a window-friendly human-machine interface and powerful communication functions. It is a modern equipment to complete process control and process management. 　Main technical overview of the system ※ The system mainly consists of on-site control station (I/O station), data communication system, human-machine interface unit (operator station OPS, engineer station ENS), cabinet, power supply, etc. The system has an open architecture and can provide multi-layer open data interfaces. 　　※The hardware system has high reliability, easy maintenance and advanced technology in harsh industrial sites. The underlying Chinese software platform has powerful processing functions, and provides the ability to conveniently configure complex control systems and the ability for users to independently develop dedicated advanced control algorithms. ； Easy to configure and easy to use. Supports multiple fieldbus standards to accommodate future expansion needs. 　　※The system is designed with appropriate redundant configurations and self-diagnostic functions down to the module level, making it highly reliable. Failure of any component in the system will not affect the work of the entire system. 　　※The system's parameters, alarms, self-diagnosis and other management functions are highly concentrated on display on the CRT and printing on the printer, and the control system is truly decentralized in function and physics. 　　※Overall system availability is at least 99.9% ； The system has an average time between failures of 100,000 hours, achieving complete monitoring in many fields such as nuclear power, thermal power, thermal power, petrochemicals, chemical industry, metallurgy, and building materials. 　　※“domain” concept. A large control system is divided into several relatively independent subsystems using a high-speed real-time redundant network. Each subsystem constitutes a domain. Each domain shares management and operation data, and each domain is a fully functional DCS system to better meet the needs of users. 　　※Network structure reliability, openness and advancement. At the system operation layer, redundant 100Mbps Ethernet is used ； At the control layer, redundant 100Mbps industrial Ethernet is used to ensure system reliability. ； At the field signal processing layer, the 12Mbps PROFIBUS bus connects the central control unit and each field signal processing module. 　　※Standard Client/Server structure. The operation layer of the MACS system adopts the Client/Server structure. 　　※Open and reliable operating system. The operating layer of the system adopts WINDOWS NT operating system ； The control station uses the mature embedded real-time multi-task operating system QNS to ensure the real-time, safety and reliability of the control system. 　　※Standard control configuration software. Any monitoring and control requirements can be achieved. 　　※Scalability and tailorability. Ensure economy. DCS is very commonly used nowadays. If you look for a slightly larger chemical factory, you should have it. What you mentioned should be PLC control.

If the valve wants to realize automatic adjustment, it needs a signal, which can come from a system such as a regulator or DCS.

General regulating valves can achieve continuous and automatic adjustment. Of course, this requires the cooperation of the control system. Do you want a self-operated regulating valve? This kind of regulating valve does not require external signals and control forces. It can automatically and continuously adjust the pressure and flow through its own structure.

You can achieve this by directly selecting the corresponding regulating valve. The valve core and seat structure can be selected according to process adjustment needs. As for the control system, DCS, PLC, and module control are all suitable. Frequent actions should be avoided and frequent and large-scale actions should be reduced. There are many brands, you can consult the manufacturer.

Thank you for your active participation and I have learned a lot.

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I have learned a lot here, and I hope to post more related knowledge in the future. Thank you for your hard work.