How to operate the pneumatic control valve and how to maintain it?

People who have known valves probably know that there are many types of valves. Among them, the pneumatic control valve is one of the most commonly used control valves. The pneumatic control valve uses compressed gas as the power source, the cylinder as the actuator, and the Valve positioner, converter, solenoid valve, retaining valve, gas tank, gas filter and other accessories to drive the valve. The pneumatic control valve should be stored in a dry room, and both ends of the passage must be blocked. As we all know, pneumatic control valve has a wide range of applications. Pneumatic valve is one of the industrial process control instruments commonly used in petroleum, chemical, electric power, metallurgy and other industrial enterprises. But do you know how to operate the pneumatic control valve and how to maintain it? If you don't understand, you can take a look at the following introduction, I hope it can help you understand. Before understanding how to operate the pneumatic control valve and how to maintain it, let's take a look at the working principle of the pneumatic control valve. The working principle of the control valve is simply realized by compressed air. In practical application, it is of great significance to understand the working principle of the pneumatic control valve. The working principle of the pneumatic control valve: the pneumatic control valve uses compressed air as the power source, the cylinder as the actuator, and drives the valve with the help of electrical valve positioners, converters, solenoid valves, position retention valves and other accessories to realize switching or The ratio is adjustment, receiving the control signal of the industrial automation control system to complete the adjustment of the flow, pressure, temperature and other process parameters of the pipeline medium. The characteristics of the pneumatic control valve are: simple control, fast response, and intrinsic safety, no need to take additional explosion-proof measures. Pneumatic control valve types: air to open and air to close (air to close). Air-to-open type: When the air pressure on the membrane head increases, the valve moves in the direction of increasing opening. When the upper limit of input air pressure is reached, the valve is fully open. Conversely, when the air pressure is reduced, the valve moves in the closing direction, and when no air is input, the valve is completely closed. Therefore, it is also called the air-opening type as the fault-closing type. Air-closing type (air-closing type): The action direction of its air-opening type is just opposite. When the air pressure increases, the valve moves to the closing direction, and when there is no air pressure or the air pressure decreases, the valve fully opens or moves to the opening direction. Therefore, it is also called the fail-open type. The air opening or air closing of the pneumatic control valve is usually realized by the positive and negative action of the actuator and the different assembly methods of the valve structure. The selection of the pneumatic valve opening method is based on the safety perspective of process production. 1. Before the daily maintenance of the pneumatic control valve, it is necessary to wear protective equipment for labor protection, and carefully check whether the tools, utensils and instruments are qualified and reliable; To prevent short circuit, tighten the end cover and explosion-proof flexible pipe joint after operation. 2. Disassembly of Pneumatic Control Valve The disassembly of the air control valve must be done by the personnel in the production area. After the pipeline pressure is completed, it is strictly prohibited to disassemble under pressure; if the work site is in the oil and gas room, open the doors and windows, turn on the fan, and maintain indoor ventilation; when disassembling The power must be cut off first, the wires must be removed after the power inspection, the positive and negative poles of the signal lines should be marked, and the terminals should be wrapped with insulating tape; 3. Installation of pneumatic control valve The direction indicated on the air control valve should be consistent with the flow direction of the medium; add a steel gasket to tighten and seal; the explosion-proof flexible pipe must be connected and tightened. 4. Slowly open the upstream and downstream valves when the pneumatic control valve is put into operation, and observe whether there is leakage of the pneumatic control valve and its accessories; connect the wires after the pressure-resistant seal is intact, and power on after checking that there is no error; use the signal source to debug the linearity of the air control valve, and check the Conduct joint debugging with the central control, and notify the production area to enter the normal process after it is normal. 5. The maintenance of the pneumatic control valve is over When the maintenance operation is over, the tools and parts must be counted and all the sundries in the workplace must be removed. After the maintenance work is completed, remove the warning signs and make maintenance records. Through the above introduction, I believe everyone already knows how to operate the pneumatic control valve and how to maintain it. The maintenance of the pneumatic control valve is very important, and good maintenance can prolong the service life of the valve. Lianke Valve Co., Ltd. has greatly developed and improved in valve product development capabilities, valve production and processing capabilities, valve quality control capabilities, valve marketing and service capabilities, and financial and financial strength. Lianke Valve Co., Ltd. now has a complete management organization such as a valve scientific research and development center (valve technology center), a valve machining center, a valve quality inspection center, a valve market service center, and a financial settlement center. Especially in the research and development of fluorine-lined valves, the production of fluorine-lined valves, the inspection of fluorine-lined valves, and the performance of fluorine-lined valves.
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