Pneumatic control valve adopts sleeve specification guide, working pressure balanced valve core, suitable for places with large pressure difference. The high-pressure gate valve is replaced by a balanced sealing ring, and the traditional double-seat valve structure with sleeve size is changed into a single-valve structure with sleeve size. This improvement greatly improves the leakage level of the sleeve size regulating valve. Metal bellows and fillers are used at the check valve for bidirectional sealing, which avoids the possibility of material exposure from the source. This type of control valve is suitable for total flow and working pressure control of harmful or valuable substances.
The pneumatic control valve is composed of a pneumatic plastic film electric actuator, a locator, and a control valve oil circuit board. There is a valve core and a high-pressure gate valve in the valve body, which has the characteristics of small leakage. The valve has a large sense of unbalance, and its allowable pressure difference is smaller than that of the double seat valve. When the pressure difference is high and the diameter is large, it is better to add a valve positioner. The valve with a nominal diameter of ≥25mm is a double-guided structure, and the air opening or air closing can be completed only by changing the connection part between the valve seat and the valve core of the pneumatic plastic film single valve regulating valve. There is a valve core and a high-pressure gate valve in the valve body of the single-valve pneumatic plastic film single-valve regulating valve, which can be opened or closed only by changing the connection between the valve seat and the valve core.
To clear the common faults of the valve positioner, it is necessary to properly distinguish the common faults of the valve positioner at which stage and which component occurs. Brief description The pneumatic actuator uses the air compression of the diaphragm vacuum pump as the driving force to push the valve or diaphragm posture. The key types are as follows: pneumatic regulating valve, vacuum solenoid valve, electronic signal pneumatic long-stroke arrangement actuator. Pneumatic regulating valve Pneumatic regulating valve consists of two parts: pneumatic actuator and regulating valve.
In the reality of the project, when one or several of the three common faults such as power off, gas loss, and data signal failure occur, the pneumatic control valve automatically opens the full valve and closes the full valve according to the safety of the processing technology. The valve or the part that maintains the valve before the common failure - three-break maintenance. Among them, closing and opening the valve can be easily accomplished by using the cylinder pressure in the oil circuit board and the axial force of the torsion spring. It is more complicated to maintain the position in the three-break maintenance. Therefore, this paper studies the plan and scheme of the position-keeping function in the three-break protection equipment used in the two engineering projects.
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Pneumatic control valve uses compressed air as the power device and the cylinder as the electric actuator, and relies on valves, converters, vacuum solenoid valves, position retention valves, gas storage cylinders, gas filters and other accessories to drive the valve to complete the switching value. Or proportional adjustment, accept the adjustment data signal of the industrial automation automatic control system to adjust the pipeline material: total flow, working pressure, ambient temperature, liquid level meter and other main parameters of the whole process of the processing technology. The characteristics of the pneumatic control valve are that it is easy to operate, respond quickly, and has a safety system that does not require additional explosion-proof countermeasures. Product structure: principle and application scope of pneumatic control valve
