Electric valve positioner debugging method Electric valve positioner pneumatic control valve is one of the most important annex to achieve the precise positioning of the control signal to receive the valve position of the role of pneumatic control valve factory, the locator and control valve have done calibration, However, the calibration of the valve after it is installed on the pipeline often needs to be calibrated at 5 o'clock, ie, 4mA, 8mA, 12mA, 16mA and 20mA. The feedback lever of the positioner is in a horizontal position at 12mA. Valve position should be 0,25%, 75%, 100% of the trip, and the feedback lever rotation angle of less than plus or minus 45. For zero and full scale deviation can be adjusted independently of the corresponding screw to amend, under normal circumstances if The one-to-one correspondence between the valve travel and the given signal indicates that the calibration has been completed A major problem that arises when the valve is closed is how to achieve full valve seat load with the valve closed tightly. It is common practice to calibrate the valve so that the closure (eg plug, diaphragm, valve plate, etc.) is exactly positioned on the seat instead of confirming that the closure is completely against the seat. In order to maintain the design leakage, to avoid corrosion of the sealing surface, you must design the appropriate sealing load. Single-acting pneumatic actuators are usually used in the film design. With this design, the spring used can reduce the seat load and also withstand all closing pressures. A typical double-acting pneumatic actuator with piston design. With this design, unlike the membrane design, the supply pressure does not need to be limited, and in order to achieve a high closing pressure, the full load supply pressure can be applied. For piston design, the higher the pressure, the better the stability and control of the valve.
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