Pneumatic control valve with compressed air as power source, the cylinder as actuator, and drive the valve, valve positioner, converters, etc accessories of switch quantity or proportion adjustment, the industrial automation control signal to the control system can regulate the flow of pipeline medium, pressure, temperature and other process parameters.
At present, the pneumatic control valve in the petrochemical, electric power, metallurgy and other process industries widely used in the control system is indispensable important segment.
Therefore, to guarantee the pneumatic control valve is stable and reliable work is very important.
When the pneumatic - valve malfunction, can according to the regulator common faults of illness, followed the instrument and meter plant to see how to find out the cause of the problem in time.
1, air breakdown field air not open;
Air water, ice cold weather;
Purification wind stopped serving;
Air duct leakage or line blocking leads to low air pressure, wind valve can not fully open or close, not even actions;
Air filtration pressure reducer used for a long time, too much dirt and black knob to open the air leakage under pressure reducing valve, make the output of wind pressure is less than the prescribed pressure, cause the regulator to cannot fully open close, not even actions;
Field wind line of air leakage, loose connection, causing shortages of wind pressure regulator cannot fully open close, not even actions;
Filtering pressure reducing valve fault, causing the air pressure instability, caused the regulator oscillations.
2, line fault power terminal is loose, fall off, short circuit, open circuit, circuit board dust too much lead to poor contact, fluctuations, regulator produces vibration;
After the heavy rain or typhoon, the equipment of water be affected with damp be affected with damp make wiring short circuit, causing the regulator can not fully open or close;
Polarity should cause the regulator to reverse in the next action;
The power cord middle period of the fault, due to the failure of the insulation tape, wire insulation skin fall off cause short circuit between line and line, due to the vibration wire fracture, cause the regulator to discontinuous oscillation, cannot be fully open or close or even not action;
Because after regulating valve repair wiring mistakes, cause the regulator to fault;
The regulator output signal is not stable, cause the regulator to operation.
3, the locator fault feedback pole fixed nut loose fall off, fall off, the spring on the feedback pole of feedback stem, become loose, fall off, jamming regulator oscillation;
The position
sensor fault locator, when vibration is controlled to bad points will lead to the display distance, a little back to normal again, by changing can be solved.
The locator PID parameter setting is not appropriate;
4, failure or wear the seat regulator valve core (the valve body
Medium scour the scratch, rust, slag and other dirt wear)
, unsmooth (
Medium of various impurities clogging)
, untight seal (
Sealing ring wear)
, lead to valve seated when the medium is still too much, can't control;
Regulating valve packing too tight or too loose, too tight to make the regulator valve stem slow or jump, too loose can make medium leakage, if heavy oil is likely to be burning, cause a lot of accidents;
When regulator is installed different pipe and valve body, heart, make the regulator by additional stress is too large, causing oscillation, cannot be fully open or close, etc. ;
Valve stem and loose fitting fixed nut, valve stem and valve core different heart, lead to valve closed tightly by stress increases, lead to stem high-frequency oscillation, and even rupture;
Regulating valve film head fault, due to the long time use, aging metamorphism, elastic decrescent, sealing, diaphragm leakage, compression spring aging, decrease of elasticity, the fracture, cause the regulator to can't fully open close even lose control regulator valve core, valve core and valve seat's death, bend or break the stem will cause the regulator to normal, but no adjustment.
Source: the original instrument control engineering web editor: Katie instrument equipment factory
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