Encounter this kind of thing, should reduce little song festival corresponding local damping valve to solve, such as change the packing, etc. When the force is greater than the diaphragm downward pressure on the Industrial Valves core, make up valve core, initiation of oscillation, especially on small signal condition, because the pre-tightening force is small, are more likely to make the valve core initiation trembling. Should be open at this time of cleaning the air reduces the pressure valve locator, and apply grease to the activities of local oil, to eliminate the friction. Regulator of safe sex, once there are inner and external unfair balance disturbances and exceeds the stiffness of the regulating valve, regulating valve and himself does not eliminate the interference with experience, you are the vibration. 2 valve core oscillation sometimes measured medium velocity increased sharply, in order to maintain the same differential pressure regulating valve and, when exceeds the rigidity of the valve, Industrial Valves safe sex becomes poor, and it moved whole regulator initiation severe vibration. Whole regulator in the line oscillations 1 valve group comprised roughly as follows: pipe or base violent oscillation, easy priming whole regulator oscillation; The outside is related to the frequency, that is, when the frequency of the external with the system already has a frequency equal or close to the forced oscillation of can + 羭 wisp of maximum, initiation of resonance. Regulating valve installation position should be far away from the vibration source, such as the necessity, should take preventive treatment method. The whole regulator oscillation, on has not yet reached the resonance condition, regulating valve can still basically with a given signal and adjustment. So that the valve vibration. At the ends of the regulating valve of the hard drive or fierce, can make the rapid flow of medium wave test initiation of reflected shock wave, reflected wave impact valve core. If the pressure drops to the liquid in the temperature reached the highest limit of steam pressure of the atmosphere, can make the liquid of vitality, and form a flash, the generated gas bubble, bubble son cracks in Marine valve form strong strong pressure and shock wave, vitality of hammer, the ordinary pressure can reach tens of mpa. Differential pressure before and after the valve opening is too small, the regulator is too big, to make at the throttle mouth velocity increases, pressure rapidly-changing decreased. Air flap the positioner output flap, or locator activities local corrosion, not flexible, should make the input and output signal error, vibration initiation by leaps and bounds. Instead, such as the regulator of friction force is too large, such as packing very much, gland and twist too tight, or gland aging, dry, is in the small signal action, signal is large at the phenomenon of movement and initiation and initiation too, will make the regulator initiation hysteresis vibration, approximate square wave oscillation curve. Is another regulator valve core oscillation, which you can see more from the stem and mobile, under these two kinds of oscillation comprised its disposal treatment method as described below. Regulator of the friction force is too small, such as regulating valve packing with too little, or gland loose, outside have subtle changes in input signal or drift, can quickly spread to the valve core, the valve core oscillation, and sending out of the interview. Not at all but this vibration is caused by opening the valve. Air hammer shock valve core, the valve core to form voids zhuang pits and make the valve core oscillation. , the authors think the regulator oscillation of ordinary is divided into two kinds of situation, a group is a regulator of oscillation, namely the whole regulator on a bed of a pipe or more shaking. To sum up, based on the practical experience author diagnosis, in the ordinary things, the influence of the medium to be measured the vibration of the valve core is the medium to be measured is always greater than the whole regulator oscillation, and treatment method of the valve core vibration comprised and prevent total than whole regulator comprised and prevention and treatment method of complex vibration. Based on this situation, to deal with the actuating oscillation of the pipeline and base of reinforcement, it also helps eliminate don't count to frequency interference. Q: the pneumatic - valve shock comprised and its disposal of answer: regulating valve is automatic control system of the brothers, plays a vital utility section exchange system safe operation, to make the control system in a best condition to run, your first issue in 1997 with the author 'pneumatic - valve failure analysis', regarding the regulator oscillation comprised its disposal as described below, hope have good effect. Because the outcome of the regulator itself unfair balance utility, make the valve core vibration often initiation. Normal Industrial Valves core oscillation comprised about as follows: regulator output signal. These two factors interact with each other, sometimes can make the vibration of the vibration intensity, the pipeline pumping, relaxation of accessories or components, and send out a man's interview, serious still can cause stem disconnect, seat, so that the system had no way to office. Owing to the given signal of the relative displacement of the valve core is not for whole regulator oscillation changes or changes little, its is that they are a group. Zero spring tension is too small, resist the interference of the experienced is small, in small things outside signal conditions, easy to make the valve core initiation oscillations. Practice and it can be seen that these two kinds of oscillation of comprised didn't also may share then qing, are mixed doping interweave together sometimes. 。 Rapid changes in the high and low, such as valve positioner acuity degree is too high at this time, the controller output slips or subtle changes, it will immediately change into locator output signal is very large. At this time to demand the regulator of stiffness, such as 20 ~ 100 kpa spring, or increase its office of safe sex, there is a benefit. The oscillation with ordinary very shrill scream.
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