Regulating valve common parts of the reasons for the failure: the performance of the control valve will directly affect the quality of the entire regulatory system. As the regulating valve in the field is in direct contact with the medium to be adjusted, the working environment is very poor, so easy to produce a variety of failures. In the production process, in addition to ruled out these failures at any time, but also must be regular maintenance and regular maintenance. Especially for the use of particularly harsh environment control valve, but should pay attention to maintenance and regular maintenance. Different forms of control valve, the failure and its causes are not the same. Straight travel electric control valve, for example, explain the general failure of electric control valve causes: 1, servo amplifier: servo amplifier normal working state: (1) no input signal, there should be no output voltage. (2) Open loop dead zone current ≤160μA (Ⅱ type is 100μA). (3) When the input signal is> 240μA (type 150μA), the output load voltage is 205 ~ 220VAC. (4) The output voltage is basically symmetrical. 2, if the servo amplifier is not working properly, then the various parts may have the following situations: (1) front magnetic amplifier: ①no signal input, dual-shot magnetic amplifier output potentiometer W101 can be adjusted to zero. Can not be zero may be: A, W101 desoldering transformer or damaged. B, resistance R110, R111 and electrolytic capacitors C101, C102 Weld or desoldering. C, diodes D105 ~ D108 Weld or damaged. D, the offset current is not normal. E, AC winding asymmetry. ② There is input signal, but no output or output asymmetry may be: A, transformer B301 for the AC winding current secondary voltage asymmetry. B, the resistance of the resistors R110 and R111 has changed, the electrolytic capacitors C110, C111 damaged. C, AC excitation winding short circuit. D, diode D105 ~ D108 in some of the tube damage or Weld. (2) Trigger input, the trigger on one side of the oscilloscope screen should have a pulse signal, change the polarity of the input signal, then the other side of the trigger pulse signal. The trigger pulse number and amplitude of two groups should be basically the same. More keyword search: Regulating valve
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