The fault of the servo valve often work in electro-hydraulic servo system debugging or not found in normal circumstances. So here is sometimes system problems such as amplifiers, feedback mechanism, actuator fault, sometimes it is problem of servo valve. So the first thing to understand is the system problem, or servo valve. The common way to solve this question is: first, conditional will unload valve, a survey on test bench can. Second, in most cases without this condition, then a simple solution is to open loop system, the standby independent dc power supply, the multimeter to servo valve for plus or minus value current, different from the output of the valve situation to determine whether there is something wrong with the valve, is what's wrong with it. problem, then find system problems, such as: the internal leakage of the actuator is too large, will cause the system action is slow, hysteresis seriously, and even can't work; Problem of feedback signal circuit or disorder and so on, the amplifier output signal distortion or not working, here an ominous talk about system, mainly talk about the failure of valve below. ( 1) does not work the reasons are: the motor coil break line, sealing off; There is the oil or oil in and out of the mouth. Another may be prestage congestion, makes the valve core is just the card dead zone in the middle position, valve core is stuck in the middle, of course, the less chance. Motor coil series or parallel against the two coils, magnetic force of two coils to form the offset. ( 2) has a fixed output, but is out of control: the prestage blocking the nozzle, valve core is loot card and body deformation caused stuck valve core, or internal protection filter was chocked up with stolen goods. To replace the filter element, returned to the factory cleaning, repair. ( 3) is slow, slow response etc. Reason: systematic oil supply pressure is reduced, protection filter partial blockage, some valve zero organization is loose, loose and motor parts, or moving coil of moving coil valve and the valve core is loose. Executive power in the system components of leakage is too large, it is a reason. In addition to the oil is too dirty, the resolution, hysteresis broadening is also one of the reasons. ( 4) System frequency high vibration and noise cause: the oil mixed with large amount of air, oil dirty; System gain adjustable high, from the power supply noise amplifier, coil of servo valve and valve housing and ground wire insulation is not good, is not pass, flutter signal is too large or the resonance phenomenon caused by the frequency relation with the system, moreover, the relatively low system and choose the high frequency of the servo valve. ( 5) output positive and negative, not continuous control, into a 'switch' control. Reason: servo feedback mechanism in the Industrial Valves failure, or system feedback disconnect, or is there some kind of positive feedback phenomenon. ( 6) Oil leak reason: installation surface machining quality is bad, can not seal. seal quality problem, the place such as plug on the valve sealing ring damage. Motor oil leakage between cover and body, may be bourdon tube rupture, internal pipeline rupture, etc. Servo valve troubleshooting, some can be ruled out, but many failure to delivered the valve manufacturer, on the laboratory bench debugging of repair, again: don't open valve, it is easy to damage the servo valve components. With servo valve more units can be installed a simple test bench is to judge the system problem or the problem of Industrial Valves, valve have what problem, can use again.
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