Servo valve failure in the electro-hydraulic servo system is often not debugging or found in normal circumstances. So here is the system sometimes including amplifiers, feedback from agencies, implementing agencies, such as fault, sometimes it is the issue of servo valve. Therefore, we must first understand the system, or servo-valve problem. Commonly used to solve this question is: First, the conditional discharge valve, the test retest click. Second, in most cases no such conditions, when a simple approach is to open-loop system, spare independent DC power supply, the servo valve multimeter give money for different positive and negative current, the output from the valve case to determine whether the valve problems, what is wrong. Valve problem is to find system problems, such as: the implementation of institutions within the pass, and can cause system slow motion, hysteresis serious, or even unable to work; feedback signal circuit or disorders, etc., the problem amplifier output signal distortion or does not work, system ominous talk about here, the following breakdown of the main valve to talk about.
(1) valve does not work
The reasons are: motor coil disconnected; have access to oil or oil into the mouth anti-access. There may be pre-grade plug, the valve core is stuck in the middle of dead-zone position, spool stuck in the middle of course, this low probability. Coil motor coil in series or two then the anti-parallel, and the two coils form a magnetic force is offset.
(2) The valve has a fixed output, but has been out of control
Reasons: pre-class blocked nozzle, spool card was stolen goods and body deformation caused by a stuck spool, or internal protection of the filter was blocked stolen goods. To replace the filter,往厂cleaning, repair.
(3) valve slow response, slow response, etc.
Reasons: there is pressure to reduce oil supply system, the protection of the local filter to plug, some zero valve body loose, and loose motor parts, or dynamic valve control spool with the dynamic between the loose. Implementation of power system components within the pass, and it is one of the reasons why. The dirty oil, valves resolution variation, hysteresis is also one of the reasons widened.
(4) a higher frequency of system vibration and noise
Reasons: the air mixed with oil in heavy, dirty oil off; System Gain of high regard from the power amplifier noise, servo valve coil and the valve casing and a bad ground wire insulation is a non-Qualcomm Qualcomm, Flutter signal system is too large or the resonant frequency caused by the phenomenon of the system relatively low again and chose the high frequency of servo valve.
(5) then the output valve is then negative, not for control, as a "switch" control.
Reasons: feedback from agencies within the servo valve failure, or system feedback disconnected, or is there some kind of positive feedback phenomenon.
(6) oil
Reasons: the installation of Block, the poor quality of surface processing, not sealed. I ring the quality of valves, valve seals, etc. on the damaged plug. Motor oil between the cover and body, it may be spring tube rupture, the internal pipeline rupture.
Servo valve troubleshooting, and some may be excluded from their own, but many failures to valve to the production plant, on the experimental platform debugging rework, and then stressed again: Do not own valve removed, it is easily damaged parts of the servo valve.
More use of servo-valve units can be installed himself a simple test-bed to determine the system or the problem of valve, valve problems, can be used.
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