Products knowledge
Servo valve failure causes and to exclude---2009-10-21
Servo valve failure often electro-hydraulic servo system debugging or work under normal circumstances is not found. So here are sometimes system problems, including amplifiers, feedback mechanism, implementing agencies and other failures, and sometimes the problem is indeed servo valve. Therefore, we must first figure out a system problem, or a servo valve problems. Common way to resolve this question are: 1, conditional discharge will be valves, on the bench retest click. Second, in most cases no such conditions, when a simple approach is the system open-loop, stand-independent DC power supplies, servo valve through the meter to give a different value for the positive and negative current, the output from the valve case to determine whether the valve problems, what is wrong. Valve not a big problem, obtain other system problems, such as: within the implementing agencies lose a large, will cause the system moves slow, hysteresis, or even can not work; feedback signal circuit or disorder, etc., amplifier output signal distortion or a problem does not work, the system issues an ominous talk about here, here to talk about the main valve failure.
(1) valve does not work
The reasons are: motor coil break, Sealing-off; well into the oil or reversed out of the oil port. Another may be pre-grade plug, allowing spool just stuck in the middle of dead-zone position, spool stuck in the middle of the course, such low odds. Motor coils in series or parallel two coils reversed, and two coils exactly offset by the magnetic force.
(2) valve has a fixed output, but has lost control
reasons: pre-grade nozzle blocked, were stolen card spool and valve body deformation caused by a stuck spool, or the internal protection filters were blocked stolen goods. To replace the filter, Depot cleaning, repair.
(3) valve has been insensitive, slow response, etc.
reasons: to systematically reduce the oil pressure to protect the filter partially blocked, some valves zero body loose, and the motor separate loose parts, or moving circle of the moving coil with the control valve spool between the loose. Dynamic components in the implementation of the system lose a big, but also a cause. In addition, dirty oil, valve-resolution variation, hysteresis broadening is also one of the reasons.
(4) system, high frequency vibration and noise
reasons: excessive oil in the mix of air, oil too dirty; system gain adjustment of the excessive noise from the power amplifiers, servo valve coil and the valve casing and the ground insulation is not good, is pass the non - pass, the signal is too large or the chatter frequency relation with the system caused by resonance phenomena, Furthermore the relatively low system selected high frequency of servo valve.
(5) valve output suddenly are suddenly negative, can not be continuous control, as a "switch" control.
reasons: feedback mechanism within the servo valve failure, or system feedback disconnection, or is there some kind of positive feedback phenomenon.
(6) oil spill
reasons: the poor quality of installation of seat surface finish and sealing do not live. Quality valve port seals, valve seals, etc. on the plug is damaged. Between the motor cover and valve leakage, it may be spring tube rupture, the internal pipeline rupture.
servo valve troubleshooting, and some may exclude themselves from, but many fail to send valve manufacturing plant, into the experimental stage, rework debugging, say it again: Do not own split valve, it is very easy to damage servo valve parts The.
more units with the servo valve can be fitted with a simple test-bed their own to determine a system problem or a valve problem, valve have any questions, can be used.
(1) valve does not work
The reasons are: motor coil break, Sealing-off; well into the oil or reversed out of the oil port. Another may be pre-grade plug, allowing spool just stuck in the middle of dead-zone position, spool stuck in the middle of the course, such low odds. Motor coils in series or parallel two coils reversed, and two coils exactly offset by the magnetic force.
(2) valve has a fixed output, but has lost control
reasons: pre-grade nozzle blocked, were stolen card spool and valve body deformation caused by a stuck spool, or the internal protection filters were blocked stolen goods. To replace the filter, Depot cleaning, repair.
(3) valve has been insensitive, slow response, etc.
reasons: to systematically reduce the oil pressure to protect the filter partially blocked, some valves zero body loose, and the motor separate loose parts, or moving circle of the moving coil with the control valve spool between the loose. Dynamic components in the implementation of the system lose a big, but also a cause. In addition, dirty oil, valve-resolution variation, hysteresis broadening is also one of the reasons.
(4) system, high frequency vibration and noise
reasons: excessive oil in the mix of air, oil too dirty; system gain adjustment of the excessive noise from the power amplifiers, servo valve coil and the valve casing and the ground insulation is not good, is pass the non - pass, the signal is too large or the chatter frequency relation with the system caused by resonance phenomena, Furthermore the relatively low system selected high frequency of servo valve.
(5) valve output suddenly are suddenly negative, can not be continuous control, as a "switch" control.
reasons: feedback mechanism within the servo valve failure, or system feedback disconnection, or is there some kind of positive feedback phenomenon.
(6) oil spill
reasons: the poor quality of installation of seat surface finish and sealing do not live. Quality valve port seals, valve seals, etc. on the plug is damaged. Between the motor cover and valve leakage, it may be spring tube rupture, the internal pipeline rupture.
servo valve troubleshooting, and some may exclude themselves from, but many fail to send valve manufacturing plant, into the experimental stage, rework debugging, say it again: Do not own split valve, it is very easy to damage servo valve parts The.
more units with the servo valve can be fitted with a simple test-bed their own to determine a system problem or a valve problem, valve have any questions, can be used.
