will encounter in the thermal power steam turbine DEH debugging high-pressure regulating valve shaking problem, when encounter this situation, you need to calm analysis, we find problems from the phenomenon, from the problems check method. Here are our perspective from the design, debugging, diagnosis, treatment methods on this question, the hope can give to the power plant, debug units reference.

ultrahigh pressure Angle single commonly used needle valve seat structure, simple processing, the seat is easy to change, for single direction valve core structure. Flow valve Angle single-seat structure simple, small resistance, suitable for high pressure difference, high viscosity, containing suspended solids and granular material fluid, can avoid coking and clogging, also facilitate self cleaning and cleaning. core and valve seat is super high pressure needle valve switch control two core parts of ultra high pressure dynamic seal pair of needle Industrial Valves switch. Through conical between valve core and valve seat sealing surface contact and separation, realize the valve closed and open channels. And seal between the valve core circular sliding seal face of valve seal, seal to ensure valve chamber and the outside world. Taper sealing, the needle valve core, rely on general valve core Angle of 59 °, the seat Angle is 60 °. Experiments prove that the cone hole, selection Angle 45 ° ~ 60 °, the hole edge stress concentration coefficient is small, and the stress in the small end of the taper hole.

in case of high pressure adjustment valve jitter, we can first to see if valves instruction changing data, to carry out processing respectively.

a, valve command does not change, then the problem may appear above the servo card and servo valve. If instructions unchanged and servo valve stable output card, the problem might be astringent or oil motive and the servo valve valve connection is unsmooth. If the servo card output shaking, possible problems are: unreasonable servo card PI parameters, the valve position feedback wave ( An LVDT bad failure, an LVDT shielding problems such as cause) , servo card failure.

2, valve instructions change itself, is why we need to query will be shaking. If in order before the interconnection problems, the reason may be: speed PI parameters is not reasonable, cause over modulation; Speed channel failure, cause the abnormal fluctuations in the speed signal, the output of the speed loop. And speed channel failure may cause: magnetic resistance sensor fault, rotary speed as a protective shield, etc. And if after the interconnection in valve position command, the reason may be: power, pressure loop PI parameters is not reasonable, resulting in too; In the operation of the flow curve turning points; A frequency modulation speed fluctuation; Telecommand fluctuations, etc.

of course, the scene processing problem, according to the actual situation, item by item, after screening and comprehensive analysis, find out the real jitter. The seat Angle is large, Angle valve core hours, depend on the sealing surface, to improve the service life of the valve.

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