in the thermal power unit DEH debugging, will encounter high pressure cut-off valve jitter problem. In this case, we need to stay calm and analysis, found the problem from the phenomenon, found in the problem. Below we from the Angle of the design and debug inspection and handling of the problem, hope it will be of reference and debugging of the coal-fired power plant unit. Ultra-high pressure Angle single commonly used needle valve seat structure, simple processing, convenient replace seat, valve core for single structure. Single-seat valve Angle type structure, simple flow, small resistance. Suitable for high pressure difference, high viscosity, suspended matter and particulate fluids. Can avoid coking, jams, and facilitate the cleaning and washing. Valve core and valve seat is used to switch control of two core components of ultrahigh needle valve, constitutes a dynamic seal ultrahigh pressure needle valve switch. Through a conical sealing surface contact between the valve core and valve seat and separation, can be closed and open the channels of the valve. Between valve core and sealing ring circumferential sealing surface formed of sliding valve seal, seal to ensure valve chamber and the outside world. For the needle valve core, taper sealing. The cone Angle valve core, as a general rule, be 59 degrees, the seat of the cone Angle of 60 degrees. Experiments show that when the Angle between 45 to 60, smaller hole edge stress concentration coefficient, cone Kong Xiaoduan stress. The seat Angle is large, the core cone Angle is small, on the sealing surface, to improve the service life of the valve. Under the condition of the high pressure valve jitter, we can first check valve order data whether have change, for individual treatment. First of all, valve instruction has not changed, then the problem may appear in servo card and servo valves. If valve instruction has not changed, the output stability of the servo card, servo valve is the problem might be stuck or oil motor valve sticking. If the servo card output and possible problems are: the PI parameters of the servo card is unreasonable, valve position feedback fluctuations ( Caused by an LVDT fault, poorly screened an LVDT) And the servo card failure. Second, if the valve instruction itself changes, we need to ask the reason of instruction jitter. If instructions wobbles in front of the grid, may be due to the speed PI parameters is not reasonable, lead to overshoot; Speed channel failure, lead to abnormal fluctuation of speed signal, cause the speed loop output fluctuations. Speed channel failure possible reasons are: magnetic resistance sensor failure, poorly screened speed, etc. If grid valve position after instruction fluctuations, the reason may be: power, pressure loop PI parameters is not reasonable, cause overshoot amount; Flow curve inflection point; the operation of the A frequency modulation speed fluctuation; Remote control. Instructions, etc.

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