When off, the positioner output is locked, pneumatic actuators maintained at the current position. That is, without any additional accessories, positioning itself to achieve the function off signal to secure his position.
When off the power, shown in Figure 1, this protection scheme without power, so there is no break in power protection. Have no effect on whether the power pneumatic control Burner Valves position.
(2) for the use of a nozzle flapper mechanism of smart burner valve positioner:
Its power supply is connected in series with the input signal circuit burner valve, the off signal / power-up, the locator can automatically detect the abnormal pressure signal output to adjust the pneumatic control burner valve membrane compartment is locked, pneumatic adjustment Safety Valve Burner Valve position is held at fault . That is, without any additional accessories, positioning itself to achieve power, off the signal function to secure his position.
The foregoing analysis, the structure itself, the use of the seismic performance of piezoelectric smart burner valve positioner burner valve structure better. When using the nozzle flapper mechanism smart Range Top Burner Valve positioner off signals more responsive and simple structure, less attachment, the probability of occurrence of failure in the course is also relatively small.
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