Electropneumatic positioner

Details Electropneumatic positioner Electropneumatic positioner

1998-09-29

1999-08-03

Michalsky, Gerald A.

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

91361, 91363R, 1374875, G05B 1148

Patent

active

059311800

ABSTRACT:
An electropneumatic positioner includes a data processing control section and an electropneumatic converter. The control section includes first and second position determining sections and a signal setting section. The first position determining section obtains the valve opening degree positions of a regulating valve as the minimum and maximum valve opening degree positions which are set when a driving signal for conversion from an electrical signal into an air pressure is set to the minimum signal and the maximum signal. The second position determining section obtains the valve opening degree position of the valve which is set when the driving signal is the minimum signal on the basis of the relative positional relationship between the obtained minimum and maximum valve opening degree positions and the valve plug form of the valve. The signal setting section sets a relationship between the maximum and minimum signals of electrical signals and full opening and closing directions corresponding to valve opening degrees of the valve.

REFERENCES:
patent: 4623871 (1986-11-01), Akano
patent: 4633217 (1986-12-01), Akano
patent: 4719616 (1988-01-01), Akano
patent: 5431182 (1995-07-01), Brown
patent: 5590677 (1997-01-01), Kuroda

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