CPC F16K 37/0083 (2013.01) [F16K 37/0041 (2013.01); G05B 15/02 (2013.01); G06F 3/0484 (2013.01)] | 22 Claims |
1. A method for controlling safety valves comprising:
electrically coupling a control panel to a safety loop that communicatively couples a logic solver to a valve positioner for a safety valve, wherein the logic solver is configured to control the safety valve by varying a loop current on the safety loop to cause the valve positioner to adjust the safety valve to a desired position;
detecting, at the control panel, an actuation of a user interface element of the control panel that represents a trip command;
responding to the actuation by causing the control panel to manipulate the loop current on the safety loop such that the loop current enters a range;
detecting, at the valve positioner, the loop current entering the range;
responding, at the valve positioner, to detecting the loop current entering the range by initiating a trip function configured to drive the safety valve to a safe state; and
drawing, by the control panel, a level of current from the safety loop sufficient to power the control panel.
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