| 摘要 |
AN EMERGENCY SHUTDOWN SYSTEM (10) INCLUDES AN EMERGENCY SHUTDOWN VALVE (16), A CONTROL LINE (54,56) TO CARRY A SIGNAL DETERMINATIVE OF POSITIONING OF THE EMERGENCY SHUTDOWN VALVE, A SOLENOID ASSEMBLY (22) COUPLED TO THE CONTROL LINE (54,56) TO EFFECTUATE THE POSITIONING OF THE EMERGENCY SHUTDOWN VALVE (16), AND A JUNCTION DEVICE (58) COUPLED TO THE CONTROL LINE AND THE SOLENOID ASSEMBLY. IN SOME EMBODIMENTS, THE JUNCTION DEVICE (58) INCLUDES A SWITCH, SUCH AS A RELAY, RESPONSIVE TO THE SIGNAL TO CONTROL WHETHER THE SOLENOID ASSEMBLY (22) IS COUPLED TO THE CONTROL LINE (54, 56) AND, THEREFORE, ENERGIZED.
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