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Title:
METHOD FOR COTROLLING REMOTELY EMERGENCY SHUT DOWN VALVE
Document Type and Number:
Japanese Patent JPS5985199
Kind Code:
A
Abstract:

PURPOSE: To attain the remote control of an emergency shut down valve for a distributing pond with excellent economy and reliability by attaining the remote operation of the emergency shut down valve of the distributing pond based on the systematic overall judgement taking the controlled variable of other distributing ponds into account.

CONSTITUTION: Slave side devices 3a∼3n detect the state of an accident such as an earthquake and stop as required bypass valves 9a∼9n and switch the operation location mode from the slave side to a central monitor control station 1 for the bupass valves 9a∼9n, and transmit a closing request signal of the emergency shut valve to the central station 1. The central station 1 judges totally the closing condition of the emergency shut down valve from the controlled variable of each pond, transmits as required a close lock operating command of the emergency shut down valve to the slave station as required, and if said command cannot be awaited after a prescribed time, the slave station side closes the emergency shut down valve. Further, the central station 1 performs post- operation to the slave station side.


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Inventors:
TOKITOU KIYOSHI
OZAWA TOSHIO
NAKAYAMA KATSUYOSHI
Application Number:
JP1982000193961
Publication Date:
May 17, 1984
Filing Date:
November 06, 1982
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
E02B7/20; E02B9/00; E03B11/16; F16K17/36; F17D5/00; H04Q9/00; (IPC1-7): E02B7/02; E02B9/00; F16K37/00