| 摘要 |
PURPOSE:To enable the test for a trip solenoid valve and an emergency shut- down valve even in case of performing the operation under loaded condition by a method wherein a test solenoid valve device is added to the trip system. CONSTITUTION:In order to perform the test of a trip solenoid valve 1 during the operation of system, at first a test solenoid valve 2 is operated to close a port C1, then ports C3 and C2 are communicated to each other, resulting in causing hydraulic pressures P2 and P3 to be equalized. Under this condition, a pressure switch PS1 is operated to light a display light WL1. Then, when the trip solenoid valve 1 is operated, the hydraulic pressure P2 is communicated with drain line and decreased in its value. This decreased value is sensed by a pressure switch PS2 to cause a display lamp WL2 to be lit. Thereby, it is confirmed that the trip solenoid valve 1 is operated. When an emergency shut-down valve 3 is operated in place of the trip solenoid valve 1, a test of the emergency shut- down valve 3 can similarly be performed. |
