SAFETY VALVE SYSTEM TANK SHIP AND OPERATION METHOD FOR SAFETY VALVE SYSTEM ON SHIPS

摘要

The safety valve system 20A is provided with a main valve 21 having an introduction port 21a through which pressure from the tank is introduced and an opening port 21b through which pressure is released, A high pressure side pilot valve 22 and a low pressure side pilot valve 23 which communicate the introduction port 21a and the open port 21b to open the pressure when the operating pressure value is exceeded and a high pressure side And a switching portion 24A for switching only the low-pressure side pilot valve 23 other than the pilot valve 22 to be inoperative.