PRESSURE VESSEL INDICATOR

PROBLEM TO BE SOLVED: To provide a pressure vessel indicator capable of positively indicating dropping of a gas pressure in a pressure vessel by a small space. SOLUTION: The pressure vessel indicator is provided with a case 11 attached to a gas filling passage of the pressure vessel, a valve element 13 energized toward a pressure vessel side of the case 11 and moving in the case 11 toward a balance position with the gas pressure in the pressure vessel, an O-ring 12 being a seal member maintaining airtightness between the valve element 13 and the case 11, and an indication member 18 sliding with respect to the case 11 between a position protruding to a case outer part and a position not protruding. On the valve element 13, the O-ring 12 is arranged at a portion abutting on the case 11 and maintaining airtightness in a first balance position when the gas pressure in the pressure vessel is 7 MPa or more, but at a portion not abutting on the case 11 and not maintaining airtightness in a second balance position when the gas pressure is no more than 7 MPa. COPYRIGHT: (C)2009,JPO&INPIT