Patent ID: 7954445

Claim:
A pressure state indicator for indicating whether or not positive pressure fluid is supplied to a fluid path, comprising: a fluid guide member in which the fluid path is formed and which has an accommodation space extending in an axial direction formed outside the fluid path; a sliding sealing member which is incorporated movably in the axial direction in the accommodation space and partitions the accommodation space into a pressure chamber communicating with the fluid path and an atmospheric pressure chamber communicating with outside; a spring member which is provided in the atmospheric pressure chamber of the fluid guide member, positions the sliding sealing member at a non-supply position when no positive pressure fluid is supplied to the fluid path, and moves the sliding sealing member to a pressure supply position when positive pressure fluid is supplied to the pressure chamber from the fluid path; a sliding sleeve incorporated into the accommodation space, moving together with the sliding sealing member, entering the accommodation space when the sliding sealing member is located at the non-supply position, and projecting from the accommodation space when the sliding sealing member is located at the pressure supply position; and a transparent member provided in the fluid guide member, and externally indicating the sliding sleeve when the sliding sleeve is located at the pressure supply position.