Patent ID: 8602064

Claim:
A fluid passage closure system in a compressor having a housing comprising: a fluid passage formed in the housing so as to be opened to the outside of the housing and communicable with the inside of the compressor, the fluid passage includes: a large-diameter passage formed on the opening side of the fluid passage, the large-diameter passage has a peripheral wall surface; a small-diameter passage connected to the large-diameter passage; a step formed between the large-diameter passage and the small-diameter passage; and a flat portion formed in the step, a seal cap unit closing the fluid passage, the seal cap unit includes: a flat sealing surface being in contact with the flat portion, the flat portion is formed to extend in a direction perpendicular to a direction in which the seal cap unit is inserted to close the fluid passage; and a press-contact surface formed to be pressed against the peripheral wall surface of the large-diameter passage so that the seal cap unit is kept in the fluid passage; and a flow space formed between the press-contact surface of the seal cap unit and the peripheral wall surface of the large-diameter passage.