| 摘要 |
A port block, which is provided with an outlet port with a first end communicating with a fluid supply passage and with a second end communicating with the outside, is movably carried on a guide rail which is provided with an opening for making communication between the outside and the fluid supply passage formed in the longitudinal direction. A seal belt, which is engaged with an opening of the guide rail, is curved downwardly at the inside of the port block by the aid of an inner port cover which is arranged at the inside of the guide rail and an outer port cover which is arranged at the outside of the guide rail.
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