To perform the connecting/disconnecting work at a low cost, and to improve the workability while simplifying the work by providing a fluid circuit provided with a valve and a flow circuit capable of controlling the fluid in a first block and a second block.

In a multi joint valve B as a connecting equipment, a main body is formed of a male-type first block 1 and a female-type second block 2, and a connecting/disconnecting means 3 for connecting/disconnecting the first and the second block to/from each other is provided. A circuit is closed by a first pilot check valve 5 of the first block 1 so as to prevent the generation of inner pressure, and the inner pressure eliminating work is thereby eliminated, and since plural pipelines are connected/disconnected and fixed at the same time, labor of the connecting/disconnecting work is remarkably reduced. Since a valve 4 with a manual selector device as a switch for opening and closing a circuit is used and a stopper pin 15 capable of being manually operated is used as a structural member of the connecting/disconnecting means, the first and the second blocks can be connected/disconnected by single manual operation, and the connecting/disconnecting work is facilitated.