VACUUM VALVE UNIT

PROBLEM TO BE SOLVED: To provide a vacuum valve unit which can prevent sewage from intruding into a control device and which is used in a vacuum sewage collecting system.SOLUTION: This vacuum valve unit includes a suction pipe 50 the distal end of which is disposed in a sewage gully 1, a vacuum valve 4 disposed between a vacuum system 5 and the suction pipe 50, a first differential pressure detection pipe 51 connected to the suction pipe 50 at a predetermined height, a second differential pressure detection pipe 52 connected to the suction pipe at a height lower than the connected position of the first differential pressure detection pipe, the mechanical control device 11 which is operated based on the pressures in the differential pressure detection pipes 51, 52 and which controls the opening and closing of the vacuum valve 4, and flexible tubes 61, 62 for connecting the differential pressure detection pipes 51, 52 and the control device 11, respectively. A first connection nozzle 51B and a second connection nozzle 52B are attached to the sides of the differential pressure detection pipes 51, 52, respectively. The connection nozzles 51B, 52B are connected to the flexible tubes 61, 62, respectively.