Abstract: An air pressure adjusting device includes a compressor configured to compress air taken in from outside, a dryer connected to the compressor and filled with a reversible dehumidifying agent, a connection port through which air dehumidified by the dryer is supplied to another device, an exhaust valve provided between the compressor and the dryer and configured to discharge air in the dryer, and a switch valve provided between the dryer and the connection port and configured to switch between a first flow path having a large air flow rate and a second flow path having a small air flow rate.

Abstract: The present invention inhibits suction of dust and moisture into a drive chamber for driving a piston of a fluid pump while reducing drive load through feeding/discharging of fluid to/from the drive chamber. In the interior of a cylinder, a pressure increasing/decreasing chamber is formed between a valve unit on the cylinder head side and the piston. On the opposite side of the pressure increasing/decreasing chamber, the drive chamber is disposed. There are provided a ventilation path for communicating the drive chamber and the outside space, a fluid path connected to the feeding/discharging space of the valve unit, a merging space where the fluid path is merged with the ventilation path midway, and a fluid filter provided in the merging space.

Abstract: A valve structure includes a partition wall, a communicating bore, a valve body and a restraining portion. The partition wall is provided in a fluid container for dividing the fluid container into a first fluid chamber and a second fluid chamber. The communicating bore is provided at the partition wall for establishing a fluid communication between the first and second fluid chambers. The valve body is provided at the partition wall for establishing and interrupting the fluid communication between the first and second fluid chambers. Further, the valve body includes an umbrella shaped valve portion being flexibly deformable for opening and closing the communicating bore. The restraining portion is provided for restraining a deforming amount of the valve portion when the valve portion is deformed in a direction to be separated from the partition wall.

Abstract: A valve structure includes a partition wall, a communicating bore, a valve body and a restraining portion. The partition wall is provided in a fluid container for dividing the fluid container into a first fluid chamber and a second fluid chamber. The communicating bore is provided at the partition wall for establishing a fluid communication between the first and second fluid chambers. The valve body is provided at the partition wall for establishing and interrupting the fluid communication between the first and second fluid chambers. Further, the valve body includes an umbrella shaped valve portion being flexibly deformable for opening and closing the communicating bore. The restraining portion is provided for restraining a deforming amount of the valve portion when the valve portion is deformed in a direction to be separated from the partition wall.