| CPC F15B 3/00 (2013.01) [F04B 9/1076 (2013.01); F15B 1/024 (2013.01); F15B 1/027 (2013.01); F15B 11/032 (2013.01); F15B 2211/212 (2013.01); F15B 2211/214 (2013.01); F15B 2211/6306 (2013.01); F15B 2211/6316 (2013.01); F15B 2211/6346 (2013.01); F15B 2211/6355 (2013.01)] | 7 Claims |
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1. A fluid circuit, comprising:
a fluid supply device configured to deliver a working fluid; and
pressure-increasing devices configured to increase a pressure of the working fluid,
wherein each of the pressure-increasing devices includes a cylinder connected to the fluid supply device, and a piston provided inside the cylinder and configured to be reciprocatable in an axial direction, and delivers, from the cylinder, the working fluid having the pressure which is increased due to a movement of the piston toward a pressure-increasing chamber inside the cylinder by the working fluid delivered from the fluid supply device,
the pressure-increasing devices are connected in parallel to the fluid supply device,
wherein the fluid circuit further comprises a pilot switching valve provided for each of the pressure-increasing devices, each of which uses the working fluid delivered from the fluid supply device, as a pilot fluid,
wherein each of the pilot switching valves has a port and valve positions and is configured to switch between the valve positions according to pressure acting on the port,
wherein each of the pressure-increasing devices is configured to switch stroke directions of the piston according to the valve position of each of the pilot switching valves,
and
wherein the fluid circuit further comprises a adjustable flow return valve which is configured to supply each of pressures having different pressure waves to each of the ports of the pilot switching valves such that a phase of the piston of at least one of the pressure-increasing devices is different from a phase of the piston of remaining at least one of the pressure-increasing devices.
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