| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure control device capable of restraining deterioration of a controllability of a control pressure due to influence of a fluid force of fluid discharged in pressure reduction, in a pressure control device for controlling a controlling pressure which is a pressure of the fluid. SOLUTION: This pressure control device 1 has a pressure increase valve for opening and closing a first communication part 26d communicating a high pressure flow path R<SB>1</SB>and a control pressure flow path R<SB>3</SB>, and a pressure reduction valve for opening and closing a second communication part 18 communicating the control pressure flow path and a pressure reduction flow path R<SB>2</SB>. The pressure reduction valve has a shaft part 21 installed in series with a first valve element 20 of the pressure increase valve slidably supported by the second communication part and provided serially with a first valve element 20 of the pressure increase valve, a shaft part flow path 24 installed to the shaft part and communicating the control pressure flow path with the pressure reduction flow path, and drive means 27 for closing the shaft part flow path by contacting the shaft part from the pressure reduction flow path side. The drive means moves toward a high pressure flow path to close the pressure reduction valve, and open the pressure increase valve. It moves toward the pressure reduction flow path to close the pressure increase valve, and open the pressure reduction valve. When the pressure reduction valve is opened, fluid flows out of the pressure reduction flow path through the shaft part flow path from the control pressure flow path. COPYRIGHT: (C)2009,JPO&INPIT
|
