Electro-hydrostatic circuit and aircraft

An electro-hydrostatic circuit comprising:

• a driving part;
• two supply paths;
• and
• a hydraulic supply device including a hydraulic pump configured to discharge hydraulic fluid into the two supply paths according to a rotation of an electric motor, the two supply paths being configured to supply the hydraulic fluid to the driving part and return the hydraulic fluid from the driving part so as to drive the driving part by a hydraulic pressure of the hydraulic fluid supplied from the hydraulic supply device via the two supply paths;
• a switching valve connected to the two supply paths and having a plurality of switching lines, the switching valve being configured to switch the hydraulic fluid supplied to the driving part between the plurality of switching lines;
• a pilot hydraulic line having a first end connected to each of the two supply paths between the hydraulic supply device and the switching valve, and having a second end connected to the switching valve to supply the switching valve with a pilot hydraulic pressure for switching the hydraulic fluid between the plurality of switching lines;
• a check valve disposed in the pilot hydraulic line;
• a solenoid valve disposed in the pilot hydraulic line on a downstream side of the check valve in a circulating direction of the hydraulic fluid, the solenoid valve being configured to change a supply state of the hydraulic fluid to the switching valve;
• a sealing material in the switching valve to seal the hydraulic fluid with the pilot hydraulic pressure;
• and
• a relief valve disposed in the pilot hydraulic line, the relief valve being located on an opposite side of the check valve with respect to the solenoid valve to release the pilot hydraulic pressure of the pilot hydraulic line.