Air cylinder, head cover, and rod cover

A head cover for an air cylinder that covers a head side end part of a cylinder tube, the head cover comprising:

• a port;
• a first flow path configured to communicate with the port and a cylinder chamber of the air cylinder;
• a first flow rate control valve disposed in the first flow path;
• a second flow path disposed in parallel with the first flow path;
• a second flow rate control valve disposed in the second flow path;
• a pilot check valve disposed in the second flow path, and connected in series with the second flow rate control valve;
• a pilot air flow path, one end of which communicates with the first flow path between the first flow rate control valve and the port, and with the second flow path between the second flow rate control valve and the port and another end of which is connected to a pilot port of the pilot check valve;
• and
• a third flow rate control valve disposed midway along the pilot air flow path and configured to supply and discharge pilot air to and from the pilot check valve,
• wherein, depending;
• on a pressure of the pilot air, the pilot check valve switches between a stale allowing passage of exhaust air discharged from the cylinder chamber, and a state preventing the passage of the exhaust air.

A rod cover for an air cylinder that covers a rod side end part of a cylinder tube, the rod cover comprising:

• a port;
• a first flow path configured to communicate with the port and a cylinder chamber of the air cylinder;
• a first flow rate control valve disposed in the first flow path;
• a second flow path disposed in parallel with the first flow path;
• a second flow rate control valve disposed in the second flow path;
• a pilot check valve disposed in the second flow path, and connected in series with the second flow rate adjustment part;
• a pilot air flow path, one end of which communicates with the first flow path between the first flow rate control valve and the port, and with the second flow path between the second flow rate control valve and the port, and another end of which is connected to a pilot port of the pilot check valve;
• and
• a third flow rate control valve disposed midway along the pilot air flow path and configured to supply and discharge pilot air to and from the pilot check valve,
• wherein, depending on a pressure of the pilot air, the pilot check valve switches between a state allowing passage of exhaust air discharged from the cylinder chamber, and a state preventing the passage of the exhaust air.