Patent ID: 11933329
Assignee: nan
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 7:
8. The pneumatic actuator according to claim 1, wherein the control valve includes a 4-port first control valve and a 4-port second control valve, wherein each 4-port control valve has a first port, a second port, a third port and a fourth port and is switchable between a first position and a second position, wherein
(a) in the first position, the first port communicates with the second port, and the third port and the fourth port are closed,
(b) in the second position, the first port and the second port are closed, and the fourth port communicates with the third port,
wherein the first port and the third port of the first control valve are connected to the second air chamber, and the second port of the first control valve is connected to the third air chamber and the fourth port of the second control valve, the fourth port of the first control valve is connected to the first air chamber and the pneumatic source, the first port and the third port of the second control valve are connected to the fourth air chamber, and the second port of the second control valve is connected to the atmosphere.