An operation system for a piston-type expander includes: a first engaging member which is fixed to an output shaft of the piston-type expander, rotates together with the output shaft, and has a first slanting surface; a second engaging member which is rotatably disposed on the output shaft, and has a second slanting surface; and a drive device which, while keeping a rotation direction of the second engaging member around the output shaft fixed, moves the second engaging member in an axial direction of the output shaft to press the second slanting surface onto the first slanting surface, converts a pressing force of the second engaging member in the axial direction into a rotational torque of the first engaging member and the output shaft at a contact surface of the first and second slanting surfaces, and causes the first engaging member to rotate together with the output shaft.

An operation system for a piston-type expander includes: a first engaging member which is fixed to an output shaft of the piston-type expander, rotates together with the output shaft, and has a first slanting surface; a second engaging member which is rotatably disposed on the output shaft, and has a second slanting surface; and a drive device which, while keeping a rotation direction of the second engaging member around the output shaft fixed, moves the second engaging member in an axial direction of the output shaft to press the second slanting surface onto the first slanting surface, converts a pressing force of the second engaging member in the axial direction into a rotational torque of the first engaging member and the output shaft at a contact surface of the first and second slanting surfaces, and causes the first engaging member to rotate together with the output shaft.

A multi-actuation system includes a first electrohydraulic servo valve and a first actuator. A first fluid line fluidically connects the first electrohydraulic servo valve to the first actuator. The multi-actuation system also includes a second electrohydraulic servo valve and a second actuator. A second fluid line fluidically connects the second electrohydraulic servo valve to the second actuator. A ring fluidically connects the first fluid line with the second fluid line.

A multi-actuation system includes a first electrohydraulic servo valve and a first actuator. A first fluid line fluidically connects the first electrohydraulic servo valve to the first actuator. The multi-actuation system also includes a second electrohydraulic servo valve and a second actuator. A second fluid line fluidically connects the second electrohydraulic servo valve to the second actuator. A ring fluidically connects the first fluid line with the second fluid line.

A multi-actuation system includes a first electrohydraulic servo valve and a first actuator. A first fluid line fluidically connects the first electrohydraulic servo valve to the first actuator. The multi-actuation system also includes a second electrohydraulic servo valve and a second actuator. A second fluid line fluidically connects the second electrohydraulic servo valve to the second actuator. A ring fluidically connects the first fluid line with the second fluid line.

A multi-actuation system includes a first electrohydraulic servo valve and a first actuator. A first fluid line fluidically connects the first electrohydraulic servo valve to the first actuator. The multi-actuation system also includes a second electrohydraulic servo valve and a second actuator. A second fluid line fluidically connects the second electrohydraulic servo valve to the second actuator. A ring fluidically connects the first fluid line with the second fluid line.