| 主权项 |
1. A valve operating device comprising:
a mounting; a first pedestal extending vertically from the mounting, wherein the first pedestal defines a first vertical pivot axis; a first arm having a first end and a second end, wherein the first arm is pivotally coupled to the first pedestal at the first end of the first arm, and wherein the first arm is configured to rotate about the first vertical pivot axis in a substantially horizontal plane that is generally perpendicular to the first pedestal; a first disc brake coupled to the first end of the first arm to selectively prevent rotation of the first arm relative to the mounting, wherein the first disc brake includes a first disc and a first pad configured to engage the first disc to prevent rotation of the first arm relative to the mounting; a second pedestal defining a second vertical pivot axis and positioned at the second end of the first arm; a second arm having a first end and a second end, wherein the second arm is pivotally coupled to the second pedestal at the first end of the second arm, and wherein the second arm is configured to rotate about the second vertical axis; a second disc brake coupled to the first end of the second arm to selectively prevent rotation of the second arm relative to the first arm, wherein the second disc brake includes a second disc and a second pad configured to engage the second disc to prevent rotation of the second arm relative to the first arm; and a valve turning machine coupled to the second end of the second arm, wherein the valve turning machine includes a motor, a handle and a control configured to operate at least one of the first disc brake and the second disc brake. |
