Ball valve control
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsPaul A. Gilbert, Thomas V. McEwen, Terry V. Jobe
Life of this patent
Estimating the term…
Abstract
An interface between the CPU and a motor for actuating a zero displacement alve as disclosed. First and second switches each having a normally closed pole sense the closed position of the valve when the normally closed pole of the first switch is open and the open condition of the valve when the normally closed pole of the second switch is open. A motor starter completes a power circuit to the motor when energized and a logic chip having a starter input is responsive to the switch positions and a starter input of a select polarity for energizing the motor starter when the normally closed pole of one of the switches is open and the other is closed and the motor actuator state is changed to an appropriate polarity.
Claims23
An interface between a central processing unit and a motor for actuating a zero volume displacement valve for rotation in one direction between open and closed positions comprising:
- first and second double pole switch means each having a normally closed pole for sensing the closed position of the valve when the normally closed pole of the first switch is open and for sensing the open condition of the valve when the normally closed pole of the second switch is open;
- a motor starter coupled to the motor for completing a power circuit to the motor when energized;
- and
- logic means having a starter input for receiving a starter signal of a first polarity for initiating an opening of the valve and for receiving a signal of a second polarity for initiating a closure of the valve, said logic means being responsive to the switch positions and operatively coupled to the motor starter for selectively energizing the motor starter when the normally closed pole of the first and second switch means is open and the other is closed and the motor actuator input is changed to the corresponding first and second polarity.
An apparatus for opening and closing a valve comprising:
- a motor for driving the valve between open and closed position;
- adjustable cam means for sensing the valve position;
- first and second double pole switch means respectively coupled to the adjustable cam means, each having a normally close pole for sensing the closed position of the valve when the normally closed pole of the first switch is open and for sensing the open condition of the valve when the normally closed pole of the second switch is open;
- a motor starter coupled to the motor for completing a power circuit to the motor when energized;
- and
- logic means having a starter input for receiving a starter signal of a first polarity for initiating an opening of the valve and for receiving a signal of a second polarity for initiating a closure of the valve, said logic means being responsive to the switch positions and operatively coupled to the motor starter for selectively energizing the motor starter when the normally closed pole of the first and second switch means is open and the other is closed and the motor actuator input is changed to the corresponding first and second polarity.
Dependencies are inferred from the claim text.