Electric actuator
First Claim
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1. An actuator for an undersea valve with an axially movable spindle, the actuator comprising:
- an electric motor having an output arranged and adapted to be operatively coupled to an axially movable spindle of an undersea valve;
an electrical storage unit that is a primary source of power for said motor;
a communication device that communicates with an external control; and
a control unit connected to said motor, said electrical storage unit, said communication device, and to an input for receiving power from an external source that is a secondary source of power for said motor, said control unit having a programmable processor that monitors said electrical storage unit and controls operation of said motor, wherein when said electrical storage unit has insufficient electrical power said processor communicates with the external control through said communication device and delays operating said motor to cause the undersea valve to close awaiting a response from the external control.
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Abstract
An actuator system for actuating a valve in a subsea environment comprises a valve spindle that is arranged to be coupled to an electric motor. To provide for power to the motor, at least one local electrical storage unit is provided. The system also includes a control unit comprising switching means for controlling the power to the motor. The control unit includes an intelligent processor and is arranged to receive signals from external sensors measuring a number of external and internal parameters, The actuator is preferable housed in a modular cage for easy replacement.
111 Citations
5 Claims
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1. An actuator for an undersea valve with an axially movable spindle, the actuator comprising:
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an electric motor having an output arranged and adapted to be operatively coupled to an axially movable spindle of an undersea valve;
an electrical storage unit that is a primary source of power for said motor;
a communication device that communicates with an external control; and
a control unit connected to said motor, said electrical storage unit, said communication device, and to an input for receiving power from an external source that is a secondary source of power for said motor, said control unit having a programmable processor that monitors said electrical storage unit and controls operation of said motor, wherein when said electrical storage unit has insufficient electrical power said processor communicates with the external control through said communication device and delays operating said motor to cause the undersea valve to close awaiting a response from the external control. - View Dependent Claims (2)
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3. A method of controlling an actuator for an undersea valve with an axially movable spindle, the method comprising the steps of:
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operatively connecting an output from an electric motor to an axially movable spindle of an undersea valve;
connecting an electrical storage unit to the motor as a primary source of power for the motor;
providing a communication device that communicates with an external control;
operatively connecting a control unit having a programmable processor to the motor, the electrical storage unit, the communication device, and to an input for receiving power from an external source that is a secondary source of power for the motor, the control unit monitoring the electrical storage unit and controlling operation of the motor; and
when the electrical storage unit has insufficient electrical power for the valve, the processor communicating with the external control through the communication device and delaying operating the motor to cause the undersea valve to close awaiting a response from the external control. - View Dependent Claims (4, 5)
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Specification