Electrical actuation of a valve in a wellhead assembly

A system, comprising:

• a tubing hanger configured to be positioned in a wellhead assembly, the tubing hanger configured to support a tubing string, the tubing hanger comprising a bore extending at least partially through the tubing hanger;
• and
• a valve disposed along the bore of the tubing hanger, wherein the valve is configured to control the flow of a fluid medium through the bore, and wherein the valve comprises:
• an electrical actuator, wherein the electrical actuator is disposed at least partially within the tubing hanger, wherein the electrical actuator is configured to selectively open or close the valve in response to one or more electrical signals, and wherein the electrical actuator comprises:
• a spindle, wherein rotation of the spindle is configured to shift the valve between a first position and a second position, wherein in the first position, the valve is open, and wherein in the second position, the valve is closed;
• a gear assembly, wherein the gear assembly is coupled to a motor shaft and the spindle, wherein the gear assembly is configured to transfer rotation of the motor shaft to rotation of the spindle, wherein the gear assembly comprises a worm gear, wherein the worm gear is rotationally coupled to the spindle, and wherein a worm that is rotationally coupled to the motor shaft is configured to engage the worm gear such that rotation of the worm about an axis of the motor shaft causes rotation of the worm gear about an axis of the spindle.