LINEAR VALVE ACTUATOR SYSTEM AND METHOD FOR CONTROLLING VALVE OPERATION

摘要

The system, according to one embodiment of the present invention, comprises a stationary coil linear motor to drive a valve with a stem comprising a ferromagnetic property. The linear motor moves the valve in response to control governed by an electronic valve control computer. The valve is movable between a closed position at a selectable rate of both acceleration and speed for a selectable distance (“lift”) to a second selectable open position, including all position variations between the fully open and fully closed states. Valve position, velocity and acceleration can be varied both during a valve stroke and from one stroke to the next, as controlled by the logic programmed on a non-transitive memory of the electronic valve control computer.

主权项

1. A control method for a valve, the method comprising:
providing a stationary coil adapted to control linear movement of the valve; applying a first variable voltage and first polarity to the stationary coil to decelerate the linear movement of the valve until the valve reaches a predetermined open position less than or equal to a fully open position; and applying a second variable voltage and second polarity to the stationary coil to soft seat the valve and hold it in a closed position.