초록 ▼

A valve actuator is provided for use in conjunction with a valve having an actuating member movable between a first position in which the valve is closed and a second position in which the valve is open. The valve actuator comprises a reversible motor having its output mechanically connected to the

A valve actuator is provided for use in conjunction with a valve having an actuating member movable between a first position in which the valve is closed and a second position in which the valve is open. The valve actuator comprises a reversible motor having its output mechanically connected to the actuating member. The actuation of the motor is controlled by a circuit having a microprocessor. An optical sensor on the valve actuating member provides an input signal to the microprocessor indicative of the position of the valve and the position of the valve corresponding to both the open and closed position are stored in a memory accessible to the microprocessor. When the actuating member attains a desired position, the microprocessor is programmed to generate a stop signal which deactivates the motor. Strain gages connected to either the actuating member or the motor output shaft generate an output signal to deactivate the motor when the torque exceeds a predetermined amount while an override circuit permits an increased torque to be applied to the actuating member following the initial activation of the motor in order to break the valve free.

대표청구항 ▼

For use in conjunction with a valve having an actuating member movable between a first position in which said valve is closed and a second position in which said valve is open, a valve actuator comprising: reversible motor means having an output mechanically connected to the actuating member, means

For use in conjunction with a valve having an actuating member movable between a first position in which said valve is closed and a second position in which said valve is open, a valve actuator comprising: reversible motor means having an output mechanically connected to the actuating member, means for selectively activating said motor means to move said actuating member from either of said first or second position and toward the other of said first or second position, means for repeatedly determining the actual position of said actuating member as said actuating member moves from either of said first or second position and toward the other of said first or second position, means responsive to said determining means for automatically deactivating said motor means when said actuating member is at said other of said first or second position, and wherein said motor activating and deactivating means further comprises electrical circuit means, memory means accessible to said circuit means, said circuit means having means for storing upon operator command the output from said position determining means as values in said memory means corresponding to said first and second positions for said actuating member.