New stepper motor enhances IMI Precision Engineering control valve

31st March 2016
Posted By : Jacqueline Regnier
New stepper motor enhances IMI Precision Engineering control valve

IMI Precision Engineering has created the next generation of its popular IMI Buschjost control valve range by equipping drive system 9668 with an integral stepper motor and newly-developed control card.

Previously driven by a DC motor, the new model benefits from significantly reduced manufacturing tolerances due to the factory calibration of each stepper motor, meaning regulation performance is enhanced. Additionally, valve function under challenging conditions is improved – should operating pressures exceed 10 bar, for example, the electronic control unit detects increased load torques and gradually raises the motor current to the maximum possible overload torque. Users are alerted to any blockages by a flashing indicator light.

The combination of the control valve with the stepper motor has also resulted in increased speed: the full travel range of the motor can be achieved in only five seconds. Additionally, closer control of the unit is now possible through the position feedback single at 4-20 or 0-20 milliamperes.

Friedrich-Karl Boker, Product Manager at IMI Precision Engineering, explained: “The creation of this improved control valve was a natural progression following the replacement of DC motors with stepper motors in other product ranges. The DC motor of the 9650 was replaced by the new 9668 model in early 2016 while the 9651 will soon also undergo replacement.The new model is significantly more robust and durable while offering the additional benefits of enhanced speed and controllability.

“The control valve itself remains unchanged from its predecessor which customers have come to know and trust – the robust and wear-resistant ceramic flat rotary slides are still in place, with changes made only to the drive system.”

 


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