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IMI Buschjost control valve impresses with its new stepper motor

Revised IMI Buschjost control valve: the proven DC motor with integrated positioner has been replaced by a long-life stepper motor. A newly developed control card completes the drive.

IMI Buschjost is one of IMI Precision Engineering's leading brands and has proven its worth for over 25 years with its electric motor-driven actuators and control valves for general mechanical and plant engineering. They provide users with the ability of controlling and regulating the most different media in a significantly more precise manner. The range of drive systems has been extended recently: drive 9668 has been equipped with a stepper motor of the latest generation. A newly developed control card for the integrated positioner completes the drive.


"In early 2016, we replaced the DC motor of the 9650 by a new stepper motor," explains Friedrich-Karl Boeker, product manager at IMI Precision Engineering. "It is significantly more robust and durable in comparison to its predecessor. The DC motor of the 9651 still remains part of our product range, but in the medium term it will also be replaced by a stepper motor."


Users can benefit in several ways from the revision of the IMI Buschjost control valve: Firstly, manufacturing tolerances are significantly reduced in comparison to the previous model with the DC motor due to the factory calibration of each stepper motor. This also allows achieving an improvement in regulation performance. Secondly, functioning of the valve is ensured even under difficult conditions: the electronic control unit detects increased load torques, for example, due to a downtime or an operating pressure above 10 bar, and increases the motor current gradually up to the maximum possible overload torque. If there is a blockage of the valve, the user is alerted by a flashing red LED bulb.


The speed of the drive speaks for itself: the full travel range of the stepper motor requires only 5 seconds. Users can also draw useful information from the position feedback signal with 4-20 or 0-20 milliamperes for the further control of the application.


While the drive system has been revised, the control valve has remained almost identical and is equipped with proven flat rotary slides made of robust and wear-resistant ceramic.

 
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