Proportional valve offers increased process quality

29 July 2015

Festo has launched a new proportional valve – the VPPX  – with an external sensor input which is said to offer improved performance, maximum flexibility and excellent process quality.

The valve is a proportional integral derivative (PID) controller suited to use in industrial control systems found in process, packaging and water and wastewater applications.  The incorporation of an external sensor means friction, hysteresis and leakage are cancelled out which enables engineers to build faster and more accurate machines and systems, while enhancing the quality and efficiency of their processes.  Time savings can also be made even in simple pressure regulation with the sensor integrated into the system.
The VPPX valve is programmed via Festo Configuration Tools (FCT) and the user can select the control circuit (internal/external), the control behaviour (direct/inverted), the setpoint value, actual value and sensor signals (current/voltage).  Previously, users had to specify whether the control signals were provided as current or voltage when designing the system.  Users now have increased flexibility  and can decide at the last minute how the signal should be transferred to the control system. 
The setpoint value, initial pressure and external sensor’s signal can be viewed in real time on an oscilloscope, and parameters can be adjusted for the optimum control characteristics, with set values recorded for future use.

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