The valve fault protection device VA-700 series is often used in conjunction with a valve positioner to keep the regulating valve or cylinder in place or return to the fully open or fully closed position in the event of a three-break fault (out of gas, power or signal).

Highly integrated, modular connection, easy to install.
The state of the regulating valve after a specific fault can be changed on site, with sensitive triggering and high accuracy.
Comply with IEC61508 system safety specification, SIL certification level SIL3.