The new safety valve against unintended car movement DSV-A3
Safety valve (additional to the lift valve) to protect against unintended downward car movement as per EN 81-2:2010 (A3)
Complies, together with appropriate door movement sensors and control system elements, with the requirements of the standard for a “means” of protection
Must be built into any new system after 2012
Type-examination certified by TÜV SÜD
Compatible with control valves from any manufacturer
incl. ball valve
To the "means" the standard requires does not only the DSV-A3 belong, but a sensor unit that detects unintended movement of the car, and a controller that processes the signal and interrupts the power supply. Most manufacturers' controllers meet the standards needs by now. You can contact them directly to this matter.
About the means and the standard we created a info-site with technical article.