With this safety snap, an unintended release of an override valve is impossible. This gives a complete protection that no critical movement of the corresponding mechanism can happen, whilst some is working on the section. The new Safety Snap can be added to any track of the new Heye valve block. These manual snaps complete the electric safety function, already being used since many years.
The Heye valve block concept consists of two blocks, on for the blank side and one for the blow side. The operator can directly see what is happening before him, nothing is hidden (other suppliers use one valve block for both sides and have bad or no sight to the other side). In addition, Heye uses a metal cover for the valve blocks, so an accidental release of a valve is excluded.