Prevent a Cylinder from Moving When the Compressed Air System Unexpectedly Depressurises

A blocking valve prevents a cylinder from moving when your compressed air system unexpectedly depressurises. This avoids dangerous situations such as falling cylinders carrying a load.

Operation

To use this safety function, a 2/2 controlled valve must be screwed into one or both cylinder ports. The cylinder is filled in the usual way (via a 5/2 valve) from port 1 to port 2 through the check valve. If the compressed air supply fails, the check valve blocks the outflowing air so that the relevant cylinder side remains pressurised and cannot move.

To allow the cylinder to move normally, the 2/2 valve’s pilot port X must provide a free passage to the cylinder port. This is done by using the pressure from the filling side (the opposite cylinder port) to release the exhausting side. When using two blocking valves, they are operated in a crosswise manner.