What sets us apart
SITEMA Safety Catchers function according to a self-intensifying principle, similar to a wedge system.
The Safety Catcher is depressurized to secure the load, which brings the clamping system into contact with the rod and secures the load.
There is no holding force yet in this state, and the Safety Catcher can be opened again simply by pressurizing it.
Reversing/retracting is not necessary.
Only when the load moves down does the clamping system contract and hold the load.
Only when the Safety Catcher has taken over the load, i.e. when it was needed, and the clamping system has contracted is simple pressurization no longer sufficient to release it for safety reasons.
The clamping system must be additionally relieved.
Relief automatically ensures that another system has safely taken over the load before the clamping system can be opened.
Far from being a drawback, this system-related behavior is a great safety advantage.
Advantages of using SITEMA's self-intensifying technology for protecting persons and machinery
- Release under load is impossible, thereby automatically ensuring safety against unintentional release.
- Release is possible only after relieving the clamping head, automatically ensuring safe load transfer.
- Consequently, release is also gentle when used on cylinders.
- The clamping system is strained only when actually necessary.
- This ensures a long service life (B10D values up to 6 million).
- Safety factor > 2 built in.
- Upward movement is possible even in a depressurized state, e.g. to rescue trapped persons.
- Loads up to 220 kN can be secured pneumatically as well.
- DGUV approval on all standard Safety Catchers and safety brakes.
Comparison: characteristics of non-self-intensifying clamping systems when securing suspended loads
- Release is possible under load as well; the load to be secured can therefore still fall down.
- Release is possible even without prior load transfer, potentially resulting in a hazardous situation.
- Depending on the pressure on the cylinder, the load will dip down or jump up on release.
- The clamping system is under full load at all times.
- This shortens the service life.
- Safety factor generally not included.
- It is not possible to move up in the event of a pressure failure. People may remain trapped.
- High holding forces are generally possible only by hydraulic means.
- Generally no DGUV approval.