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Failsafe
   
Definition of the fail-safe function
A valve is fail-safe if it automatically moves into its safety position in the event of a power failure. The most common requirement during a power failure, is for the valve to automatically close. If a valve is automated by an electric actuator, an auxiliary power supply will be needed to move the valve into the safety position.  

  • The TA Failsafe System E 71 uses a backup voltage to activate the actuator should a power failure occur.

  • The TA FM System uses the power of a closing spring to operate the valve should a power failure occur.  

An additional feature of the fail-safe function is the ability to shut the valve off if:

(1) The power is cut or

(2) The electric actuator itself fails. This is possible if the fail-safe mechanism does not require the gearbox of the actuator to operate the valve.
  • The TA FM System does not require the gear box of the actuator to move the valve into its safety position. The force of the spring is transmitted directly over the valve’s shaft. The valve can therefore move into the safety position should the actuator itself fail. This function complies to more extensive fail-safe demands to be met.