Functioning
The FIRESAFE R90 with 100% unrestricted passage is always open during operation of the system. In case of danger, smoke detectors, temperature switches and other sensors will send a signal to the operating unit. Inside the operating unit, the power circuit to the engine is interrupted and the built-in spring return actuator will currentlessly close the FIRESAFE R90. Depending on the conveyed medium (solid, liquid, gaseous) in the extraction pipe, the FIRESAFE R90 is only able to close as soon as there is no medium remaining in the closing area and the volume flow is lowered to 0 m/s. Due to built-in limit switches inside the engine the closed as well as the open position can be requested at all times.
During the closing procedure, the endless tape running over two opposite wheels is shifted in a way which causes the holes possessing the same diameters as the distance tube and the connection tube to lie on the top and the bottom edge of the housing.
In between the endless tape an isolation block is situated, which is also called thermo block. The thermo block has a distance tube shrink-wrapped into its middle part, which has small holes in it.
The thermo block is filled with a special material, namely HYDROSAFE. This material is able to convert the gauging water which is needed for the production of the casting compound, into 95% crystalline water (physical water).
When heat is used on the thermo block, the crystalline water in the HYDROSAFE is re-liquified and due to the pressure developing inside the thermo block, the water is pushed into distance tube.
The water collecting in the cavity (nominal size and height of the thermo block) is unable to escape from there. The closing strap being forced toward both sides of the thermo block swollen sealing strips obstructs the water's way out of the cavity. Thus, the liquid water evaporates inside the cavity, given the circumstances of an extended period of time and the temperature rising above 100°C
The water vapour cools down the strap's side facing the fire and therefore gives it the ability to withhold the fire for the duration of 90 minutes and up.
1) HYDROSAFE is a casting and smoothing compound with the general construction supervision test report of P-3943/8797. HYDROSAFE was developed in a collaboration of the companies GSB and gräfix. It can also be used for filling and scoffing gaps in walls and ceilings. It is especially well suited for filling the gaps resulting from installation of doorframes, tubes, fire protection systems etc. HYDROSAFE is certified according to DIN 4102 A1.
