3. VERSIONS
Depending on the type of the applied element that keeps the valve’s partition in the open position, as
well as furnishing, there are the following versions of the fire safety valves:
3.1. HO version
– with lever-spring mechanism, opened manually.
Opening of the valve occurs by turning the manual lever, during which the return spring is stretched.
The cut-off partition of the valve is kept open by the band, manual lever and release element
suspended on the peg of the mechanical thermal element. Closure of the cut-off valve can occur as a
result of:
- automatically due to increase in the temperature of the flowing air to the temperature where the
heat-responsive device of the thermal trigger breaks (gets unsoldered (standard 72±5°C).
- Manually as a result of release of manual lever from the trigger – this allows for periodical
closure of the partition to control valve operation.
The operation of the thermal trigger (mechanical heat-responsive device) involves air stream flowing
round the thermal element (glass ball or soldered metal plates) causes heating of the liquid inside the
ball (or solder), which causes breaking of the glass cover (or dissolution of solder), and as a
consequence the valve closes when the air flowing through the installation achieves the temperature
of ~72°C.
V370/HO
RK370/HO
The actuation of the heat-responsive device releases the peg of the mechanical thermal element
based on it, and the latter, by moving backwards, triggers the element blocking the partition of the
valve blocking it in the open position.
The spring mounted on drive shaft, via the lever system, closes and keeps the valve closed, pressing
it to the resistance angle bars.
3.2. HE version –
with lever-spring
mechanism, opened manually.
The structure and operation of the valve in this variant is identical as in the case of HO variant. HE
valves have a micro-switch installed, which via relevant electrical system allows for signalling the
position of the valve partition, and makes it possible to use it in control systems (e.g. switching off the
fan when the valve is closed).
