special type for completion with fans Kanal-KVARK-KP and Kanal-KVARK-KP-ES;
- prevents the flow of air and non-explosive air mixtures from different rooms of one ventilation system;
- prevents the ingress of outside air and precipitation into the serviced room after the fan is switched off;
- the transported air medium must not contain substances aggressive towards aluminium and aluminium alloys;
- the permissible temperature of the transported air is from -30°C to +50°C;
- the content of sticky substances and fibrous materials is not allowed;
-content of dust and solid impurities is allowed not more than 0.1 g/m3;
-The minimum air velocity through the valve section should be:
- on the horizontal section not less than 1.5 - 2 m/s;
- on the vertical section not less than 4 m/s;
-maximum velocity through the valve cross-section not more than 9 m/s.
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