Main Technical Parameters
Fuse operating temperature: 70°C
Valve fire resistance rating: 1.5 h
Air leakage rate (at differential pressure 300 Pa): ＜700 m³/m²·h
Resistance coefficient at fully open state: ＜0.5
Valve body length: L=250 mm

Structure
Main components: valve body, decorative air outlet, valve blade, shaft, shaft bush, actuator.
Thickness of rectangular valve body: L=250 mm.
All valve flanges adopt TDF flange, with flange width of 30–40 mm.
When the H dimension is ≥1000 mm, two actuators shall be installed.

Performance
The valve is normally open under normal conditions. When the air flow temperature inside the duct reaches 70°C, the fuse operates and the valve closes automatically.
The valve can be manually opened and closed, and can be manually reset after operation.
It is provided with a 6‑gear air volume adjusting switch and can output valve closing signal.