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This product is the FHF-WSDc-FK type circular flange electrically controlled fire damper, designed in accordance with GB 15930-2007 and GB 50243 standards, and is suitable for fire barrier applications in ventilation, air conditioning, dust removal, and other duct systems. The valve body is entirely constructed of 304 stainless steel (including the cylinder, flange, blades, and shaft), offering strong corrosion resistance and adaptability to harsh environments such as chemical plants, kitchens, and humid conditions. The nominal diameter covers Φ100–1250 mm, with high-temperature silicone rubber strips for sealing, a blade gap of ≤2 mm after closure, a fire resistance integrity rating of 1.5 hours (90 minutes), a maximum allowable static pressure of ≤1500 Pa, and an airflow velocity of ≤15 m/s.
The product features dual closing safeguards: upon fire alarm linkage, a DC24V power supply (operating current ≤0.7A) activates the spring-return actuator to close the damper instantaneously, with a response time of ≤3 s; when the temperature inside the duct rises to 70°C ± 3°C, the fusible link melts, triggering a purely mechanical spring-driven automatic closure. These two mechanisms operate independently without interference. Built-in two sets of passive micro-switches provide fully open/fully closed feedback signals to the fire alarm control panel. After power loss, manual resetting is required via the external red handle. As a fire barrier component of Shanghai Shudun Intelligent Technology Co., Ltd., this product can be widely applied in various building ventilation systems to achieve reliable fire isolation through integrated fire alarm linkage and high-temperature self-protection.
The FHF-WSDc-FK type circular electrically operated fire damper, manufactured by Shanghai Shudun Intelligent Technology Co., Ltd., is designed to provide reliable fire barrier protection for ventilation and air conditioning duct systems. The valve body is constructed entirely of 304 stainless steel, offering excellent corrosion resistance and suitability for special environments such as chemical plants, kitchens, and humid conditions. The product complies with the national standard GB 15930-2007, with diameters ranging from Φ100 to 1250 mm, accommodating various conventional duct installation requirements.
The damper is normally held in the open position during regular operation. In the event of a fire, it can be automatically closed through two independent methods: first, via an electrical closure triggered by a DC24V linkage signal from the fire alarm control panel; second, through mechanical closure when the temperature inside the duct reaches 70°C, causing the fusible link to melt. After closure, the damper's feedback signal is transmitted to the fire alarm control panel in real time. Manual resetting is required after the fire alarm has been cleared. With reliable actuation and rugged construction, this product serves as a practical supporting device in building fire compartmentation systems.
Product Model | FHF-WSDc-FK |
Valve Body Material | Entire unit made of 304 stainless steel (cylinder, top/bottom flanges, blades, and valve shaft are all stainless steel; corrosion-resistant, suitable for chemical, kitchen, and humid environments) |
Structural Form | Circular double-flange straight-through type, single/double-leaf opposed blades, 90° opening/closing angle |
Standard Nominal Diameter (DN) | Φ100, Φ120, 160, 200, 250, 320, 400, 500, 630, 800, 1000, 1250mm |
Cylinder Height | DN ≤ 320: Cylinder Height = DN; DN > 320: Uniform cylinder height of 320mm |
Flange Specifications | Circular stamped flange, compatible with national standard metal circular duct bolt holes, flange width 25~40mm (thickness increases with pipe diameter) |
Sealing Performance | High-temperature resistant silicone fireproof sealing strip; blade gap ≤ 2mm when closed, meeting airtightness standards |
Valve Shaft / Bushing | 304 stainless steel valve shaft + graphite self-lubricating bushing |
Rated Control Voltage | DC24V (allowable fluctuation range: DC20.4V~26.4V, ±10%) |
Action Mode | Normally open; DC24V powered drive for instant valve closure (spring-return actuator) |
Rated Action Current | ≤ 0.7A (standard load for fire protection interlocking circuits) |
Opening/Closing Response Time | Fully closed within ≤ 3s after DC24V power-on |
Signal Feedback | Built-in 2 sets of passive micro-switches (NO/NC); outputs passive contact signals for fully open/closed valve status (AC250V/3A load capacity); compatible with fire alarm control panel feedback status |
Reset Method | Manual external red pull-cord mechanical reset; cannot auto-reset after power loss; must be manually pulled on-site to reset to normally open position |
Temperature Sensor Action Temperature | 70℃ ± 3℃ (standard fire protection temperature for ventilation systems) |
Maximum Allowable Static Pressure | ≤ 1500Pa |
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