フェロー List of Products and Services

We offer special dampers such as atmospheric release valves, switching valves, and poppet valves. These dampers are used to switch the flow of air and dust within ducts or to release pressure, operated by air movement, electric operation, or the force of gravity. Please feel free to contact us when you need assistance. 【Features】 ■ The gravity type can be adjusted to open at any pressure relative to the duct internal pressure. ■ By using packing (rubber or metal), high sealing performance can be ensured. ■ Consideration is given to prevent distortion due to temperature differences inside and outside the duct. *For more details, please download the PDF or feel free to contact us.

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We offer special dampers for powder transport (control) such as knife gates, rotary valves, and double flap dampers. These dampers are used to control (ON-OFF) powders around coal mills, bag filters, electric furnaces, and electric dust collectors. Additionally, regarding product structure, you can choose between flap type and gate type depending on the powder characteristics, intended use, and installation location. 【Features】 ■ A lineup that can handle temperatures from room temperature to 1000°C (water-cooled) ■ A lineup tailored to powder characteristics such as high corrosion resistance and wear resistance ■ For double flap dampers, the valve body opening angle is sufficiently secured for smooth powder flow ■ For gate valves, it is possible to secure 100% opening area, ensuring cut-off or high sealing performance *For more details, please download the PDF or feel free to contact us.

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The "Slide Gate Damper" is typically used as a simple duct during normal operation, but it is employed for blocking lines that require high sealing performance against high concentrations of strongly adhesive dust. The sealing methods can be selected from options such as sealing with packing only, forced sealing with pressing bolts, sealing by injecting sealing air, and tightening cam types. For the opening and closing of the blades, there are options that utilize gravity descent with wire rope or chain block systems, as well as powered systems such as screw rod, chain, wire rope, and cylinder rod types. 【Features】 ■ No pressure loss when the damper is fully open ■ Can reduce the space between surfaces ■ Guarantees complete opening and closing operation ■ Ensures complete sealing by using an elastic sheet and injecting sealing air ■ The blade opening type allows for confirmation of the blade's condition when fully open *For more details, please download the PDF or feel free to contact us.

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The "Double Flap Damper" has a unidirectional operation of the blades, allowing the sealing part to be placed on the outflow side, which helps protect the sealing packing from direct exposure to gas flow and reduces the risk of damage. It is used for backflow prevention, high-seal bypass ducts, and for closing during maintenance. It is suitable for use in gas with high dust concentration. Additionally, since the two blades swing within the casing, it can reduce the face-to-face distance and weight to about 1/2 to 1/4 compared to a single swing valve. 【Features】 ■ High sealing capability ■ Protection of the sealing part from dust in the duct ■ Ability to keep the face-to-face distance narrow ■ Wear resistance measures are possible ■ The reinforcement parts of the blades adopt a structure that minimizes turbulence, ensuring low pressure loss *For more details, please download the PDF or feel free to contact us.

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The "Single Flap Damper" is used for backflow prevention, high-seal bypass ducts, and for closing off during maintenance. By rotating the blade normally from 0 to 90 degrees, it is possible to shut off the flow. We can manufacture air-operated, electric, hydraulic, and manual types. Additionally, by adjusting the mounting position of the shaft, it is possible to reduce torque compared to standard flap dampers, making it economical. 【Features】 ■ High sealing capability ■ Ability to reduce torque ■ Protection of the sealing area from dust and debris in the duct ■ Low pressure loss *For more details, please download the PDF or feel free to contact us.

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The "louver damper" is used for shut-off, flow control, and balancing, similar to a butterfly damper, and can be installed in narrow spaces when fitting into ducts. By rotating the blades normally from 0 to 90 degrees, flow control and shut-off can be achieved. Additionally, there are two types of blade rotation: parallel opening and closing (for ON-OFF use) and opposing opening and closing (for control use). 【Features】 ■ Rectifying effects can be expected when the damper is fully open. ■ For opposing opening and closing dampers, a large flow control range can be secured. ■ High sealing is ensured by using elastic sheets. ■ It can adapt to temperature changes from low to high and maintain high sealing in response to temperature differences within the duct. ■ It can be used as a control damper for large ducts. *For more details, please download the PDF or feel free to contact us.

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The "Butterfly Damper" is commonly used for shut-off, flow control, and balancing in general applications. It can be installed in narrow spaces when mounted in ducts. It consists of a casing, blades, shaft, gland device, sealing device, and drive unit. Additionally, by rotating the blades normally between 0° and 90°, flow control and shut-off can be achieved. 【Features】 ■ Can minimize pressure loss when the damper is fully open ■ Provides a wide range for flow control ■ Ensures high sealing by using an elastic sheet ■ Can adapt to temperature changes from low to high temperatures and temperature differences within the duct, ensuring high sealing ■ Suitable for continuous operation *For more details, please download the PDF or feel free to contact us.

• Other air conditioning equipment