Double Louvre Damper Gate
Twin-row louvre gate with sealing air between the blade banks — 99.9 % sealing efficiency and pressure loss below 50 Pa when open.
Flue duct damper manufacturer · Yancheng, China
Flue gas damper gates built for zero-leak isolation
Double louvre dampers, FGD isolation gates, round and square air dampers, slide gates and spring supports — designed, fabricated and tested in one works, then shipped worldwide.
ISO 9001 quality system
6 utility model patents
Export packing & documents
99.9%Sealing efficiency, double louvre gate
< 50 PaPressure loss when fully open
90°Blade travel, 60–75 s stroke
24 hResponse to every enquiry
Product range
Damper gates and duct components for the whole flue gas path
From the boiler outlet to the stack, every isolation and regulating position is covered by a standard product — and anything outside the range is built to drawing.
FGD Flue Gas Damper Gate
Louvre-type gate for flue gas desulfurization systems, supplied as single-blade or zero-leak double-blade with sealing air.
Electric Double-Shaft Flue Duct Damper
Two parallel blade shafts linked by tie rods, driven by electric actuators — built for very large rectangular flue sections.
Regulating Damper Air Door
Linear-characteristic regulating damper for cold and hot air ducts, with ball-jointed linkage and no lost motion.
Double-Shaft Round Damper Gate
Circular double-shaft gate for large diameter flue ducts, with bolted flange mounting and linked blade banks.
Guillotine Isolation Gate
A single plate that drops into the gas path to give a visible physical break, used for maintenance isolation on flue ducts where a louvre gate cannot guarantee a seal.
Why buyers choose Baoze
One works, from the drawing to the dispatch note
Factory-direct supply
Technical design, production, quality inspection, sales and after-sales service sit under one integrated management system, so nothing is lost between the drawing and the delivered gate.
Years of application experience
Our dampers serve the power, chemical, petroleum and metallurgy industries, and the company is certified to a quality management system — the basis for reliable products and after-sales support.
After-sales without the wait
Working in the spirit of innovation and progress, we aim at long, friendly and mutually beneficial relationships — and answer service requests the same working day.
Catalogue
Every position in the duct, covered
Fourteen product families across three groups. Pick the position you need to isolate or regulate.
Flue Duct Damper Gate
Heavy-duty isolation gates for boiler flue ducts, with single or double blade rows.
Flue Gas Damper Gate
Double louvre gas dampers with sealing air, designed for zero-leakage duty.
Flue Duct Air Damper
Regulating and shut-off dampers for cold and hot air ducts with linear characteristics.
Desulfurization Damper Gate
Corrosion-resistant gates for wet FGD inlet, outlet and bypass service.
Round Air Damper
Circular isolation and throttling dampers for round air and flue ducts.
Square Air Damper
Rectangular multi-blade dampers for large air ducts and rectangular flue runs.
Isolation Gate
Guillotine-type gates that give a physical, visible break in the gas path.
Flap Gate
Light-duty flap dampers for low-pressure air and dust-laden gas lines.
Coal Gate
Abrasion-resistant gates for coal bunkers, feeders and pulverizer outlets.
Damper Valve
Compact blade valves for tight shut-off on small and medium ducts.
Slide Gate Valve
Saddle-seat slide gates with hard and soft sealing for dust-laden ducts.
Isolation Valve
Zero-leakage valves for isolating gas and air branches during maintenance.
Gate Valve (Duct Type)
Rising-spindle gate valves for isolating dust and ash handling lines.
Spring Support & Hanger
Variable and constant spring supports, rigid hangers and sliding supports for ductwork.
Industries
Where our dampers are in service
Power generation is our home market; the same construction logic carries into FGD, petrochemical, metallurgy, chemical and cement plants.
Power Generation
Damper gates, air dampers and duct components for coal, gas and biomass power plants.
Flue Gas Desulfurization
Zero-leakage isolation for wet limestone-gypsum FGD absorbers and wet ESP trains.
Petrochemical & Refining
Duct dampers, isolation gates and supports for refinery heaters, FCC and utility systems.
Metallurgy & Steel
Abrasion-resistant dampers and gates for sinter, blast furnace and coke oven gas lines.
Chemical & Fertilizer
Corrosion-resistant duct valves and dampers for acid, alkali and fertilizer process lines.
Cement & Building Materials
Heavy-duty dampers for kiln, preheater and raw mill gas circuits.
Solutions
Application answers, not just catalogue numbers
A gate is only right when it matches the duty at its own position. These are the five application problems we are asked about most often, and how we solve them.
All solutions
01
FGD Inlet & Outlet Isolation
A matched set of raw gas, clean gas and bypass gates that lets the absorber be opened while the unit stays on load.
02
Boiler Duct Isolation
Air preheater, ID fan and stack isolation using double-shaft gates sized to the duct section.
03
Air & Gas Flow Regulation
Linear-characteristic dampers with ball-jointed linkage for stable control loops.
04
Desulfurization Corrosion Protection
Material and lining selection for the wet, chloride-bearing sections of the FGD duct.
05
Custom Non-Standard Duct Components
Design and fabrication of non-standard dampers, gates, supports and flue components to drawing.
2008Works established
60People on the floor
14Product families
6Sectors served
Design, fabrication and pressure testing under one roof in Yancheng, Jiangsu — drawings issued for approval before any steel is cut.
About Baoze
A specialist works, not a trading desk
Yancheng Baoze Power & Petrochemical Machinery Co., Ltd. has years of production and design experience in the flue work of power stations, with a strong technical team and refined workmanship. Years of innovation have made us a manufacturer with a complete range, many specifications, reliable quality and good service.
We build to the Typical Design of Flue, Air and Pulverized Coal Piping Components for Fossil Fuel Power Plants prepared by the Northwest Electric Power Design Institute and the East China Design Institute, and our equipment is in service with customers throughout China.
- Pipe supports, spring hangers, air dampers, damper gates, slide gates and compensators
- Non-standard and site-measured components built to drawing
- Visitors welcome at the works — inspections are encouraged before shipment
Certificates
Quality system and patents
ISO 9001 certification and utility model patents covering damper sealing structures and drive arrangements.
Technical news
Notes from the drawing office
Sealing systems, material selection and maintenance practice — written by the people who build the gates.
Five Damper Gate Selection Mistakes That Show Up Two Years Later
None of these mistakes look like mistakes at the quotation stage. All of them cost real money once the unit…
Mounting Orientation: Why a Damper That Works Sideways Fails Upright
Shaft horizontal or vertical, actuator above or below, housing on the pressure side or the suction side…
Electric or Pneumatic: Choosing the Actuator Before It Chooses for You
Speed, fail position, torque at speed and what the plant already knows how to maintain. The four questions…
How Much Sealing Air Does a Damper Gate Actually Need?
The 0.5 % rule of thumb, when it is wrong, and the measurement that proves the seal on the day the permit is…
Contact
Tell us the position, and we will specify the gate
Send the duct section, the design temperature and pressure difference, and the duty point. A general arrangement drawing and a firm quotation come back within one working day.
Works & office
No. 5 Hede Road, Sheyang Industrial Park, Yancheng, Jiangsu, China
Request a quotation
Tell us the duct section, design temperature and pressure difference. We will come back with a general arrangement drawing and a price.