Multi Blade Louver Damper

Connection Type

Flange, Welding

Actuation Type

Lever, Gear, Pneumatic, Electric, Hydraulic

Multi Blade Louver Damper is a high-performance flow control device engineered for precise regulation and tight shut-off of air, gas, or flue gas in industrial ventilation, dust collection, and boiler flue systems. Featuring a series of parallel blades linked by a synchronized linkage mechanism, it enables smooth, linear adjustment of airflow volume according to operational demands. Its robust construction—typically crafted from heavy-gauge steel or corrosion-resistant alloys—ensures reliable performance in harsh conditions, making it a staple component for optimizing system efficiency and safety across HVAC, power generation, and petrochemical sectors.

ZZJG's Advantages

Precise Flow RegulationSynchronized blade operation delivers linear airflow control, allowing accurate adjustment of flow rates to match real-time system requirements.
Excellent Sealing PerformanceOptimized blade design with optional gasket seals achieves tight shut-off, preventing unwanted air leakage and reducing energy waste.
Durable & Harsh-environment ResistantHeavy-duty material selection and reinforced structure withstand high temperatures, corrosive gases, and abrasive particulate matter for long service life.
Easy Installation & MaintenanceCompact modular design fits standard duct sizes; quick-access linkage and replaceable parts minimize downtime during inspection and repair.
Broad System CompatibilityAdaptable to rectangular or circular ducts, and configurable with manual, electric, or pneumatic actuators to suit diverse industrial control systems.

Product Details

Spec	Detail
Size Range	DN200~6000mm (NPS8"~240")
Pressure Class	PN0.6MPa (Class150)
Matrial	Cast Iron, Ductile Iron, WCB, LCB, CF8, CF8M, CF3, CF3M, A890 4A etc.
Standards	ANSI, API, CE, DIN, EAC, JIS, ISO, EN

Professional Quality

Various Types

ZZJG offers one of the most comprehensive butterfly valve product lines from a single manufacturer including triple-offset butterfly valves, double-offset butterfly valves, high performance butterfly valves etc.

Service Support

ZZJG range of aftermarket services encompasses valve repair, refurbishment, maintenance, custom engineering solutions, and genuine OEM spare parts to sustain optimal equipment performance well after installation.

Processing Ability

ZZJG employs advanced manufacturing technologies using state-of-the-art machinery and equipment to ensure our products perform in the most challenging environments.

Why ZZJG Butterfly Valves?

API 609 International Certification

Fully compliant with API 609 international standard, covering all structural types including double flange, lug, and wafer types, and has obtained global market access qualifications for the petroleum, chemical, and power industries. Class 150 ~ 2500 (PN20 ~ PN420), NPS2" ~ NPS200" (DN50 ~ DN6000), temperature range -40℃ ~ 600℃, zero-leakage, and fireproof with API 607.

Leading Eccentric Structure Design

Double and triple eccentric design, the valve shaft, valve seat, and pipeline centerline are precisely offset, significantly reducing friction and wear. Bidirectional zero-leakage pressure, with built-in anti-sludge and self-cleaning functions, suitable for harsh media such as sewage and slurry, and with a service life more than 3 times longer than conventional butterfly valves.

Reliable and Guaranteed Quality

Founded in 1981 and located in the valve capital of China, this company is a certified National High-Tech Enterprise with R&D investment exceeding 5%. Its 12-step full-process testing procedure, from material verification to finished product delivery, adheres to API 609 inspection standards to ensure zero-defect delivery.

Customized Services for All Conditions

Adaptable to all media including water, steam, oil, acids, alkalis, and gases, meeting the needs of core industries covered by API 609, such as petroleum, natural gas, chemical, and power. Specialized models are developed for different scenarios, such as fully welded, leak-free butterfly valves for heating pipelines and hydraulically controlled slow-closing check valves for hydropower stations.