Precision Metered Discharge & Vacuum-Sealing Airlock Valve
The YJD-A Square Rotary Feeder (Rotary Airlock Valve) is a metered discharge device engineered to extract bulk dry powders, pellets, and granules from hoppers, silos, baghouse dust collectors, and cyclone separators. Featuring a compact square-flange housing and a multi-vane rotating impeller, it discharges materials continuously while maintaining an airtight pressure differential of -0.02 to +0.10 MPa with an air leakage rate under 1%. It isolates upstream vacuum or positive-pressure zones from ambient air, preventing system pressure losses and fugitive dust leakage across cement, power, chemical, and grain processing facilities.
Featured Model Variants
YJD-A-6 | Chemical & Food Dosing Unit
Inlet/Outlet: 250×250 mm | Capacity: 6.0 m³/h | Power: 1.5 kW | Material: Stainless Steel
Ideal for hygienic, corrosive, or contamination-sensitive chemical and food powder handling.
YJD-A-12 | Industrial Metallurgy & Ash Line
Inlet/Outlet: 400×400 mm | Capacity: 20.0 m³/h | Power: 3.0 kW | Material: Stainless / Carbon Steel
Engineered for continuous fly ash discharge beneath mid-sized baghouses and precipitators.
YJD-A-20 | High-Volume Industrial System
Inlet/Outlet: 600×600 mm | Capacity: 60.0 m³/h | Power: 7.5 kW | Material: Stainless / Alloy Steel
High-capacity airlock feeder built for large-scale mining, cement silos, and power plant filtration.
Key Technical Specifications
Throughput volumes from 1.5 to 60 m³/h across square port interfaces ranging from 150×150 mm to 600×600 mm. Operates within -0.02 to +0.10 MPa differential pressure at smooth rotor speeds of 24–48 rpm.Powered by compact 0.55 kW to 7.5 kW gear motors with IP54/IP55 protection and low acoustic output (≤ 65 dB(A)).
Why Choose the YJD-A Square Rotary Feeder?
Superior Airlock Seal: Delivers over 95% sealing efficiency, preventing pressure loss and maintaining system vacuum during continuous discharge.
Precise Metering: Accurately controls the flow of powders and granules from hoppers, dust collectors, and cyclones.
Versatile Capacity: Accommodates flows from 1.5 to 60 cubic meters per hour, with square inlet sizes ranging from 150x150 mm to 600x600 mm.
Customizable Build: Rotor material, vane count, and housing can be tailored to withstand your specific material's abrasiveness and pressure requirements.
Industry Adaptability: Proven in heavy industry (cement and power plants) and available in stainless steel for strict food and chemical hygiene standards.
Why Leading Plants Choose SENOTAY YJD-A Square Rotary Feeder
Factory-Direct Pricing. Certified Quality. Dedicated Support.
Best Price Guarantee
Certified & Compliant
Fast, Reliable Delivery
Types and Specifications of YJD-A Square Unloader
Type No. | Inlet Size (mm) | Outlet Size (mm) | Capacity (m³/h) | Power (kW) | Material Options | Application Field |
YJD-A-2 | 150×150 | 150×150 | 1.5 | 0.75 | Cast iron | Small dust unloaders |
YJD-A-4 | 200×200 | 200×200 | 3.0 | 1.1 | Carbon steel | Cement |
YJD-A-6 | 250×250 | 250×250 | 6.0 | 1.5 | Stainless steel | Chemical |
YJD-A-8 | 300×300 | 300×300 | 10 | 1.5 | Cast iron | Power plants |
YJD-A-10 | 350×350 | 350×350 | 15 | 2.2 | Carbon steel | Food & grain |
YJD-A-12 | 400×400 | 400×400 | 20 | 3.0 | Stainless steel | Metallurgy |
YJD-A-14 | 450×450 | 450×450 | 25 | 3.0 | Alloy steel | Mining |
YJD-A-16 | 500×500 | 500×500 | 35 | 4.0 | Carbon steel | Environmental systems |
YJD-A-18 | 550×550 | 550×550 | 45 | 5.5 | Cast iron | Large filtration systems |
YJD-A-20 | 600×600 | 600×600 | 60 | 7.5 | Stainless steel | Custom high-volume systems |
Product Description
The YJD-A-Square Unloader features a compact square design and is especially suitable for installations where space constraints exist. With robust construction and precise engineering, it ensures:
Stable, continuous discharge.
Durable body and wear-resistant components.
Excellent airtight properties.
Easy installation and maintenance.
It is compatible with a broad range of powders and granules, from cement, fly ash and lime powder to flour and chemical materials.
YJD-A Square Unloader — Technical Specification Table
Physical Dimensions | Performance Ratings | Material & Construction | Operational Data | Certifications & Lifecycle |
200–500 mm | -0.02 to +0.10 MPa | Cast Iron HT250 / SS304 | 0.55–3.0 kW | 3–8 years |
450–900 mm | 80 °C (Standard) 280 °C (High-temp) | Carbon Steel / SS304 | 24–48 rpm | ISO 9001 |
350–700 mm | 5–45 m³/h | 6–8 vanes | 25–45 Nm | ≤ 1% leakage |
300–650 mm | ≥ 95% | Graphite / PTFE | 65–380 kg | IP54–IP55 |
200×200 to 500×500 mm | ≤ 300 Pa | 45# Steel / SS304 | 8–16 holes Ø14–Ø18 mm | 12–24 months |
(BCD): 160–450 mm | : ≤ 2,000 kg/h | Epoxy / Polyurethane | Every 800–1,200 h | 200,000+ |
Inlet Ø: 180–480 mm | ≤ 10 mm | 6–12 mm | 2 pcs | EN 15089 |
Outlet Ø: 180–480 mm | 1.2 t/m³ | Heavy-Duty Rollers | ≤ 65 dB(A) | C2–C4 |
YJD-A-Square Unloader Installation Method
Preparation: Ensure both upper (inlet) and lower (outlet) flanges align with the unloader’s interface.
Positioning: Mount the unloader using bolts on a flat surface.
Connection: Attach it between the airlock or hopper and conveying line.
Electrical Connection: Connect power to the drive motor according to the specified voltage.
Testing: Rotate manually before running to confirm free movement.
Final Check: Tighten bolts, seal surfaces, and ensure there’s no air leakage before operation.
YJD-A-Square Unloader Material Properties
Component | Material Type | Features |
Housing | Cast iron / Carbon steel / Stainless steel | Strong, impact-resistant, corrosion-resistant |
Rotor | High-strength steel | Smooth feeding, wear-resistant |
Shaft | Alloy steel | High torque tolerance |
Sealing | Rubber or Fluorine rubber | Airtight, prevents leakage |
Bearings | Imported precision bearings | Long lifespan, low noise |
Motor & Gearbox | Compact high-efficiency setup | Reliable rotational performance |
How It Works – Working Mechanism
The YJD-A Square Unloader operates through a rotating impeller (rotor) that captures material from the upper hopper and discharges it into the lower system. As the rotor turns, each chamber delivers a measured volume of material. The close-fitting vanes maintain airlock conditions, preventing air exchange between upstream and downstream systems.
This mechanism provides:
Continuous feeding, ensuring smooth system operation.
Sealing efficiency, minimizing contamination and leakage.
Precise dosing, preventing process fluctuation.
Why It’s Important to Invest in YJD-A Square Unloader
Investing in a Senotay-manufactured YJD-A-Square unloader ensures:
System Stability: Eliminates uneven feeding and pressure imbalance.
Energy Efficiency: Reduces losses from air leakage.
Reduced Maintenance: High-quality materials extend operational life.
Cost-Effectiveness: Improved process performance and minimized downtime.
Technical Advantages in Manufacturing by Senotay
Senotay (Hebei OuTai Environmental Protection Equipment Co., Ltd.) stands as an industry leader offering advanced design precision, strict quality control, and material optimization in each YJD-A unloader.
Advantages include:
CNC-based precision machining for perfect rotor-housing clearance.
Advanced casting and balancing technology.
High-strength, anti-corrosive coatings for harsh industrial conditions.
ISO, CE-compliant manufacturing system.
Custom-made variations for specific feeding capacities and materials.
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FAQs
Q1: What materials can the YJD-A unloader handle?
Answers: It is suitable for all dry powders, granules, and fine particulate materials like cement, grain, and fly ash.
Q2: Can I customize the unloader’s size or material?
Answers: Yes. Senotay offers fully customizable designs in size, capacity, and material composition.
Q3: Does the YJD-A unloader support high-temperature materials?
Answers: Yes, high-temperature versions are available for continuous operation under up to 250°C (optional higher models).
Q4: How often is maintenance required?
Answers: Regular oiling and seal inspection every 6–12 months ensure optimal performance.
Q5: Is it compliant with international standards?
Answers: All Senotay unloaders comply with CE/ISO industrial standards and environmental regulations.
