High-Tightness Rotary Airlock & Continuous Metered Powder Discharge
The YJD-B Square Rotary Feeder (Rotary Airlock Valve) is a precision-machined volumetric discharge valve engineered to extract dry powders, pellets, and bulk granules from hoppers, silos, and industrial dust collectors. Featuring an enhanced multi-vane rotor assembly that achieves a tight gas leakage rate of under 0.5%, it provides continuous metered feeding while maintaining a reliable differential pressure boundary from -0.03 to +0.10 MPa. Available in cast iron, carbon steel, and food-grade stainless steel grades across 10 stepped model sizes, it prevents pressure loss in pneumatic conveying systems and eliminates fugitive dust escape.
Featured Model Variants
YJD-B-1 | Small Collector & Bin Vent Line
Inlet Size: 150×150 mm | Capacity: 2–5 m³/h | Power: 0.75 kW | Material: Cast Iron
Designed for compact baghouses, bin vents, and small hopper discharge points.
YJD-B-10 | High-Capacity Bulk Unloader
Inlet Size: 400×400 mm | Capacity: 30–50 m³/h | Power: 3.0–4.0 kW | Material: Cast Iron / Steel
High-throughput rotary airlock built for industrial silos, mining lines, and cement terminals.
Key Technical Specifications
Volumetric Flow & Sizing: Throughputs from 2 to 50 m³/h across square flange profiles ranging from 150×150 mm to 400×400 mm (up to 600×600 mm custom).
Operating Pressure & Speeds: Holds pressure differentials from -0.03 to +0.10 MPa at controlled rotor speeds of 18–30 rpm (adjustable 10–60 rpm).
Drive & Enclosure Ratings: Driven by 0.75 kW to 4.0 kW gear motors with IP54/IP55 enclosure ratings, heavy-duty roller bearings, and noise levels under 65 dB(A).
Why Choose the YJD-B Rotary Feeder?
Enhanced Airlock Precision: Features a tighter leakage tolerance of just 0.5% (outperforming the YJD-A series) while maintaining a reliable airlock seal above 95%.
Exact Capacity Matching: Ten sub-models offer finer capacity increments from 2 to 50 cubic meters per hour, allowing you to match your exact throughput without having to round up to a larger size.
Built-in Material Options: Readily available in SS304 and SS316 stainless steel for handling corrosive powders in chemical and pharmaceutical plants, alongside rugged cast iron for abrasive dust.
Dependable Gatekeeping: Acts as a precision valve to consistently discharge dry, bulk materials while maintaining critical pressure differences between upstream and downstream systems.
Tailored Construction: Rotor material, vane count, and body type are customized to match your material's specific corrosiveness and dosing precision requirements.
Why Leading Plants Choose SENOTAY YJD-B Rotary Feeder
Factory-Direct Pricing. Certified Quality. Dedicated Support.
Best Price Guarantee
Certified & Compliant
Fast, Reliable Delivery
Types of YJD-B Square Unloader (Comprehensive Analysis Table)
Type No. | Inlet Size (mm) | Capacity (m³/h) | Motor Power (kW) | Rotor Speed (rpm) | Body Material | Application Suitability |
YJD-B-1 | 150×150 | 2–5 | 0.75 | 20–25 | Cast Iron | Dust collectors |
YJD-B-2 | 180×180 | 5–8 | 0.75–1.1 | 20–25 | Cast Iron | Cement, lime |
YJD-B-3 | 200×200 | 6–10 | 1.1 | 20–28 | Carbon Steel | Chemical powders |
YJD-B-4 | 220×220 | 8–15 | 1.1–1.5 | 20–30 | Cast Iron | Grain & feed |
YJD-B-5 | 240×240 | 10–18 | 1.5 | 22–30 | Stainless Steel | Food-grade |
YJD-B-6 | 260×260 | 12–20 | 1.5–2.2 | 22–28 | Cast Iron | Abrasive dust |
YJD-B-7 | 300×300 | 18–28 | 2.2 | 20–26 | Carbon Steel | Bulk materials |
YJD-B-8 | 320×320 | 20–32 | 2.2–3.0 | 20–25 | Cast Iron | Large dust systems |
YJD-B-9 | 350×350 | 25–40 | 3.0 | 20–22 | SS304/316 | Corrosive powders |
YJD-B-10 | 400×400 | 30–50 | 3.0–4.0 | 18–22 | Cast Iron | High-capacity lines |
Product Description
Senotay’s YJD-B Square Unloader is built with:
Thickened cast iron or steel housing for exceptional structural rigidity.
High-precision machined rotor for stable rotation.
Rotor blades with minimal clearance to reduce air leakage.
Heavy-duty rotary actuator or geared motor for consistent torque output.
Corrosion-resistant surface treatments.
Optimized square flange for easy installation with dust collectors and silos.
Designed for long-term reliability, the unit operates smoothly under high temperatures, continuous loads, and abrasive material conditions.
YJD-B Square Unloader — Technical Specification Table
Physical Dimensions | Performance Ratings | Material & Construction | Operational Data | Certifications & Lifecycle |
Model Size: 200–600 mm | -0.03 to +0.10 MPa | Cast Iron HT250 / SS304 | 0.55–4.0 kW | 3–10 years |
Length: 480–1,050 mm | 80 °C (Standard)
280 °C (High Temp) | 45# Steel / SS304 | 20–48 rpm | ISO 9001 |
Width: 380–780 mm | Airlock: ≥ 95% | 6–10 vanes | 30–55 Nm | ≤ 0.5% leakage |
Height: 330–720 mm | 6–55 m³/h | PTFE / Graphite | 75–450 kg | IP54–IP55 |
Square Flang: 200×200–600×600 mm | ressure: ≤ 320 Pa | 45# Steel / SS304 | 8–20 holes Ø14–Ø20 mm | 12–24 months |
(BCD): 165–510 mm | Density: 1.4 t/m³ | Epoxy / Polyurethane | 800–1,200 h | 250,000+ |
Inlet Opening: 190–580 mm | Particle: ≤ 12 mm | 6–14 mm | 2–4 pcs | EN 15089 |
Outlet Opening: 190–580 mm | 15–50 rpm | Heavy-Duty Roller Bearings | ≤ 65 dB(A) | C2–C4 |
Core Components
The YJD-B Rotary Feeder consists of:
Square upper flange.
Cast iron or carbon-steel valve body.
Rotor with welded blades.
End covers (bearing housings).
Sealing systems (packing or mechanical seals).
Gear reducer motor or rotary actuator.
Steel shaft with high load capacity.
Inspection ports (optional).
Each part is engineered to maximize durability, accuracy, and airlock performance.
YJD-B Square Unloader Installation Method
Align the square flange with the discharge port of hopper or dust collector.
Use high-strength bolts to securely fasten the unit.
Ensure correct horizontal and vertical alignment to avoid rotor friction.
Connect the electrical power to the geared motor according to standards.
Install a parallel expansion joint if connecting to a pneumatic conveying pipeline.
Check for proper rotation direction before operation.
Perform a trial run to ensure smooth, vibration-free performance.
Correct installation ensures maximum service life and airlock efficiency.
Material Properties of YJD-B Square Unloader
Material | Description | Advantages |
Cast Iron | Strong rigidity and wear resistance | Ideal for heavy-duty applications |
Carbon Steel | Cost-effective, high mechanical strength | Suitable for general usage |
Stainless Steel | Corrosion-resistant and hygienic | For food, chemical, and clean industries |
Alloy Steel | Enhanced mechanical and thermal strength | Suitable for harsh environments |
Rubber Seal | Tight airlock seal | Durable under high temperature |
Standard Physical & Mechanical Properties
Property | Description | Standard Value |
Temperature Range | Applicable to hot and cold materials | -20°C to 250°C |
Air Pressure | Airtight operation pressure | ≤ 0.1 MPa |
Speed Range | Rotor revolution | 10–60 rpm |
Volume Capacity | Material throughput | 1–60 m³/h |
Motor Power | Depends on model | 0.75–7.5 kW |
Density Range | For dry powders & granules | ≤ 2.5 g/cm³ |
Lifespan | Under standard conditions | ≥ 50,000 hours |
Industrial Applications of YJD-B Square Unloader
The YJD-B Rotary Feeder is widely used in:
Cement plants.
Asphalt mixing plants.
Grain processing.
Mining and metallurgy.
Food processing.
Flour and feed mills.
Chemical and petrochemical plants.
Dust collection systems.
Power stations and biomass plants.
Pneumatic conveying lines.
How It Works – Working Mechanism
Material enters the square inlet and fills the rotor compartments.
The rotor turns at a controlled speed, carrying the material to the discharge section.
The design maintains an air-tight seal, preventing reverse airflow.
Material is continuously discharged into the next process.
This mechanism ensures stable feeding, accurate dosing, and efficient dust control.
Technical Advantages in Manufacturing by Senotay (Hebei OuTai Environmental Protection Equipment Co., Ltd.)
Senotay provides unmatched advantages:
20+ years manufacturing experience.
CNC machining for ultra-tight tolerances.
Custom materials and coatings.
High-efficiency motors and reducers.
Thorough quality inspections and test runs.
OEM/ODM design capability.
Compliance with international industrial standards.
These capabilities ensure that each YJD-B Square Unloader delivers superior performance and reliability.
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FAQs
Q1. What materials can the YJD-B Square Unloader handle?
Answers:A wide range of powders, granules, and dust—from cement to food-grade materials.
2. Can it be used in high-temperature applications?
Answers:Yes, with customized heat-resistant materials, it can operate up to 250°C.
3. Does it prevent air leakage?
Answers:Absolutely. Precision machining ensures a tight airlock seal.
4. Can Senotay customize the unloader?
Answers:Yes—sizes, materials, motors, and coatings can be customized.
5. What industries use the YJD-B Rotary Feeder?
Answers:Cement, chemical, food, grain, mining, environmental protection
