The YJD-B-Square Rotary Valve Unloader is a motor-driven feeder designed for efficient material handling. It features a square housing that prevents material buildup, making it ideal for discharging powders, granules, and pellets from silos, hoppers, or dust collectors. It consistently meters material flow while acting as an airlock to maintain pressure or vacuum in systems like pneumatic conveyors.
A rotary valve is a fundamental mechanical device used to control the flow of dry, bulk materials like powder, granules, or pellets. Its primary role is to function as a precision gatekeeper, consistently discharging a set amount of material from one chamber to another.
More importantly, it acts as an airlock seal. This allows it to maintain a critical pressure difference between two areas, such as between a pressurized pneumatic conveyor system and a storage tank at normal atmospheric pressure. By doing so, it enables material to flow through without letting the valuable pressure escape, making it an indispensable component in industries ranging from plastics and food processing to pharmaceuticals and chemical manufacturing.
The YJD-B Square Unloader which is also known as the YJD-B Rotary Feeder or Rotary Airlock Valve that is a precision-engineered device designed for controlled discharge of dry powders and granular materials from hoppers, silos and dust collectors. As one of the flagship products of Hebei OuTai Environmental Protection Equipment Co., Ltd. . it also ensures airtight material transfer and consistent feeding performance in pneumatic conveying systems.
With its robust square body, advanced sealing structure and uniform rotary discharge system, the YJD-B Square Unloader enhances process stability, improves energy efficiency and extends equipment lifespan in industrial applications worldwide.
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 |
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.
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) | 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 |
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.
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 | 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 |
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 |
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.
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.
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.
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
