The Rotary Valve: A Precision Gatekeeper for Industry
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.
What Is a YJD-A-Square Unloader?
The YJD-A-Square Unloader is a specialized rotary feeder designed to discharge materials from hoppers, silos, dust collectors and cyclone separators while maintaining controlled and continuous flow.
Its square flange design ensures easy installation, perfect sealing, and compatibility with a wide range of industrial systems.
It is primarily used for:
· Air-locking.
· Metered feeding.
· Preventing air leakage.
· Stable dust and powder discharge.
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.
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.
