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China ESFV Rotary Star Feed Ceramic Valve Suppliers | Precision Powder Discharge Factory
Performance Characteristics
- 🏺 Fully Ceramic-Lined All internal surfaces in contact with the material are lined with alumina ceramic, providing excellent wear and corrosion resistance while preventing metal contamination. Critical components include the rotor and valve body lining.
- ✅ Clean and Non-Polluting Suitable for applications requiring contamination-free handling of powders or fine particles.
- 🎛️ Precise Adjustment & Backflow Prevention Rotor design ensures smooth and controlled feeding, effectively preventing backflow.
- ⚙️ Versatile Feeding Solution Ideal for use as a metered feeding device in air-flow mills, mechanical crushers, ball mills, vibration mills, stirred mills, and other powder-handling equipment. Can also function as a discharge device at the outlet.
Main Technical Parameters
| Item | Y-ZrO Y-TZP | Mg-ZrO₂ M-PSZ | 90 Al₂O₃ | 95 Al₂O₃ | 99 Al₂O₃ | Si₃N₄ | SiC | Common ceramics | Carbide alloy | 45# Steel |
Density g/cm³ |
6.0~6.05 | 5.72~5.74 | 3.45~3.55 | 3.6~3.75 | 3.9~3.95 | 3.2~3.33 | 3.15~3.25 | 3.0~3.5 | 14~18 | 7.8 |
Hardness HRA/C |
87 | 85 | 90 | 90 | 92 | 92 | 94 | 50~60 | 70 | 36 |
Flexural Strength MPa |
1150 | 900 | 350 | 370 | 450 | 1200 | 470 | 20~50 | 2000 | 804 |
Fracture Toughness (KIC) MPa√m |
10~12 | 13~15 | 3.4 | 3.6 | 4.5 | 7 | 4 | -- | 20 | 101 |
Compressive Strength MPa |
2000 | 1800 | 1700 | 2000 | 2200 | 2800 | -- | -- | 4000 | 2000 |
Thermal Shock Resistance °C |
87 | 110 | -- | -- | 50 | 200 | 75 | -- | 500 | 500 |
Thermal Expansion Coefficient ×10⁻⁶/°C |
9.6 | 10 | 7.6 | 7.8 | 8.3 | 3.4 | 4 | -- | 7 | 12 |
Modulus of Elasticity GPa |
200 | 200 | 310 | 330 | 350 | 300 | 400 | -- | 600 | -- |
Crushing Load KN (Φ6mm) |
15 | 10 | 3.5 | 3.6 | 4 | 18 | 3.5 | -- | -- | -- |
Using Temperature °C |
<160 | <1000 | <1200 | <1250 | <1500 | <1500 | <1500 | -- | -- | <560 |
Water Absorption |
0 | 0 | 0.02% | 0.01% | 0.00% | 0 | 0.50% | 5~10% | -- | -- |
Corrosion Prevention |
Good | Good | Good | Good | Good | Good | Good | Flooey | Good | Flooey |
*Data sources: test results or issued original documents.
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ANTI-CORROSIVE PERFORMANCE REFERENCE TABLE
| Media | Temperature | ZrO₂ | 99.9% Al₂O₃ | SiC | Si₃N₄ | Graphite | PTFE | Fluororubber | SS304 | SS316 | HC |
| 20% HCL | 60°C | A | A | A | B | A | A | A | C | C | B |
| 20% HCL | 95°C | A | A | A | C | A | A | A | -- | -- | C |
| 90% H₂SO₄ | 60°C | A | A | A | A | A | A | A | C | C | B |
| 90% H₂SO₄ | 95°C | A | A | A | B | A | A | A | C | C | C |
| 60% H₃PO₄ | 60°C | A | A | A | C | A | A | A | C | C | A |
| 60% H₃PO₄ | 95°C | A | A | A | C | A | A | A | C | C | A |
| 10% HF | 60°C | C | B | A | A | A | A | A | C | C | B |
| 46% HF | 95°C | C | C | A | C | A | A | A | -- | -- | C |
| 60% HNO₃ | 60°C | A | A | A | C | B | A | A | A | A | C |
| 60% HNO₃ | 95°C | A | B | A | C | B | A | A | B | B | C |
| 30% NaOH | 60°C | A | B | A | B | A | A | A | A | A | A |
| 30% NaOH | 95°C | B | B | A | C | A | A | A | A | B | A |
A ≤ 0.1mmg/cm²/day: Can be ignored or has no corrosion, recommended for use.
B = 0.1~0.3mmg/cm²/day: Slight or very minor corrosion, use with caution.
C ≥ 0.3mmg/cm²/day: Significant corrosion, not recommended for use.
-- Intense corrosion, to the extent that measurement is not possible.
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Flow Characteristic Sheet of Ceramic Ball Valve
| Core Specifications | O-type ball core | V60° ball core | V45° ball core | V30° ball core |
| DN15 | 10 | 7 | 4 | 3 |
| DN20 | 18.2 | 12 | 8 | 5 |
| DN25 | 29 | 18 | 12 | 8 |
| DN32 | 47 | 30 | 20 | 13 |
| DN40 | 73 | 46 | 31 | 21 |
| DN50 | 114 | 72 | 48 | 32 |
| DN65 | 181 | 115 | 76 | 51 |
| DN80 | 292 | 185 | 123 | 82 |
| DN100 | 456 | 289 | 192 | 128 |
| DN125 | 712 | 452 | 300 | 201 |
| DN150 | 1025 | 650 | 432 | 289 |
| DN200 | 1822 | 1156 | 769 | 514 |
Typical Applications
- 🔋 Battery powder discharge valves
- 🧪 Chemical powders and fine particle handling in high-tech material processing
- ⚙️ Feeding devices for various powder processing mills and equipment
❓ Frequently Asked Questions
Q What materials are used for the internal lining of the ceramic-lined rotary valve?
All internal surfaces in contact with the material are lined with alumina ceramic. Critical components including the rotor and valve body lining are fully ceramic-lined to ensure excellent wear resistance, corrosion resistance, and zero metal contamination.
Q Which ceramic material offers the highest hardness and wear resistance?
SiC (Silicon Carbide) achieves the highest hardness at HRA 94 among the listed ceramics, while Si₃N₄ offers the highest flexural strength at 1200 MPa. For combined wear and toughness performance, Y-TZP zirconia (13~15 MPa√m fracture toughness) is often preferred.
Q Is the ceramic-lined valve suitable for handling highly corrosive chemicals such as HCL and H₂SO₄?
Yes. ZrO₂ and 99.9% Al₂O₃ ceramics both achieve an "A" rating (≤ 0.1mmg/cm²/day) against 20% HCL and 90% H₂SO₄ at temperatures up to 95°C, making them highly recommended for corrosive chemical environments. Note that ZrO₂ is not suitable for HF-containing media.
Q What types of powder processing equipment is this valve compatible with?
The ceramic-lined rotary valve is compatible with a wide range of powder processing equipment including air-flow mills, mechanical crushers, ball mills, vibration mills, and stirred mills. It can serve both as a metered feeding device and as a discharge device at the outlet.
Q What are the available ball core types and how do they affect flow characteristics?
Four ball core types are available: O-type, V60°, V45°, and V30°. The O-type provides the highest flow capacity (e.g., 1822 Kv for DN200), while V30° offers the most precise flow control with reduced flow rates. The V-type cores are ideal for throttling and proportional control applications.
Q What industries typically use ceramic-lined rotary valves?
Ceramic-lined rotary valves are widely used in battery manufacturing (powder discharge), chemical processing, high-tech material processing, pharmaceutical powder handling, and mineral processing industries — anywhere contamination-free, wear-resistant, and corrosion-resistant powder flow control is required.