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FRFV Rotary Seal Feed Ceramic Valve - China Suppliers & Factory for High-Performance Backflow Prevention
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.
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 ≤ 0.1 mmg/cm²/day: Can be ignored or has no corrosion, recommended for use.
B = 0.1~0.3 mmg/cm²/day: Slight or very minor corrosion, use with caution.
C ≥ 0.3 mmg/cm²/day: Significant corrosion, not recommended for use.
-- : Intense corrosion, to the extent that measurement is not possible.
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
- Used for pressure-fed titanium dioxide powder discharge valves, organic silicon powder conveying valves, and similar applications.
Frequently Asked Questions
Q
What makes Y-TZP (Yttria-stabilized Zirconia) ceramic a superior choice for ball valve cores?
Y-TZP ceramic offers an outstanding combination of high fracture toughness (10–12 MPa√m), excellent flexural strength (1150 MPa), and superior hardness (87 HRA), along with near-zero water absorption and excellent corrosion resistance. These properties make it ideal for demanding industrial valve applications involving abrasive slurries and corrosive media.
Q
Which ceramic material is recommended for high-temperature applications above 1200°C?
For applications requiring operating temperatures above 1200°C, 99 Al₂O₃ (alumina), Si₃N₄ (silicon nitride), and SiC (silicon carbide) are all rated for use up to 1500°C. Si₃N₄ additionally provides superior thermal shock resistance (up to 200°C differential), making it particularly suitable for environments with rapid temperature changes.
Q
How does the corrosion resistance of ZrO₂ compare to stainless steel (SS304/SS316) in acid media?
ZrO₂ (Zirconia) demonstrates significantly superior corrosion resistance compared to SS304 and SS316 in most acid environments. In 20% HCL, 90% H₂SO₄, 60% H₃PO₄, and 60% HNO₃ at both 60°C and 95°C, ZrO₂ consistently achieves an "A" rating (≤0.1 mmg/cm²/day), while SS304 and SS316 often receive "C" ratings indicating significant corrosion.
Q
What is the difference between O-type and V-type ceramic ball cores in terms of flow capacity?
The O-type ball core provides the highest flow capacity (Cv value) for a given pipe size, as it allows full-bore flow. V-type cores (V60°, V45°, V30°) offer progressively reduced flow capacities and are designed for precise flow control and throttling applications. For example, at DN100, the O-type core has a Cv of 456, while V60°, V45°, and V30° offer 289, 192, and 128 respectively.
Q
Is ceramic ball valve suitable for handling hydrofluoric acid (HF)?
For HF service, SiC (silicon carbide) is the most recommended ceramic material, achieving an "A" rating in both 10% HF at 60°C and 46% HF at 95°C. ZrO₂ and Al₂O₃ are not recommended for HF service as they receive "C" ratings, indicating significant corrosion. PTFE and Fluororubber components also perform well in HF environments.
Q
What are the typical industrial applications for ceramic ball valves?
Ceramic ball valves are widely used in industries where conventional metal valves fail prematurely. Typical applications include pressure-fed titanium dioxide (TiO₂) powder discharge systems, organic silicon powder conveying lines, chemical processing with strong acids or alkalis, mining and mineral slurry transport, power generation with coal ash handling, and pharmaceutical or food-grade processes requiring zero contamination.