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China FRFV Rotary Seal Feed Ceramic Valve - Leading Suppliers & Factory for High-Performance Solutions
Main Technical Parameters
| Item | Y-ZrO₂ 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 |
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 are the main differences between Y-TZP and M-PSZ zirconia ceramics in terms of mechanical properties?
Y-TZP (Yttria-stabilized Tetragonal Zirconia Polycrystal) offers a higher flexural strength of 1150 MPa and fracture toughness of 10–12 MPa√m, while M-PSZ (Magnesia Partially Stabilized Zirconia) provides superior fracture toughness of 13–15 MPa√m with a slightly lower flexural strength of 900 MPa. Both exhibit excellent corrosion resistance, making them suitable for demanding industrial environments.
Q
Which ceramic material is best suited for high-temperature applications above 1200°C?
For applications requiring operating temperatures above 1200°C, 99 Al₂O₃, Si₃N₄, and SiC are the most suitable choices, as all three support continuous use up to 1500°C. Si₃N₄ also offers outstanding thermal shock resistance of 200°C, making it particularly advantageous in environments with rapid temperature fluctuations.
Q
How does the corrosion resistance of ZrO₂ compare to stainless steel (SS304/SS316) in acidic media?
ZrO₂ demonstrates significantly superior corrosion resistance compared to SS304 and SS316 in most acidic media. In tests with 20% HCl, 90% H₂SO₄, 60% H₃PO₄, and 60% HNO₃, ZrO₂ consistently achieves an "A" rating (≤ 0.1 mmg/cm²/day), while SS304 and SS316 often receive "C" ratings or are unmeasurable ("--") due to intense corrosion. The exception is hydrofluoric acid (HF), where ZrO₂ is not recommended.
Q
What does the flow characteristic data indicate for selecting the right ceramic ball valve core type?
The flow characteristic sheet shows the flow coefficient (Cv) for each core type across different pipe sizes (DN15–DN200). The O-type ball core provides the highest flow capacity, while V30° offers the lowest, enabling precise throttling control. For example, at DN100, the O-type core has a Cv of 456 compared to 128 for the V30° core. Selecting the appropriate V-notch angle allows engineers to tailor flow control characteristics for specific process requirements.
Q
Why is SiC ceramic particularly recommended for hydrofluoric acid (HF) environments?
Silicon Carbide (SiC) is one of the few materials that achieves an "A" rating in both 10% HF at 60°C and 46% HF at 95°C. Most other materials, including ZrO₂, Al₂O₃, and stainless steels, show significant or unmeasurable corrosion in concentrated HF at elevated temperatures. SiC's exceptional chemical stability, combined with its high hardness (HRA 94) and compressive strength (up to 470 MPa flexural), makes it the preferred choice for HF-containing process environments.
Q
What are the typical industrial applications of ceramic ball valves using these advanced ceramic materials?
Ceramic ball valves utilizing these advanced materials are widely used in industries handling highly abrasive, corrosive, or high-temperature media. Typical applications include pressure-fed titanium dioxide (TiO₂) powder discharge valves, organic silicon powder conveying systems, chemical processing lines with strong acids or alkalis, slurry transport in mining and metallurgy, and high-purity fluid control in pharmaceutical and semiconductor manufacturing.