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China Ceramic Wheel Valve Suppliers - High Durability Factory-Produced Valves with No Metal Contact
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 | Fluoro-rubber | 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 |
Frequently Asked Questions (FAQ)
Q
What is the difference between Y-TZP (Y-ZrO₂) and M-PSZ (Mg-ZrO₂) zirconia ceramics?
Y-TZP (Yttria-stabilized Tetragonal Zirconia Polycrystal) offers higher density (6.0~6.05 g/cm³) and superior flexural strength (1150 MPa), making it ideal for precision components requiring high mechanical performance. M-PSZ (Magnesia Partially Stabilized Zirconia) provides better fracture toughness (13~15 MPa√m) and higher thermal shock resistance (110°C), making it more suitable for applications involving thermal cycling.
Q
Which ceramic material has the best corrosion resistance against hydrofluoric acid (HF)?
SiC (Silicon Carbide) demonstrates the best resistance to hydrofluoric acid (HF) at both 10% and 46% concentrations, achieving a Grade A rating at all tested temperatures. ZrO₂ and 99.9% Al₂O₃ are rated C (significant corrosion) when exposed to HF, and are therefore not recommended for HF environments. Si₃N₄ also performs well at lower HF concentrations (Grade A at 10% HF / 60°C).
Q
What does the flow coefficient (Cv) value represent in the ceramic ball valve flow characteristic sheet?
The flow coefficient (Cv) represents the volume of water (in US gallons per minute) that flows through the valve at a pressure drop of 1 psi. Higher Cv values indicate greater flow capacity. As shown in the table, the O-type ball core consistently provides the highest Cv values across all pipe sizes, while the V30° ball core offers the most precise flow control with the lowest Cv values, making it suitable for throttling applications.
Q
Why is 99 Al₂O₃ preferred over 90 Al₂O₃ or 95 Al₂O₃ in high-temperature applications?
99 Al₂O₃ (99% alumina) offers a higher maximum operating temperature of up to 1500°C compared to 1200°C for 90 Al₂O₃ and 1250°C for 95 Al₂O₃. It also provides higher hardness (HRA 92), better compressive strength (2200 MPa), and virtually zero water absorption (0.00%), making it the preferred choice for demanding high-temperature, high-purity, or chemically aggressive environments.
Q
How do ceramic materials compare to carbide alloy and 45# steel in terms of mechanical strength?
Carbide alloy leads in compressive strength (4000 MPa) and modulus of elasticity (600 GPa), making it extremely rigid. However, advanced ceramics such as Si₃N₄ (flexural strength 1200 MPa) and Y-TZP zirconia (1150 MPa) exceed 45# steel (804 MPa) in flexural strength. Ceramics also offer far superior hardness (HRA 87–94) compared to 45# steel (HRC 36), and significantly better corrosion resistance, particularly in acidic and alkaline environments where steel fails.
Q
Which V-port ball core type should I choose for precise flow regulation in a ceramic ball valve?
For precise flow regulation, a V30° ball core is recommended as it provides the lowest Cv values and the finest control over flow rate. For moderate control with higher flow capacity, the V45° or V60° ball core offers a balanced solution. If full-bore, unrestricted flow is required without throttling, the O-type ball core delivers the maximum Cv and is best suited for on/off service applications.