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FAAV Ceramic A Valve - High-Quality China Suppliers and Factory for Long-Lasting Sealing 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 |
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) ceramic materials?
Y-TZP (Yttria-stabilized Tetragonal Zirconia Polycrystal) offers higher density (6.0~6.05 g/cm³) and excellent flexural strength (1150 MPa), making it ideal for high-load precision applications. M-PSZ (Magnesia-stabilized Partially Stabilized Zirconia) provides superior fracture toughness (13~15 MPa√m) and better thermal shock resistance (110°C), making it more suitable for environments with thermal cycling.
Q
Which ceramic material has the best corrosion resistance against strong acids?
ZrO₂ and 99.9% Al₂O₃ both demonstrate excellent corrosion resistance (Grade A) against most strong acids including HCL, H₂SO₄, H₃PO₄, and HNO₃ at both 60°C and 95°C. However, ZrO₂ and Al₂O₃ are rated C (not recommended) when exposed to HF (hydrofluoric acid). SiC shows the broadest acid resistance, including resistance to HF.
Q
What do the corrosion ratings A, B, and C mean in the anti-corrosive performance table?
The ratings indicate the corrosion rate of the material in a given medium: A (≤ 0.1 mmg/cm²/day) means negligible or no corrosion and is recommended for use; B (0.1~0.3 mmg/cm²/day) indicates slight corrosion and requires caution; C (≥ 0.3 mmg/cm²/day) means significant corrosion and is not recommended; "--" denotes intense corrosion beyond measurable limits.
Q
How do I select the right ball core type (O-type, V60°, V45°, V30°) for my ceramic ball valve?
The O-type ball core provides the largest flow coefficient and is best suited for full-bore on/off control applications. V-type ball cores (V60°, V45°, V30°) are designed for flow regulation and throttling, with a smaller V-angle providing finer flow control. For example, a DN50 O-type core has a flow coefficient of 114, while a V30° core of the same size is only 32, enabling precise modulation of flow rates.
Q
What is the maximum operating temperature for ceramic ball valve materials?
Operating temperature varies by material: 99 Al₂O₃, Si₃N₄, and SiC all support up to 1500°C, making them suitable for high-temperature industrial processes. 95 Al₂O₃ is rated up to 1250°C, while 90 Al₂O₃ handles up to 1200°C. Mg-ZrO₂ (M-PSZ) is rated up to 1000°C, and Y-ZrO₂ (Y-TZP) is limited to below 160°C for continuous service due to phase transformation concerns.
Q
Why is ceramic preferred over stainless steel (SS304/SS316) in corrosive fluid applications?
Ceramic materials such as ZrO₂, Al₂O₃, and SiC consistently achieve Grade A corrosion resistance across a wide range of aggressive media including HCL, H₂SO₄, H₃PO₄, and NaOH, where SS304 and SS316 frequently rate C (significant corrosion) or "--" (immeasurable corrosion). In addition, ceramics offer zero water absorption, superior hardness (HRA 87–94 vs. 36 for 45# steel), and longer service life in abrasive or chemically aggressive environments.