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China FXZV Ceramic Downward Discharge Valve - Reliable Suppliers and 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 |
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 |
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Frequently Asked Questions
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), superior flexural strength (1150 MPa), and excellent fracture toughness (10~12 MPa√m), making it ideal for high-stress applications. M-PSZ (Magnesia Partially Stabilized Zirconia) has a slightly lower density (5.72~5.74 g/cm³) but provides better fracture toughness (13~15 MPa√m) and thermal shock resistance (110°C), which is advantageous in environments with rapid temperature changes.
Q
Which ceramic material is best suited for high-temperature applications?
For high-temperature applications, 99 Al₂O₃, Si₃N₄, and SiC are the top choices, each supporting operating temperatures up to 1500°C. Si₃N₄ also offers excellent thermal shock resistance (200°C) and high compressive strength (2800 MPa), making it particularly well-suited for demanding thermal environments.
Q
How does ZrO₂ perform in corrosive media compared to stainless steel?
ZrO₂ significantly outperforms stainless steel (SS304 and SS316) in most corrosive media. It achieves an "A" rating (≤0.1 mmg/cm²/day — no significant corrosion) in HCL, H₂SO₄, H₃PO₄, and HNO₃ environments, while SS304 and SS316 typically receive "C" ratings (significant corrosion) or even "--" (immeasurable corrosion). Note that ZrO₂ is not recommended for use in HF (hydrofluoric acid) environments.
Q
What do the O-type, V60°, V45°, and V30° ball core types mean for flow control?
The ball core type determines the flow coefficient (Cv) of the ceramic ball valve. The O-type ball core provides the largest flow capacity and is used for full-bore, on/off control. V-notch ball cores (V60°, V45°, V30°) are designed for precise flow regulation — the smaller the angle, the lower the flow coefficient and the finer the control. For example, at DN50, the O-type delivers a Cv of 114, while the V30° core provides only 32, allowing much more precise throttling.
Q
Why is SiC (Silicon Carbide) preferred for hydrofluoric acid (HF) applications?
SiC achieves an "A" rating in both 10% HF at 60°C and 46% HF at 95°C, demonstrating exceptional resistance to hydrofluoric acid at high concentrations and temperatures. In contrast, ZrO₂ and 99.9% Al₂O₃ receive a "C" rating in HF environments, meaning they are not suitable. SiC's chemical inertness, combined with its high hardness (HRA 94) and high modulus of elasticity (400 GPa), makes it the preferred material for HF-related processes.
Q
How does the water absorption rate of ceramic materials affect their performance in valve applications?
Low water absorption is critical for valve reliability and longevity. Y-TZP (ZrO₂), M-PSZ, Si₃N₄, and 99 Al₂O₃ all achieve 0% or near-zero water absorption, ensuring dimensional stability, resistance to fluid infiltration, and consistent sealing performance. In contrast, common ceramics can absorb 5~10% water, which can lead to swelling, reduced strength, and compromised sealing — making them unsuitable for precision valve applications.