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FXZV Ceramic Downward Discharge Valve - High-Performance Solution by China Suppliers and Factory
★ 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 — No or negligible corrosion, recommended for use
B
0.1~0.3 mmg/cm²/day — Slight corrosion, use with caution
C
≥ 0.3 mmg/cm²/day — Significant corrosion, not recommended
--
Intense corrosion — measurement 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 are the key differences between Y-TZP and M-PSZ zirconia ceramic materials?
Y-TZP (Yttria-stabilized Tetragonal Zirconia Polycrystal) offers higher density (6.0~6.05 g/cm³), higher flexural strength (1150 MPa), and excellent hardness (87 HRA), making it ideal for precision wear-resistant applications. M-PSZ (Magnesia Partially Stabilized Zirconia) has a slightly lower density (5.72~5.74 g/cm³) but superior fracture toughness (13~15 MPa√m) and better thermal shock resistance (110°C), making it more suitable for applications involving thermal cycling.
Q
Which ceramic material offers the best corrosion resistance against strong acids?
ZrO₂ (Zirconia), 99.9% Al₂O₃ (Alumina), SiC (Silicon Carbide), Graphite, PTFE, and Fluororubber all demonstrate excellent (Grade A) resistance to most strong acids such as HCl, H₂SO₄, H₃PO₄, and HNO₃. However, ZrO₂ and Al₂O₃ show poor resistance (Grade C) to HF (hydrofluoric acid), while SiC maintains Grade A resistance even against HF, making it the top choice for HF environments.
Q
What is the maximum operating temperature for different ceramic materials?
99 Al₂O₃, Si₃N₄, and SiC all support operating temperatures up to 1500°C, making them suitable for high-temperature industrial applications. 95 Al₂O₃ can be used up to 1250°C, and 90 Al₂O₃ up to 1200°C. In contrast, Y-TZP zirconia is limited to below 160°C for the Y-ZrO variant, while M-PSZ can reach up to 1000°C. 45# Steel is limited to below 560°C.
Q
How does the flow coefficient (Cv) vary between different ceramic ball valve core types?
The O-type ball core provides the highest flow coefficient across all pipe sizes, offering full-bore flow capacity. V-notch cores (V60°, V45°, V30°) progressively reduce the flow coefficient, providing precise flow control. For example, at DN100, the O-type core delivers a Cv of 456, while the V30° core delivers 128 — approximately 72% less — enabling fine proportional control for demanding process applications.
Q
Why is Si₃N₄ not recommended for use with HF or NaOH at elevated temperatures?
Si₃N₄ (Silicon Nitride) shows Grade C or worse corrosion resistance when exposed to HF (both 10% at 60°C and 46% at 95°C) and 30% NaOH at 95°C. This is because both hydrofluoric acid and strong alkalis can chemically attack the silicon nitride matrix, breaking down the grain boundary phases and leading to significant material degradation. For these environments, SiC or PTFE-lined alternatives are strongly recommended.
Q
How does the compressive strength of advanced ceramics compare to 45# steel and carbide alloy?
Advanced ceramics are highly competitive in compressive strength. Si₃N₄ reaches 2800 MPa, while 99 Al₂O₃ achieves 2200 MPa — both exceeding 45# steel (2000 MPa) in compressive performance. Carbide alloy leads with 4000 MPa. However, ceramics significantly outperform steel in hardness, wear resistance, and corrosion resistance, making them the preferred choice for harsh industrial environments where combined mechanical and chemical resistance is required.