Valve Plate
Heat-resistant steel valve plates for cement plant preheaters and fluidized bed systems. Engineered for high-temperature gas distribution and material flow control. Temperature rating 900-1050 C
Valve Plate
Material Specifications & Selection Guide
| Grade | Standard | Max Temp | Key Feature | Application |
|---|---|---|---|---|
| ZG35Cr24Ni7SiN | GB/T 8492 | 1050 C | Nitrogen-strengthened, high creep & wear resistance | Hot gas valve plates, high-temp flap valves |
| ZG40Cr25Ni12Si2 | GB/T 8492 | 1000 C | Balanced oxidation resistance & thermal fatigue | Diverter valve plates, material flow gates |
| ZG30Cr26Ni5 | GB/T 8492 | 950 C | Good thermal shock resistance, cost-effective | General purpose valve plates, medium-temp zones |
| ZG40Cr25Ni20Si2 | GB/T 8492 | 1050 C | Superior oxidation resistance, high Ni content | Calciner valve plates, tertiary air duct valves |
| ZG30Cr20Ni10 | GB/T 8492 | 900 C | Economical for lower temperature installations | Cooling zone valves, raw mill diverter plates |
| Grade | C (%) | Cr (%) | Ni (%) | Si (%) | Mn (%) | N (%) | P/S Max |
|---|---|---|---|---|---|---|---|
| ZG35Cr24Ni7SiN | 0.30-0.40 | 23.0-26.0 | 6.0-8.0 | 1.30-2.00 | 0.50-1.50 | 0.15-0.25 | 0.040 |
| ZG40Cr25Ni12Si2 | 0.35-0.45 | 24.0-27.0 | 11.0-14.0 | 1.50-2.50 | 0.50-1.50 | – | 0.040 |
| ZG30Cr26Ni5 | 0.25-0.35 | 24.0-28.0 | 4.0-6.0 | 1.00-2.00 | 0.50-1.50 | – | 0.040 |
| ZG40Cr25Ni20Si2 | 0.35-0.45 | 24.0-27.0 | 19.0-22.0 | 1.50-2.50 | 0.50-1.50 | – | 0.040 |
| Grade | Tensile (MPa) | Yield (MPa) | Elong. (%) | Hardness (HBW) | Density |
|---|---|---|---|---|---|
| ZG35Cr24Ni7SiN | 480 | 245 | 8 | 170-220 | 7.75 |
| ZG40Cr25Ni12Si2 | 440 | 220 | 6 | 180-230 | 7.70 |
| ZG30Cr26Ni5 | 450 | 235 | 10 | 170-220 | 7.80 |
| ZG40Cr25Ni20Si2 | 450 | 235 | 8 | 180-240 | 7.75 |
Selection Quick Reference
- Calciner & tertiary air duct valves (950-1050 C): ZG40Cr25Ni20Si2 — maximum oxidation resistance for sustained high-temperature gas exposure
- Preheater diverter & flap valves (850-1000 C): ZG35Cr24Ni7SiN — nitrogen-strengthened for superior wear resistance in abrasive dust-laden gas flows
- Material flow gates & diverter plates (750-950 C): ZG40Cr25Ni12Si2 — balanced performance, standard choice for mid-range temperature valves
- Raw mill diverter & cooling zone (550-900 C): ZG30Cr26Ni5 — cost-effective grade with adequate thermal fatigue resistance
- All grades compatible with FLSmidth, KHD, Polysius, Sinoma valve and gate designs
Certifications & Authorizations
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Custom OEM / ODM
From drawing to delivery — one-stop customization, no minimum order
Send Drawing
Upload your technical drawing (PDF, DWG, STEP, IGES) or share sample photos with dimensions
Engineering Review
Material recommendation, casting process design, DFM analysis — free quotation within 24 hours
Sampling & Test
Prototype production with full inspection: hardness test, spectrometer, dimensional check
Production & Ship
ISO 9001 certified. 15-25 days standard lead time. Global shipping with full documentation
Frequently Asked Questions
ZHILI produces heat-resistant valve plates for high-temperature gas and material flow control throughout the cement production process. Our valve plates cover three main application categories:
- Hot gas diverter valves: Used in preheater gas ducts and tertiary air ducts to distribute hot gas between calciner and raw mill. These plates experience 750-1050 C gas with heavy dust loading.
- Flap / check valves: One-way flow control valves in meal pipes between preheater stages. Must open freely under material weight and close tightly to prevent gas backflow.
- Material flow gates: Slide gate plates controlling raw meal or clinker flow between process stages. Experience direct abrasive material contact at elevated temperatures.
Typical dimensions: Diverter plates from 500×500 mm up to 1500×2000 mm. Flap valves from 200 mm to 800 mm diameter. All custom sizes manufactured to your specifications.
ZHILI manufactures individual valve plates as well as complete valve sub-assemblies. Most customers supply their own actuator and housing, and we provide the heat-resistant internal valve plate with mounting hardware:
- Individual valve plates: Plate only, cast to your drawing with mounting holes, ribbing, and surface finish specifications. This is the most common order type.
- Plate + shaft assembly: Valve plate with integrated shaft, hub, and keyway. Shaft material can be heat-resistant steel or refractory-grade alloy, depending on temperature.
- Complete flap valve assembly: Plate, shaft, counterweight, hinge, and housing mounting bracket. Delivered as a bolt-on replacement unit.
Reverse engineering available: Send us your worn valve plate or assembly. Our 3D laser scanning captures exact geometry including shaft mounting points, counterweight attachments, and pivot bearing seats.
Valve plates in cement plants fail from a combination of thermal, mechanical, and abrasive mechanisms acting simultaneously. Understanding the dominant failure mode in your specific application is key to selecting the right material and design:
- Warping (thermal distortion): The #1 failure mode for large diverter plates. Uneven heating causes the plate to bow, resulting in gas leakage. Use ribbed/reinforced designs and ZG35Cr24Ni7SiN (N-strengthened) for 30-40% better dimensional stability.
- Erosion thinning: Abrasive dust continuously scours the plate surface. High-Cr grades (26-30% Cr) provide 40-50% better erosion resistance. For extreme conditions, we can apply hardfacing overlay to critical wear zones.
- Shaft/hub cracking: The transition from thick hub to thin plate is a stress concentration point. Radius this transition with minimum 8 mm fillet. Use bolt-on replaceable hubs instead of integrally cast design for easier maintenance.
Design recommendation: For large diverter plates (>1000 mm), request a ribbed reinforcement pattern on the non-gas-facing side. This adds only 10-15% weight but increases bending stiffness by 200-300%, dramatically reducing warping.
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