Product Introduction
Precision cast stainless steel valve discs are one of the vital fluid-control components. Installed inside the valve body and driven by manual or electric mechanisms, they rotate, lift, or swing relative to the valve seat to achieve fluid shut‑off and flow regulation.
Technical Specifications
|
Item |
Specification |
|
Product Name |
Precision Cast Stainless Steel Valve Discs / Precision Cast Stainless Steel Valve Disks |
| Optional Material Grades | CF8, CF8M, CF3, CF3M, 304, 304L, 316, 316L, CD4MCU, 2205, S32750, 2507, 13Cr, 1.4307, 1.4308, 1.4404 |
|
Casting Method |
Investment Casting / Lost Wax Casting |
|
Tolerance |
Castings: ISO 8062 CT4-CT6; Finish machined valve discs: Min±0.02mm |
|
Surface Roughness |
Casting surfaces: Ra 3.2 -6.3 μm; Machining surfaces: Ra 1.6 - 3.2 μm |
|
Surface Treatment |
Passivation, polishing, electro-polishing, coating |
|
Working Temperature |
-40℃~ 550℃, depending on material grades |
| Applicable Media |
304, 316, CF8, CF8M for most of the media, e.g. fresh water, steam, oil products, natural gas, nitric acid, acetic acid, seawater, brine, mild acids and alkalis; 316L, 2205, 2507 for highly corrosive working conditions |
| OD | DN10-DN1500, customizable according to drawings |
| Valve Disc Structure | Solid / Hollow discs for butterfly valves, globe valve discs, gate plates, double-disc check valve discs |
| Sealing Surface Treatment | CNC mirror polishing, Ra ≤ 0.8 μm, or according to technical requirements |
| Single Piece Weight | 0.1 - 60 kg |
| Certification | ISO 9001, ISO 14001, ISO 45001 |
| MOQ | 100 kg, prototype orders for valve discs are acceptable |
Key Features of Our Precision Cast Stainless Steel Valve Discs
Ultra-Tight Dimensional Precision
Achieving the sealing function of the valve plate relies on high casting precision. Warpage, twist or eccentric distortion of valve castings will result in seal failure and valve internal leakage.
The silica sol investment casting process utilizes a multi-layered ceramic shell characterized by high strength, high hardness, and high-temperature resistance. This enables the production of high-precision valve disc castings (CT4-CT6) while minimizing issues such as bulging, collapse, and sand erosion, providing process assurance for favorable valve sealing performance.
Same Mold for Diverse Cast Stainless Steel Grades
For a single valve disc mold, we support switching between stainless steel grades with similar shrinkage rates.
For example, customers can freely choose from stainless steel grades such as CF8, CF8M, CF3, and CF3M, allowing a single mold to produce valve discs in various configurations, saving on tooling costs and mold development time.
Cast‑In Shaft Bore Prevents Casting‑Defect Failures
Due to uneven wall thickness, the stem-bore area of the valve disc is a high-risk hot-spot zone.
Instead of conventional casting solutions that cast a solid component and drill the bore later, we pre-cast the stem-bore with machining allowance, remove the solid metal in the center to eliminate the heavy-section hot spot, and improve solidification feeding.
The final precision cast stainless steel valve discs are free of shrinkage cavities around the stem-bore, thereby preventing pitting, crevice corrosion, and media leakage caused by internal casting defects.
Controlled Ferrite Content To Restrain Hot Cracking
For investment cast austenitic stainless steel valve discs with fully austenitic solidification microstructure, low-melting-point impurities such as phosphorus (P) and sulfur (S) tend to form weak, network-like films at the grain boundaries, making the material susceptible to hot cracking.
During the melting process, we strictly control the chromium (Cr) and nickel (Ni) equivalents to ensure a specific ferrite content (3%–8%). This ferrite is distributed along the austenite grain boundaries, breaking up the network-like films into discontinuous segments; this prevents the formation of large, continuous paths of weakness, thereby mitigating the risk of hot cracking in the valve plates.
High Material Cleanliness for Enhanced Corrosion Resistance
During the smelting process, we strictly control the levels of harmful impurities such as phosphorus (P) and sulfur (S).
During pouring, we ensure the ladles are clean and free of residue.
These measures guarantee high material purity and prevent the degradation of corrosion resistance caused by excessive inclusions.
Wide‑range Adaptability for Diverse Environments
In addition to CF8 and CF8M grades, we offer custom precision cast stainless steel valve discs in multiple special‑purpose materials, such as CF3M, F51 (2205 duplex steel), 2507 super duplex stainless steel, Alloy 20, and HK40 heat-resistant stainless steel.
These options enable precise matching for various working conditions such as heavy corrosion, high temperature, high‑chloride media and seawater service.
Suitable Valve Types for Our Precision Cast Stainless Steel Valve Discs
Valve disc raw castings produced via the investment casting process offer high dimensional accuracy, thereby minimize the machining workload and reduce per-unit costs.
Compared to sand casting, investment-cast valve plates exhibit fewer internal defects and offer superior corrosion resistance and sealing performance.
Consequently, our precision cast stainless steel valve discs serve as reliable OEM-compatible components for a wide range of industrial valves, delivering consistent performance in applications such as petrochemical processing, water treatment, and oil and gas pipelines.
01
Globe Valves
02
Butterfly Valves
03
Gate Valves
04
Check Valves
05
Control Valves
06
Plug Valves
Competitive Prices Come From Lean Production
There is no absolute conflict between quality and price!
Lean production effectively strikes a balance between the two, enabling us to manufacture high-quality, cost-effective precision cast stainless steel valve discs.
- Multi‑cavity automatic wax‑injection molds for high‑volume valve‑disc orders boost production efficiency and reduce labor‑related costs for larger batch projects.
- Automated conveyor lines within the shell‑making workshop cut handling loss and waste generated by process waiting, stabilizing overall production throughput.
- Optimized gating and pouring systems maintain our valve‑disc casting pass rate above 98%, minimizing rework and scrap costs passed to customers.
- Engineer‑optimized wax‑pattern tree assemblies fit more valve discs per cluster, lifting material utilization and driving down per‑unit material costs.
- Precision casting molds fully secure non‑critical holes and standard dimensional tolerances, removing unnecessary CNC‑machining work and further lowering component costs.
Our Certificates
- ISO 9001: Our ISO 9001 certification is far more than just a piece of paper; it governs the entire production process for our precision cast stainless steel valve discs, from wax molding, casting, heat treatment, machining, to non-destructive testing.
- It is a powerful guarantee of consistent product quality and superior valve reliability for our customers.
- ISO 14001: We not only manufacture high-quality precision valve castings, but also prioritize low-carbon operations and environmental responsibility.
- Our foundry is equipped with comprehensive environmental protection facilities, ensuring strict, end-to-end control over exhaust emissions, solid waste, hazardous materials, and industrial wastewater.
- While delivering reliable precision cast stainless steel valve discs to our customers, we practice green manufacturing and contribute to global environmental protection efforts.
- ISO 45001: ISO 45001 standardizes high‑risk foundry and machining workflows to mitigate workplace hazards.
- It minimizes human‑induced casting defects and unplanned factory shutdown risks, safeguarding stable yield and consistent lead‑times for your valve disc orders.
- It also delivers third‑party‑verified evidence to satisfy your ESG social‑responsibility supplier audits.
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