Why Choose Our Valve Disc
- 27 years of experience in manufacturing valve discs
- Manufactured from 304/316L stainless steel
- Provide Spectrometric Analysis
- Provide Non-Destructive Testing
- Provide 3D Rapid Prototyping
- Provide 100% Leak Testing
Valve Disc Foundry in China
As a professional investment casting foundry in China, we are committed to providing you with OEM custom, fully machined investment-cast valve discs made of 304/316L (CF8/CF3M) stainless steel that offer high precision, high structural strength, good airtightness, and corrosion resistance. Over the past 27 years, we have established long-term, stable partnerships with numerous international clients, achieving an annual output value of $8 million. Moreover, our custom stainless steel valve discs are designed and dimensioned to meet the material and geometric requirements of valves in accordance with API 609 and ASME B16.34 standards.
We have also helped numerous clients resolve valve disc issues. For example, by optimizing the gating system, we prevent porosity, shrinkage, and other internal defects in the valve discs at the source. We also use specialized non-destructive testing, airtightness testing, and hardness testing to ensure that the valve discs have no internal defects, uniform hardness, excellent airtightness and mechanical properties, thus avoiding fracture during operation.
If you are facing similar challenges or looking to optimize your stainless steel valve disc, contact us today to discuss your custom requirements.
Valve Discs We Make
Cover concentric, double-offset, and triple-offset disc geometries, achieving zero-leakage shutoff with minimal operating torque.
Feature swing, lift, and dual-plate check-valve discs specifically designed to withstand high-frequency water hammer impacts.
Feature needle, plug, or flat-disc designs, specifically engineered for precise regulation and leak-free shutoff of high-pressure media.
Why do you need Valve Discs made from 304/316L stainless steel?
The passivation film on the stainless steel surface enables valve discs to withstand corrosive media such as dilute acids. 316L valve discs can even withstand pitting corrosion, preventing corrosion of the sealing surface.
Valve discs made of 304 and 316L possess exceptional toughness, allowing them to undergo slight deformation under violent fluid impacts during opening or closing, preventing fracture at the valve disc-hub connection.
316L exhibits high-temperature creep resistance. Even with short-term exposure at 650°C, 316L valve discs can maintain structural integrity, preventing valve seizure due to permanent deformation of the sealing surfaces.
Valve discs made of 304 and 316L benefit from a work-hardened surface layer achieved during machining. Combined with surface finishing, this prevents galling between the valve disc and seat during high-frequency cycling.
Standard Material Control
Changes in the composition of stainless steel directly affect the properties of valve discs. For example, the molybdenum contained in 316L steel is essential for preventing the valve disc from corroding in a seawater environment, and the chromium in 304 and 316L stainless steel castings is essential for forming a surface passivation film. To ensure the material meets the standard, we perform spectrometry to verify the elemental composition of 304 and 316L both before and after the valve disc casting process. This guarantees that your valve disc castings will exhibit excellent corrosion resistance, ensuring your system runs smoothly in the long term without catastrophic media leaks in corrosive environments.
Precision Geometric Control
Valve discs have stringent geometric tolerance requirements for their sealing surfaces; even the slightest deviation in angle or concentricity will cause leakage once the valve is fully closed. Through near-net properties of investment casting and inspection using HEXAGON coordinate measuring machines, we ensure that the valve disc’s sealing surface has exceptional flatness, roundness, and a surface roughness of Ra ≤ 0.4 μm. We also ensure exceptional coaxiality and perpendicularity at the stem connection, guaranteeing that your valve disc’s sealing surface fits precisely against the valve seat and that the project operates smoothly without leaks caused by dimensional issues.
Excellent Quality Inspection
If there are microscopic pores in the valve disc, cracks may form internally under water hammer, preventing the valve casting from operating normally. To address this issue, we perform a series of tests on the casting after the stainless steel valve disc is cast, including non-destructive testing, hardness testing, tensile testing, and airtightness testing, to ensure that there is no casting porosity or shrinkage inside the valve disc and that all mechanical properties meet the standards. By eliminating internal casting defects before delivery, we protect your valve discs from premature failure, minimize unplanned downtime, and significantly reduce the long-term maintenance costs for your engineering projects.
Certified to Meet Global Standards for High-Pressure Equipment
Your Reliable Manufacturing Partner for Valve Discs
With 27 years of precision investment casting experience, 18 years of precision CNC machining experience, and 11 years of mold development experience, we have comprehensive casting capabilities, including customizing valve discs to your specific designs, such as double offset or triple offset in butterfly valve discs, and teardrop shape in check valve discs.
Moreover, as a one-stop foundry, we can provide you with high-quality valve discs. With the near-net-shape properties of investment casting, we have resolved excessive tool wear during machining caused by the work-hardening characteristics of 304 and 316L. We can cast complex structures in the valve disc in a single casting, such as streamlined vanes and weight-reduction cavities, requiring only minimal machining and significantly reducing lead times. Furthermore, through 3D mold design, we can achieve highly streamlined curved valve disc edges during casting, guaranteeing lower fluid resistance and smoother valve disc operation for you.
Diverse Applications for Stainless Steel Valve Discs
In the pharmaceutical industry, valve discs must remain absolutely pure. However, valve discs with high carbon content may develop intergranular corrosion, creating microscopic pits where bacteria can thrive. Our 316L valve discs have an extremely low carbon content, which eliminates these microscopic traps, thereby ensuring a contamination-free seal.
The food industry requires zero contamination. When valves are opened and closed frequently, friction occurs between the valve disc and the seat, resulting in metal particles that directly contaminate the food. However, our stainless steel valve discs, with a smooth surface finish and a stable passivation layer, effectively prevent metal pickup and food contamination.
In marine engineering, high-velocity seawater flow across the valve disc edge can create localized low-pressure zones, leading to cavitation erosion of the sealing surface. However, our 316L valve discs have exceptional resistance to pitting corrosion and erosion, ensuring the edges of your valve discs remain smooth under high-speed seawater exposure.
At temperatures as high as 400°C, the valve disc is subjected to enormous pressure differentials due to pipeline shutdown, causing creep under such high-temperature steam conditions. Our 316L valve discs offer higher tensile strength and creep resistance at high temperatures, ensuring structural stability of the sealing surface and preventing leaks.
Your Reliable Manufacturing Partner in China
Our valve disc castings are intended for use in the chemical industry, so it is crucial for us that the materials meet the required standards. Pingheng Machinery always provides the corresponding material compliance reports when supplying stainless steel valve disc castings, which gives us great confidence in the quality of their castings. They are one of the few Chinese stainless steel casting manufacturers we can fully trust.
——Markus Weber, Head of Global Procurement
The dimensional accuracy of the valve discs manufactured by Pingheng Machinery is excellent, and the coaxiality of the valve stem bores matches our dimensional drawings perfectly. We can install them in our valves right out of the box, which saves us time on secondary debugging. I think we will continue to work together for a long time.
——David Miller, Quality Assurance Director
304 valve discs are suitable for industrial applications involving water and less corrosive media. However, with low carbon content and 2%–3% molybdenum, 316L valve discs offer greater resistance to pitting and intergranular corrosion than 304 valve discs, making them suitable for marine engineering, the chemical industry, and pharmaceutical applications.
Using the investment casting process, we can achieve casting tolerances of CT5–CT6 for our stainless steel valve discs. During subsequent machining, for the sealing surface, valve stem connection hole, keyway, and other complex structures, we can use precision CNC machines to achieve dimensional tolerances down to ±0.01 mm and a sealing surface roughness of Ra 0.4 μm.
The sealing surfaces of our stainless steel valve disc castings are isolated from one another with custom plastic protective covers, then vacuum-sealed, and finally packed into fumigation-free wooden crates that meet IPPC standards. These crates are equipped with internal grid dividers that effectively prevent damage from impacts during transit.
Yes, we offer 3D prototyping services for efficient small-batch customization of stainless steel valve discs, with delivery within 7–10 days.
We use a one-stop customization service, from mold design and fabrication to CNC machining. With this integrated service, lead time is typically within 45 days.
