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Help CenterDual Plate Check Valve PN40 With 316L Stainless Steel Disc for Industrial Water Circulation
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Shanghai Zhibang Valve Manufacture Co., Ltd., established in 2016, proudly presents our Dual Plate Check Valve PN40 with 316L Stainless Steel Disc, engineered for reliable performance in industrial water circulation systems. As a professional manufacturer with ISO9001 certification, we combine precision machining and rigorous quality control to deliver a valve that minimizes pressure loss, prevents backflow, and ensures long service life. With annual export values exceeding US$1 million, our products are trusted across North America, Europe, Southeast Asia, and beyond.
This dual plate check valve is designed for high-pressure applications up to PN40 (40 bar) and features a lightweight, corrosion-resistant 316L stainless steel disc. The compact wafer-style body allows easy installation between flanges, making it ideal for space-constrained piping systems. Whether used in water treatment plants, cooling towers, or HVAC networks, our valve delivers consistent performance and low maintenance.
Key Features & Benefits
- 316L Stainless Steel Disc: Exceptional resistance to corrosion and pitting, ensuring durability in aggressive water environments.
- PN40 Pressure Rating: Suitable for high-pressure industrial circuits, reducing the risk of valve failure under load.
- Low Pressure Drop: Streamlined disc design and spring-assisted closure minimize flow resistance, lowering energy costs.
- Non-Slam Operation: The dual plate design with controlled closing prevents water hammer, protecting system components.
- Versatile Installation: Wafer or lug ends available, compatible with standard flanges (DIN, ANSI, JIS).
- Extended Service Life: Hardened seat and disc surfaces reduce wear, even in continuous operation.
- Easy Maintenance: Simple design allows quick inspection and replacement of internal parts.
Technical Specifications
| Pressure Rating | PN40 (40 bar / 580 psi) |
| Disc Material | 316L Stainless Steel (CF3M) |
| Body Material | Ductile Iron / Carbon Steel / Stainless Steel (optional) |
| Seal Material | EPDM, NBR, Viton (customizable) |
| Temperature Range | -20°C to +200°C (depending on seal) |
| Standard | ISO9001, API 594, DIN 3202, EN 558 |
| Connection | Wafer / Lug (per request) |
Our factory in Shanghai leverages advanced CNC machining and automated assembly lines to ensure consistent quality. Each valve undergoes hydrostatic testing at 1.5 times the rated pressure and a pneumatic seat leakage test before shipment. The 316L disc provides superior resistance to chloride-induced stress corrosion, making it particularly suitable for desalination plants, seawater cooling, and high-chloride water sources.
Application Scenarios
- Industrial water circulation and booster systems
- HVAC chilled water and hot water loops
- Fire protection sprinkler systems
- Wastewater treatment plants
- Chemical processing with compatible fluids
With over 8 years of valve manufacturing experience, Shanghai Zhibang Valve has built a reputation for reliability. Our main markets span across 6 continents, and we have shipped over 100,000 units to global clients. We are ISO9001 certified, ensuring that every production step follows strict quality management procedures. Our annual export value of US$1–1.5 million reflects the trust placed in our products by international buyers.
We offer flexible shipping from Shanghai, Guangzhou, Hong Kong, and Beijing ports, providing competitive logistics solutions. Customization options such as special coatings, extended bonnets, or different seal materials are available upon request. Our technical team can assist with valve selection, installation guidance, and after-sales support.
Choose our Dual Plate Check Valve PN40 with 316L Stainless Steel Disc for your next project and experience the combination of quality, performance, and affordability. Contact us today for a quotation or technical datasheet.
Frequently Asked Questions (FAQ)
- What is the difference between a dual plate check valve and a swing check valve? A dual plate check valve uses two spring-loaded plates that open with flow and close quickly, reducing water hammer and pressure drop. It is more compact and lighter than a swing check valve, making it ideal for tight spaces.
- Can this valve be used for vertical pipeline installation? Yes, the dual plate check valve can be installed in both horizontal and vertical lines (with upward flow). For vertical downward flow, a spring-assisted design is recommended – our standard configuration supports this.
- What is the maximum operating temperature for the EPDM seal? EPDM seals are suitable for temperatures up to 120°C continuously. For higher temperatures, we recommend NBR (up to 100°C) or Viton (up to 200°C). Please specify your temperature requirement when ordering.
- Do you provide a warranty for this product? Yes, we offer a standard 12-month warranty from the date of shipment against manufacturing defects. Extended warranty options are available upon request.
- Can the disc material be changed to another grade of stainless steel? Absolutely. While 316L is standard for this model, we can supply discs in 304, 316, or duplex stainless steel as per your project requirements. Additional cost may apply.
- What is the pressure drop across this valve at full flow? The pressure drop is minimal due to the streamlined design. For a typical 4" (DN100) valve at 2 m/s flow velocity, the pressure drop is approximately 0.1 bar. Detailed Cv values are available in our technical datasheet.
- How long is the lead time for standard sizes? For standard sizes from DN50 to DN300, lead time is 10–15 working days. Larger sizes may require 20–25 working days. Rush orders can be accommodated with prior arrangement.
- Does the valve comply with international standards? Yes, our check valves are designed and tested in accordance with ISO9001, API 594, and DIN 3202 standards. They are suitable for use in systems following ASME B16.5 or EN 1092 flanges.
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