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Home > Industrial Equipment & Components > Valve > Check Valve > DN50-DN300 Cast Steel Flanged Dual Plate Check Valve Stainless Steel Disc NBR Seal DNV BV Approved
DN50-DN300 Cast Steel Flanged Dual Plate Check Valve Stainless Steel Disc NBR Seal DNV BV Approved
Product Spotlights
DN50-DN300 cast steel flanged dual plate check valve with stainless steel disc and NBR seal. DNV & BV approved, ISO9001 certified. Spring-assisted non-slam closure, low pressure drop, corrosion-resistant internals. Customizable pressure ratings and flange standards. Ideal for water, oil, gas, and marine applications.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
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Application:
Other, Water
Size Range:
DN50 - DN300 (2“ - 12“)
Body Material:
Cast Steel (ASTM A216 WCB)
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Application
Other, Water
Size Range
DN50 - DN300 (2“ - 12“)
Body Material
Cast Steel (ASTM A216 WCB)
Disc Material
Stainless Steel (SS304/SS316)
Seal Material
NBR (Nitrile Butadiene Rubber)
Connection Type
Flanged (RF/FF)
Working Pressure
PN16/PN25 (available upon request)
Working Temperature
-20°C to +80°C (for NBR seal)
Certifications
ISO9001, DNV, BV
Design Standard
API 594 / BS EN 16668 (customizable)
Shanghai Zhibang Valve Manufacture Co., Ltd. (established 2016, ISO9001 certified) proudly presents our DN50-DN300 Cast Steel Flanged Dual Plate Check Valve with stainless steel disc and NBR seal. Designed for reliable backflow prevention in pipeline systems, this valve combines robust construction with proven DNV and BV type approval, ensuring compliance with international marine and industrial standards. As a manufacturer with over US$1 million annual export value and global shipments to North America, Europe, Southeast Asia, and beyond, we deliver quality you can trust.
Product Overview:
- Compact dual-plate design — reduces installation space and weight compared to swing check valves.
- Spring-assisted closing — minimizes water hammer and provides quick, silent shut-off.
- Stainless steel disc (SS304/SS316) — excellent corrosion resistance for aggressive media.
- NBR (nitrile) elastomer seal — tight sealing against low-pressure backflow; suitable for oil, water, and gas applications.
- Flanged ends (RF or FF) — easy installation between standard pipeline flanges (PN16/PN25).
- DNV & BV approved — meets requirements for marine, offshore, and industrial use.
Technical Specifications (Typical, Subject to Customization):
| Size Range | DN50 – DN300 (2" – 12") |
| Body Material | Cast Steel (ASTM A216 WCB / LCB optional) |
| Disc Material | Stainless Steel (SS304 / SS316 / Duplex) |
| Seal Material | NBR (Nitrile) – custom options: EPDM, Viton® |
| Connection | Flanged (RF/FF per ASME B16.5 or DIN) |
| Pressure Rating | PN10 / PN16 / PN25 (Class 150 / 300 available on request) |
| Operating Temperature | -20°C to +80°C (NBR); others available |
| Approvals | ISO9001:2015, DNV, BV, ABS (upon request) |
Key Advantages for Your Application:
- Low pressure drop — streamlined flow path reduces energy loss.
- Non-slam performance — spring-assisted closure prevents damaging pressure surges.
- Corrosion-resistant internals — stainless steel disc and optional coating extend service life.
- Versatile media compatibility — suitable for water, oil, gas, steam, and many chemical fluids (with appropriate seal).
- Easy maintenance — cartridge-style seat/disc assembly can be replaced without removing valve from line.
- Full factory testing — each valve hydrostatically tested (body: 1.5x rated pressure; seat: 1.1x rated pressure).
Why Choose Shanghai Zhibang Valve?
- Reliable manufacturer — established in 2016, ISO9001 certified, with annual export value US$1-1.5 million.
- Global shipping — from ports: Shanghai, Guangzhou, Hong Kong, Beijing; covering all major world markets.
- Third-party approved — our dual plate check valves hold DNV and BV type approval certificates, verifiable upon request.
- Customization welcome — we offer tailored pressure ratings, flange standards, disc materials, and seal compounds to meet your project needs.
- Competitive lead times — typical 15-30 days for standard sizes, with quick-turn options.
Frequently Asked Questions (FAQ):
-
Q: What is the working pressure of this valve?
A: Standard pressure ratings are PN16 (16 bar) and PN25 (25 bar). Higher ratings (Class 150/300) are available as custom options. -
Q: Can it be used for seawater or corrosive fluids?
A: Yes. The stainless steel disc provides good corrosion resistance. For aggressive media, we recommend upgrading to SS316 or duplex disc, and choosing a compatible seal (e.g., EPDM for seawater). -
Q: Does the valve require a minimum back pressure to close?
A: No. The spring-assisted design ensures positive closure even under low flow or zero back pressure, preventing reverse flow. -
Q: Are DNV and BV certificates genuine?
A: Absolutely. We hold valid DNV and BV type approvals for this valve series. Copies of certificates can be provided upon request. -
Q: What flange standards are available?
A: We offer flanges per ASME B16.5 (Class 150/300) and DIN 2501 (PN10/16/25). Other standards (JIS, GOST) are available on request. -
Q: How long is the warranty?
A: We provide a standard 12-month warranty against manufacturing defects from the date of shipment. Extended warranty may be negotiated. -
Q: Can I get a sample valve before bulk order?
A: Yes, sample orders are welcome. We can produce a single unit for testing; lead time approximately 10-15 working days. -
Q: What is the installation orientation?
A: The valve can be installed in any orientation (horizontal, vertical, or inclined). However, for optimal performance, horizontal installation with the disc axis vertical is recommended.
Contact Us Today
Shanghai Zhibang Valve Manufacture Co., Ltd. combines ISO9001 quality management, DNV/BV-approved products, and global logistics to deliver reliable check valves for your critical systems. Our experienced team can assist with technical selection, custom dimensions, and competitive pricing. Request a quote or catalog now — we ship from Shanghai, Guangzhou, Hong Kong, or Beijing within 20–30 days. Your satisfaction is our priority.
Send Inquiry to This Supplier
1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
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