ALL CATEGORIES

Seller Center
- Product Management
  
  Post Product
  
  Manage Products
  
  Featured Products
- Blog Management
  
  Post Blog Article
  
  Manage Blog Articles
  
  Manage Blog Categories
- Inquiry Management
  
  My Inquiries
  
  Buying Requests
- Analytics Center
  
  Performance Dashboard
  
  Product Analytics
  
  Visitor Analytics
Connect Your Store to WeChat

Follow Our Official Service Account
Manage Products & Inquiries Anywhere
Seller Services

Seller Services

Goldsupplier.com: 20 years of Global Trade Expertise, Empowering Your Business to Go Global!

Join GoldSupplier.com

Free & Instant Registration

Showcase Company & Products

Access Global Buying Requests

Register Now

Activate Verified Supplier Membership

Priority Verified Visibility

Claim Exclusive Buying Requests

Automated Multi-language Store

Verified Now

Launch Your EasyOcean Website

Full-Service Website Management

Google Page 1 Guarantee

Enhanced Brand Credibility

Launch Now
Buyer Services
Post Buying Request

Browse Product Categories

Featured Suppliers
Contact Platform Support

Help Center

Home > Industrial Equipment & Components > Valve > Check Valve > Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal thumbnail-3

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal thumbnail-4

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal thumbnail-5

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal photo-1

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal photo-2

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal photo-3

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal photo-4

Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR Seal photo-5

Product Spotlights

Customized non-standard ductile iron marine check valve with PN25 rating, wafer type, and NBR seal. ISO9001 certified manufacturer offering tailored dimensions, compact design, oil/water resistance, and global shipping from Shanghai, Guangzhou, Hong Kong, Beijing. Suitable for shipbuilding, offshore, and industrial backflow prevention.

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

Get Latest Price

Material:

Other, Ductile Iron (QT400-18)

Application:

Other, Marine

Pressure Rating:

PN25

Contact Supplier Request Quote Chat Now

Shanghai Zhibang Valve Manufacture Co.,ltd

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
Company Profile
Contact Us

Material Other, Ductile Iron (QT400-18)

Application Other, Marine

Pressure Rating PN25

Type Wafer Type, Non-Standard

Seal Material NBR (Nitrile Rubber)

Connection Wafer (Between Flanges)

Size Range DN50 – DN600 (Customized Available)

Design Standard Customized / Non-Standard

Shanghai Zhibang Valve Manufacture Co., Ltd. – your trusted partner in high-performance valve solutions – proudly presents our Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type with NBR Seal. As an ISO9001-certified manufacturer established in 2016, we combine years of engineering expertise with advanced production capabilities to deliver valves that meet the rigorous demands of marine, offshore, and industrial applications. This check valve is designed to prevent backflow in piping systems where space is limited and reliability is critical. Its ductile iron body ensures superior strength and corrosion resistance, while the NBR (nitrile rubber) seal provides excellent oil and water resistance, making it ideal for seawater, fuel, and hydraulic systems. The wafer-type design allows for easy installation between flanges, reducing weight and cost without compromising performance. With non-standard customization options and a pressure rating of PN25, this valve can be tailored to your specific system requirements, ensuring a perfect fit and long-lasting service.

Key Features & Technical Specifications

Material Excellence: Body made of QT400-18 ductile iron, offering high tensile strength and impact resistance, with a protective epoxy coating for enhanced corrosion protection.
Seal Performance: NBR seal (Nitrile Butadiene Rubber) – excellent resistance to petroleum-based oils, hydraulic fluids, and saltwater; temperature range -20°C to +100°C.
Pressure Rating: PN25 (25 bar / 362.6 psi) – suitable for medium-to-high pressure marine systems.
Non-Standard Customization: We can modify dimensions, flange drilling patterns, stem length, and material grades to match your existing piping layout or special requirements.
Wafer Type Design: Compact and lightweight – fits between ASME or DIN flanges without additional supports; easy to install and maintain.
Flow Direction: One-way flow with a spring-assisted disc (optional) for quick closing and reduced water hammer.
Low Pressure Drop: Optimized disc profile minimizes resistance, ensuring efficient system operation.
Quality Assurance: 100% pressure tested in-house; ISO9001 certified manufacturing processes (Certificate No. available upon request).

Technical Parameter Table

Parameter	Details
Body Material	Ductile Iron (QT400-18) / Customizable (e.g., CF8M)
Seal Material	NBR (Nitrile Rubber)
Pressure Rating	PN25 (25 bar)
Nominal Diameter	DN50 – DN600 (Custom sizes available)
Working Temperature	-20°C to +100°C (NBR)
End Connection	Wafer (ANSI / DIN / JIS – as per request)
Face-to-Face Dimension	EN 558 / API 594 or Customized
Test Pressure	Shell: 1.5×PN, Seat: 1.1×PN

Benefits for Your Marine Applications

Space-Saving Installation: Wafer design reduces overall length by up to 60% compared to traditional flanged check valves – ideal for tight engine rooms and offshore modules.
Enhanced Durability: Ductile iron withstands vibration, shock loads, and thermal expansion common in marine environments.
Seal Reliability: NBR rubber provides a bubble-tight seal against both water and oil, preventing costly backflow damage.
Custom Fit: Non-standard modifications (e.g., overlength stems, special flange holes, or reduced bore) ensure seamless integration with legacy or foreign-designed systems.
Cost-Efficiency: Lightweight construction reduces supporting structure costs and simplifies logistics.
Low Maintenance: Straight-through flow path minimizes debris accumulation; seat can be replaced without removing the valve from the line (optional design).

Trusted by Global Marine Industry – Since 2016
Shanghai Zhibang Valve Manufacture Co., Ltd. has exported over US$1.5 million worth of valves annually to more than 15 countries including North America, South America, Europe, Southeast Asia, Africa, and the Middle East. Our valves are widely used in shipbuilding, offshore platforms, and marine auxiliary systems. We hold ISO9001:2015 certification (Certificate available for review), and each product undergoes rigorous hydraulic and pneumatic testing before shipment. With a dedicated R&D team, we can accommodate custom designs within a 7–15 day lead time. Choose our PN25 wafer check valve with NBR seal – backed by competitive pricing, on-time delivery, and responsive after-sales support. Contact us today for a quotation or technical drawing.

Frequently Asked Questions

Q: What is the difference between a standard and a non-standard check valve?
A: A standard valve follows common industry dimensions (e.g., EN 558, API 594). A non-standard valve is customized to meet specific face-to-face lengths, flange drilling patterns, or material requirements not covered by standard catalog items. Our non-standard option allows you to replace an existing valve without modifying the pipeline.
Q: Can the NBR seal be used for seawater?
A: Yes, NBR has good resistance to saline water and is commonly used in marine cooling water and ballast systems. However, if your application involves high-temperature seawater or aggressive chemicals, we recommend EPDM or Viton seals (available as alternatives).
Q: What is the maximum temperature for the NBR seal?
A: The continuous working temperature range for NBR is -20°C to +100°C. For higher temperatures (up to 150°C), we offer a Viton (FKM) seal option.
Q: Do you offer a spring-loaded disc for horizontal piping?
A: Yes, we can add a spring assist to the disc to ensure faster closing and reduce water hammer in horizontal pipelines. This feature is customizable and can be included at an additional cost.
Q: What flange standards are compatible with your wafer check valve?
A: Our standard design matches both ASME B16.5 Class 150 and DIN PN25/PN16 flanges. For other standards (JIS, BS, etc.), we can adjust the drilling pattern and gasket seat dimensions.
Q: How do you ensure the quality of non-standard valves?
A: Every valve, whether standard or custom, is 100% hydrostatically shell-tested and seat-leak tested according to ISO 5208. Our ISO9001 quality management system covers the entire production process from raw material inspection to final packaging.
Q: What is the lead time for a customized PN25 check valve?
A: Typical lead time is 15–20 working days for standard sizes (DN50–DN300). Larger diameters or complex modifications may require 25–30 days. Urgent orders can be expedited upon request.
Q: Can you provide a material certificate or test report?
A: Yes, we can supply a material certificate (EN 10204 3.1) and a hydraulic test report with each shipment. Additional third-party inspection is also accepted.