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Help CenterDN50 to DN300 Marine Cast Iron Flange Gate Valve, Standard Wall Thickness
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As a professional valve manufacturer with extensive experience in the marine industry, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to introduce our robust and reliable DN50 to DN300 Marine Cast Iron Flange Gate Valve. Engineered specifically for demanding shipboard and offshore applications, this valve series is designed to provide dependable flow control for seawater, ballast, bilge, and other critical ship systems. Our commitment to quality, backed by our ISO9001 certified manufacturing processes, ensures that every valve delivers the performance and durability required in the harsh marine environment.
Understanding the critical nature of marine operations, we have designed this gate valve to withstand corrosion, vibration, and pressure fluctuations commonly encountered at sea. The standard wall thickness construction offers an optimal balance between strength and weight, a crucial factor for shipbuilders and repair yards. With an annual export value reflecting our global reach and client trust, our products are specified by shipyards and marine engineers across key markets from North America and Europe to Southeast Asia and the Middle East.
The core value of this valve lies in its simplicity, reliability, and ease of maintenance. The full-bore design minimizes pressure drop, while the rising stem provides clear visual indication of the valve position. Whether for new vessel construction or maintenance of existing fleets, this valve is a trusted component for ensuring system integrity and operational safety.
Key Product Features & Technical Specifications:
- Rugged Cast Iron Body: Provides excellent strength and corrosion resistance, suitable for seawater and other marine fluids. The body is coated with a marine-grade epoxy paint for enhanced protection.
- Full-Bore Design: Allows for unobstructed flow with minimal pressure loss, which is essential for efficient pumping systems on board.
- Flanged Connection: Ensures a secure, leak-proof connection to piping systems. Flanges are drilled to standard international patterns (ISO, DIN, ANSI, JIS) as per customer requirements.
- Bronze or Stainless Steel Trim: The disc and seat are available in bronze or stainless steel options, offering superior wear resistance and compatibility with various media.
- Rising Stem with Indicator: The outside screw and yoke (OS&Y) design features a rising stem that clearly shows whether the valve is open or closed, preventing operational errors.
- Robust Packing System: Utilizes graphite or PTFE packing around the stem, ensuring a tight seal and allowing for easy adjustment or replacement in the field.
- Standardized Dimensions: Manufactured to comply with international standards, ensuring easy replacement and interchangeability with other valves in the system.
Detailed Technical Parameters Table:
| Parameter | Specification / Value |
|---|---|
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300 |
| Pressure Rating | PN10, PN16, Class 125, Class 150 (Customizable) |
| Body Material | Cast Iron (GG25/GGG40) |
| Trim Material (Disc/Seat) | Bronze (Standard), Stainless Steel CF8/CF8M (Optional) |
| Stem Material | Stainless Steel |
| Packing Material | Graphite, PTFE (Optional) |
| Gasket Material | EPDM, NBR, PTFE (As per standard or request) |
| Operation | Manual Handwheel (Gear Operator available for larger sizes) |
| Design & Test Standards | ISO 5208, API 598, MSS SP-70 |
Advantages and Customer Benefits:
- Enhanced System Reliability: The robust construction and quality materials minimize the risk of in-service failure, reducing downtime for vital marine systems.
- Cost-Effective Solution: Cast iron offers a favorable cost-to-performance ratio, providing long service life without the premium cost of exotic alloys for suitable applications.
- Global Compliance: Manufactured to widely accepted international standards, facilitating approval processes for ship classification societies like ABS, DNV, LR, BV, etc.
- Ease of Installation & Maintenance: The flanged design allows for straightforward installation and removal. The standardized design and accessible internals simplify maintenance tasks.
- Versatile Application: Suitable for a wide range of onboard services including cooling water, firefighting lines, tank filling/discharge, and general service lines.
Frequently Asked Questions (FAQ):
-
Q: Is this valve suitable for seawater service?
A: Yes, it is specifically designed for marine applications. The cast iron body with marine-grade coating, combined with bronze or stainless steel trim, provides good resistance to seawater corrosion. For highly aggressive conditions, specific material upgrades can be discussed. -
Q: What flange standards do you offer?
A: We can manufacture flanges to match most common international standards, including ISO (DIN), ANSI (ASME), JIS, and GB. The specific drilling pattern and facing must be specified at the time of order. -
Q: Do you provide documentation for classification society approval?
A: We can provide standard material certificates (3.1/3.2 as per EN 10204) and test reports. For specific classification society approval (e.g., ABS, DNV-GL), requirements should be specified so we can comply with the necessary manufacturing and testing protocols. -
Q: What is the lead time for an order of DN200 valves?
A: Lead time depends on order quantity and specific requirements. For standard configurations, typical production time is 4-6 weeks. We maintain efficient logistics from major ports like Shanghai, Guangzhou, and Hong Kong to ensure timely delivery. -
Q: Can the valve be operated with a gearbox?
A: Yes. For larger sizes (typically DN200 and above) or for applications requiring reduced operating torque, a manual gear operator can be supplied as an option. Please indicate this requirement in your inquiry. -
Q: What is the difference between PN10/PN16 and Class 125/150 pressure ratings?
A: PN (Pressure Nominal) is a metric rating (bar), common in ISO/DIN standards. Class (e.g., 125, 150) is an ANSI/ASME rating (psi). They represent different pressure-temperature ratings. Our valves are designed and tested to meet the requirements of the specified rating. It is crucial to specify the required standard for your project. -
Q: Do you offer any warranty on your valves?
A: Yes, we offer a standard warranty against defects in material and workmanship for a defined period under normal service conditions. The specific warranty terms are provided with our commercial offer. -
Q: Can you customize the valve, such as with a different paint color or extended stem?
A: Yes, we offer customization services. Options like specific paint colors (e.g., shipyard standards), extended stems for insulated lines, or different handwheel types are available. Please contact us with your detailed requirements for a quotation.
Shanghai Zhibang Valve's commitment to quality is demonstrated by our ISO9001 certification and our track record of serving a global clientele across North America, Europe, Asia, and beyond. With an annual export value reflecting consistent demand and customer satisfaction, we have established ourselves as a reliable partner for marine valve solutions. Our strategic location and multiple port options ensure flexible and cost-effective shipping to your destination.
Choosing our DN50-DN300 Marine Cast Iron Flange Gate Valve means selecting a product built for reliability in challenging environments. It represents a combination of proven design, controlled manufacturing, and a focus on the specific needs of the maritime industry. We invite shipyards, marine equipment suppliers, and ship owners to contact us for detailed specifications, competitive pricing, and to discuss how our valves can meet the precise requirements of your next project.
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