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Home > Industrial Equipment & Components > Valve > Gate Valve > Large Diameter Marine Gate Valve DN300 With Ductile Iron Construction and Mill Test Report

Large Diameter Marine Gate Valve DN300 With Ductile Iron Construction and Mill Test Report

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Large Diameter Marine Gate Valve DN300 With Ductile Iron Construction and Mill Test Report photo-4

Large Diameter Marine Gate Valve DN300 With Ductile Iron Construction and Mill Test Report photo-5

Product Spotlights

DN300 marine gate valve built with high-strength ductile iron for superior impact resistance in demanding offshore and shipboard applications. Features epoxy coating for corrosion protection, optional bronze/stainless steel trim for seawater service, and comes with full material traceability via Mill Test Reports (MTR). Ideal for main seawater, ballast, and fire main lines requiring reliable, leak-tight shutoff.

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

Key Specifications

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Valve Type:

Gate Valve

Nominal Diameter (DN):

300

Construction Material:

Ductile Iron Body and Disc

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

Valve Type Gate Valve

Nominal Diameter (DN) 300

Construction Material Ductile Iron Body and Disc

End Connection Flanged (Standard), other types optional

Pressure Rating PN10/PN16/PN25 (Available upon request)

Operation Mode Handwheel operated, Gearbox optional

Application Field Marine, Offshore, Shipbuilding, Port Facilities

Seat Material Bronze/Stainless Steel trim optional

Coating/Finishing Epoxy coating, other finishes customizable

Documentation Mill Test Report (MTR) provided

As a professional valve manufacturer established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing robust and reliable fluid control solutions for demanding marine environments. Our Large Diameter Marine Gate Valve DN300 is engineered specifically to meet the stringent requirements of shipbuilding, offshore platforms, and port infrastructure. Constructed with high-grade ductile iron and backed by comprehensive Mill Test Reports, this valve delivers exceptional durability, leak-tight shutoff, and long-term performance in seawater and other corrosive media, ensuring the safety and efficiency of your critical piping systems.

This valve is designed for on/off service in pipelines where a straight-line flow and minimum pressure drop are required. Its large diameter makes it ideal for main seawater lines, ballast systems, fire mains, and other essential shipboard services.

Key Features & Technical Advantages:

Superior Material Integrity: The valve body, bonnet, and gate are manufactured from high-quality ductile iron (also known as nodular cast iron), which offers a superior combination of strength, toughness, and impact resistance compared to standard gray cast iron. This material choice significantly reduces the risk of cracking under pressure or thermal shock.
Corrosion Resistance for Marine Use: Standard valves feature a high-quality epoxy coating internally and externally to protect against seawater corrosion. For more aggressive environments, optional trim materials like bronze or stainless steel for the seat and gate are available to extend service life.
Reliable Sealing Performance: The parallel wedge or solid wedge gate design ensures a bubble-tight seal when fully closed. The precision-machined seating surfaces and resilient seating materials (where applicable) minimize leakage, a critical factor for marine safety and environmental protection.
Robust Construction & Easy Operation: Designed for DN300 pipelines, the valve features a sturdy, reinforced body structure capable of withstanding pipeline stresses. The large handwheel provides mechanical advantage for easier opening and closing against high differential pressures. A gearbox operator is available as an option for valves requiring higher torque.
Full Traceability & Quality Assurance: Each valve is supplied with a Mill Test Report (MTR) for the ductile iron castings, providing traceability of chemical composition and mechanical properties. This documentation is crucial for marine classification society approvals and quality audits.

Detailed Technical Specifications:

Parameter	Specification
Valve Type	Rising Stem, Outside Screw & Yoke (OS&Y) Gate Valve
Size (Nominal Diameter)	DN300 / 12"
Pressure Class	PN10, PN16, PN25 (Standard: PN16)
Body & Bonnet Material	Ductile Iron (GGG-40/50)
Gate Material	Ductile Iron, Stainless Steel Coated or Solid Bronze Optional
Stem Material	Stainless Steel (Standard)
Seat Ring Material	Bronze or Stainless Steel (Optional)
End Connection	Flanged to DIN/ANSI/BS/JIS standards
Packing	Graphite-based, suitable for high temperatures
Test Standards	Shell Test & Seat Test per API 598 / EN 12266

Benefits for Your Marine Projects:

Enhanced System Reliability: The proven design and robust construction minimize downtime and maintenance requirements in critical marine applications.
Compliance Support: The provided MTR and potential for third-party inspection facilitate compliance with marine classification society rules (e.g., ABS, DNV, LR, BV).
Cost-Effective Solution: Ductile iron offers an optimal balance of performance and cost for large-diameter valves, providing long-term value without compromising on quality.
Flexibility: Available in various pressure ratings, trim materials, and flange standards to match your specific project specifications.

Backed by our ISO9001-certified quality management system and experience serving global markets across North America, Europe, Southeast Asia, and beyond, Shanghai Zhibang guarantees that every DN300 Marine Gate Valve is manufactured to precise standards. Our annual export volume of US$1-1.5 million underscores our capability and reliability as a trusted supplier. With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure efficient logistics to meet your project timelines. Choose our large diameter marine gate valve for a combination of strength, verified quality, and marine-grade performance that protects your investment and ensures operational continuity. Contact us today to discuss your requirements, request a detailed quotation, or arrange for product samples and testing.

Frequently Asked Questions (FAQ):

Q: What is the main advantage of using ductile iron for a marine gate valve instead of cast iron?
A: Ductile iron has significantly higher tensile strength, yield strength, and impact resistance than gray cast iron. This makes it much less brittle and more suitable for the dynamic stresses, potential water hammer, and harsh conditions encountered in marine applications.
Q: Can this valve be used with seawater?
A: Yes, it is specifically designed for marine service. The standard epoxy coating provides good protection. For prolonged seawater exposure, we highly recommend opting for bronze or stainless steel trim (seat and gate) to maximize corrosion resistance.
Q: What is included in the Mill Test Report (MTR)?
A: The MTR typically includes the heat number, chemical analysis (content of C, Si, Mn, P, S, etc.), mechanical property test results (tensile strength, yield strength, elongation, hardness), and a statement of conformity to the relevant material standard (e.g., EN-GJS-400-18/EN-GJS-500-7).
Q: Is this valve suitable for throttling or flow control?
A: No. Gate valves are designed for fully open or fully closed service. Using them for throttling can cause vibration, cavitation, and rapid wear of the seating surfaces, leading to leakage.
Q: What flange standards are available?
A: We can manufacture valves with flanges to common international standards such as DIN, ANSI (ASME B16.5), BS, and JIS. Please specify your required standard and pressure class when inquiring.
Q: Do you offer actuators for this valve?
A: While the standard is handwheel operation, this valve can be fitted with electric, pneumatic, or hydraulic actuators upon request. The valve design is compatible for adding an actuator bracket.
Q: What is the lead time for an order of DN300 marine gate valves?
A: Lead time depends on order quantity and configuration (trim materials, flange standard). For standard configurations, typical lead time is 4-8 weeks. We provide accurate timelines upon receipt of your detailed inquiry.
Q: Can you provide valves with specific certifications like ABS, DNV, or Lloyd's?
A: We can arrange for third-party inspection and certification by major marine classification societies. This service is available upon request and may involve additional costs and time. Please inform us of your specific certification requirements.