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Home > Industrial Equipment & Components > Valve > Gate Valve > GB/T Marine Gate Valve DN50 DN150 High Temperature Steam DNV LR Approved

GB/T Marine Gate Valve DN50 DN150 High Temperature Steam DNV LR Approved

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GB/T Marine Gate Valve DN50 DN150 High Temperature Steam DNV LR Approved photo-4

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Product Spotlights

DNV & LR approved marine gate valve for reliable high-temperature steam isolation. Manufactured to GB/T standards in sizes DN50-DN150. Features robust construction, high-pressure capability (PN16/25/40), and temperature resistance up to 425°C. Ideal for shipboard steam systems, ensuring safety, compliance, and long service life with global shipping support.

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

Key Specifications

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Product Type:

Marine Gate Valve

Design Standard:

GB/T

Nominal Diameter (DN):

DN50 to DN150

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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
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Product Type Marine Gate Valve

Design Standard GB/T

Nominal Diameter (DN) DN50 to DN150

Service Medium High Temperature Steam

Approval/Certification DNV LR Approved

Connection Type Flanged (Standard)

Body Material Cast Steel/Carbon Steel

Pressure Rating PN16, PN25 (Common)

Temperature Range Up to 425°C (Max)

Operation Type Handwheel, Gear (Optional)

As a specialized manufacturer with a strong focus on marine and industrial valves, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our GB/T standard Marine Gate Valve series, designed specifically for demanding high-temperature steam applications. Engineered to meet the rigorous standards of maritime operations and backed by DNV and LR approvals, this valve series from DN50 to DN150 represents our commitment to reliability, safety, and performance in critical fluid control systems. With our ISO9001-certified manufacturing processes and a decade of industry experience since 2016, we deliver valves that shipowners, shipyards, and marine engineers can trust for long-term, trouble-free service.

Our Marine Gate Valves are constructed to provide a tight seal and full, unobstructed flow when open, making them ideal for on/off service in steam lines aboard vessels. The robust design ensures they can withstand the high pressures and thermal stresses associated with shipboard steam systems, including those for heating, auxiliary power, and cargo handling.

Key Features & Technical Advantages:

Rugged Construction for Marine Environment: The valve body and internal components are made from materials selected for excellent corrosion resistance and mechanical strength in salty, humid conditions. Special surface treatments and coatings are available upon request for enhanced durability.
High-Temperature & High-Pressure Capability: Specifically engineered for steam service, the valve features a design that accommodates thermal expansion, utilizes high-grade gasket materials like spiral-wound gaskets with graphite filler, and employs a stem packing suitable for elevated temperatures to prevent leaks.
Reliable Sealing Performance: The wedge or parallel slide disc design ensures a bubble-tight seal when closed, critical for safety and efficiency in steam systems. The sealing surfaces are often hard-faced or treated to resist erosion and wear from high-velocity steam.
Easy Operation and Maintenance: Designed with maintenance in mind. The standard handwheel operation provides clear indication of valve position. For larger sizes or higher pressures, gearbox operators are available to reduce required operating torque. A yoke design often allows for in-line packing replacement without removing the valve from the line.
Full Compliance with Marine Standards: Manufactured in accordance with GB/T (Chinese National Standard) which aligns with international norms for dimensions and pressure ratings. The DNV and LR approvals provide independent verification that the valves meet the specific rules and requirements of these leading marine classification societies for materials, design, testing, and workmanship.

Detailed Technical Specifications (Typical):

Parameter	Specification / Range
Nominal Size (DN)	50, 65, 80, 100, 125, 150
Pressure Rating (PN)	PN16, PN25, PN40 (Customizable)
Design & Test Standard	GB/T 12234, GB/T 13927
Face-to-Face Dimension	As per GB/T 12221 (Short Pattern or Long Pattern)
Flange Standard	GB/T 9113 (JIS, ANSI, DIN available)
Max. Working Temperature	Up to 425°C (797°F) for Carbon Steel body
Body Material (Common)	WCB (A216), LCB (Low Temp), CF8/CF8M (Stainless)
Trim Material (Sealing)	13Cr/Stellite faced, 304/316, Alloy 20 (Optional)
Stem Material	13Cr, 17-4PH, 304/316 Stainless Steel
Packing Material	Graphite (High-Temp), PTFE, Flexible Graphite
Operation	Handwheel (Standard), Gear Operator (for DN≥100/High Pressure)

Benefits for Your Project:

Ensures Regulatory Compliance: The DNV and LR approval certificates facilitate smoother vessel classification, surveys, and port state controls, reducing administrative hurdles and potential downtime.
Enhances System Safety and Reliability: Robust construction and rigorous testing minimize the risk of failures in critical steam systems, protecting personnel, cargo, and the vessel itself.
Reduces Lifecycle Costs: Durable materials and reliable sealing translate to longer service intervals, fewer replacements, and lower maintenance costs over the valve's lifetime.
Provides Sourcing Flexibility: Available in a range of common marine sizes (DN50-DN150), these valves can serve as reliable components for new builds, retrofits, or spare part inventories.
Offers Global Supply Chain Support: With shipment capabilities from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely delivery to shipyards and repair docks worldwide.

Trust in a manufacturer with a proven global footprint. Shanghai Zhibang Valve has consistently supplied quality valves across diverse markets including North America, Europe, Southeast Asia, and the Middle East, with an annual export value reflecting strong international client trust. Our ISO9001 certification underpins every stage of production, from material sourcing to final testing, ensuring consistent quality that meets exacting specifications. For your next marine project requiring dependable, class-approved valves for high-temperature steam service, choose a partner dedicated to maritime excellence. Contact us today for detailed quotations, technical data sheets, or to discuss custom requirements for your specific application.

Frequently Asked Questions (FAQ):

Q: What is the significance of DNV and LR approval for this valve?
A: DNV (Det Norske Veritas) and LR (Lloyd's Register) are leading international marine classification societies. Their approval means the valve has been designed, manufactured, and tested in accordance with their specific rules and standards for marine use. This is often a mandatory requirement for valves installed on classed vessels, ensuring they meet recognized safety, quality, and performance benchmarks for maritime applications.
Q: Can this valve be used for services other than steam?
A: While specifically designed and optimized for high-temperature steam, this gate valve series, depending on the selected trim materials, can also be suitable for other media such as oil, fuel, non-aggressive chemicals, and seawater (with appropriate material grades like stainless steel). It is crucial to consult with our engineers to confirm suitability for your specific medium, temperature, and pressure.
Q: Are the flanges compatible with international standards like ANSI or JIS?
A: The standard offering complies with GB/T flange standards, which have dimensional compatibility with many international standards. However, we can supply valves with flanges machined to ANSI, JIS, DIN, or other standards upon request to ensure a perfect fit with your existing piping system.
Q: What is the typical delivery lead time for an order of DN100 valves?
A: Lead times vary based on order quantity, specific material requirements, and production schedule. For standard configurations in carbon steel (WCB) with DNV/LR approval, typical lead times range from 4 to 8 weeks. We provide accurate lead time estimates with every formal quotation.
Q: Do you provide certification documents with the valves?
A: Yes. Each batch of DNV/LR approved valves is supplied with the relevant Material Certificates (3.1/3.2 as per EN 10204), Test Certificates documenting hydrostatic and shell tests, and copies of the relevant DNV/LR type approval certificates. These documents are essential for class surveys and vessel documentation.
Q: Is the valve suitable for both normally open and normally closed service?
A: Gate valves are generally designed for infrequent operation as isolation valves, either fully open or fully closed. They are suitable for both duties. However, for services requiring frequent cycling, other valve types like globe valves might be more appropriate. For steam isolation, they perform reliably in either role.
Q: What kind of after-sales support do you offer?
A: We provide comprehensive technical support, including installation guidance and maintenance recommendations. We also maintain a stock of common spare parts like gland packing, gaskets, and handwheels to support our clients' maintenance needs and minimize vessel downtime.
Q: Can you customize the valve, for example, with a different stem material or extended bonnet?
A: Absolutely. As a manufacturer, we offer a high degree of customization. This includes alternative materials for body, trim, and stem; different types of operators (gear, electric, pneumatic); extended bonnets for insulation or cold applications; and special coatings. Please provide your detailed specifications for a customized solution.