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Large Bore Marine Trunnion Ball Valve With Blow-Proof Stem, DN150-DN300 Range
Product Spotlights
Large bore trunnion ball valves (DN150-DN300) featuring a critical blow-proof stem for marine safety. Designed for high-pressure, large-flow applications with low torque operation, reduced seat wear, and optional fire-safe certification. Offers durable construction, versatile material options (carbon steel to duplex), and easy actuator retrofitting for reliable, long-life performance in demanding offshore and industrial environments.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Application:
Other, Marine
Valve Type:
Trunnion Mounted Ball Valve
Size Range:
DN150 to DN300
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Application
Other, Marine
Valve Type
Trunnion Mounted Ball Valve
Size Range
DN150 to DN300
Stem Design
Blow-Proof, Anti-Blowout
Connection Type
Flanged (Standard), Optional End Types Available
Body Material
Carbon Steel, Stainless Steel, Duplex Stainless Steel
Seat Material
PTFE, Reinforced PTFE, Metal Seated Options
Pressure Rating
Class 150, Class 300, Class 600
Operation
Manual Gearbox, Pneumatic Actuator, Electric Actuator
As a professional valve manufacturer established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to introduce our robust Large Bore Marine Trunnion Ball Valve with Blow-Proof Stem. Designed specifically for demanding marine, offshore, and industrial pipeline applications, this valve series combines superior safety, reliability, and long service life. Our commitment to ISO9001 certified manufacturing processes ensures every valve meets stringent quality standards, providing our global clients in markets from North America to Southeast Asia with a dependable solution for critical fluid control systems.
The core value of this valve lies in its enhanced safety features and durability under high-pressure, large-flow conditions. The integrated blow-proof stem design is a critical safety component that prevents stem ejection under extreme pressure, protecting personnel and equipment. Combined with the trunnion-mounted ball, which reduces operating torque and minimizes seat wear, this valve is engineered for performance in the toughest environments, from shipboard systems to onshore terminals.
Key Features and Technical Advantages:
- Blow-Proof Stem Mechanism: Features a unique stem retention system that securely locks the stem in place, preventing accidental blowout even if the packing gland is loosened or under sudden pressure surges. This is a vital safety feature for marine applications.
- Trunnion-Mounted Ball Design: The ball is supported by trunnions (shafts) at the top and bottom, which significantly reduces the operating torque compared to floating ball designs. This design also isolates the seat from the line pressure, leading to reduced seat wear and longer service life.
- Fire-Safe Design (Optional): Available with fire-safe API 607/API 6FA compliant seats and seals. In case of fire, the secondary metal seat provides a seal, preventing catastrophic fluid release.
- Double Block and Bleed (DBB) Function: In the closed position, the valve provides a tight seal on both sides of the ball. A bleed port allows pressure between the seats to be safely vented, verifying the seal integrity—a crucial feature for pipeline isolation and maintenance.
- Low Maintenance & Extended Life: The robust construction and anti-wear features, such as reinforced seat materials and chrome-plated ball surfaces, minimize maintenance needs and extend the valve's operational lifespan, reducing total cost of ownership.
- Versatile Actuation Options: Can be easily fitted with manual gear operators, pneumatic actuators, or electric actuators for remote and automated control, facilitating integration into modern control systems.
Technical Specifications:
| Parameter | Specification |
| Valve Size (Nominal Diameter) | DN150, DN200, DN250, DN300 (6", 8", 10", 12") |
| Pressure Class | Class 150 (PN16/20), Class 300 (PN50), Class 600 (PN100) - Available upon request |
| Body Material | WCB (A216 Gr.WCB), CF8M (A351 Gr.CF8M), Duplex Stainless Steel |
| Ball & Stem Material | Chrome Plated A105/SS304/SS316, Duplex Steel |
| Seat Material | Standard: PTFE (RPTFE). Optional: Deva, PEEK, Metal Seated (for fire-safe) |
| End Connection | RF Flanged (ASME B16.5, DIN, JIS, GB standards), BW ends customizable |
| Temperature Range | Standard: -29°C to +200°C. Extended ranges available with special seat materials. |
| Operation | Lever, Gearbox, Pneumatic Actuator, Electric Actuator |
Benefits for Your Operation:
- Enhanced Safety Compliance: The blow-proof stem directly addresses safety regulations in marine and hazardous area applications, helping you meet industry safety standards.
- Reduced Operational Risk: Reliable sealing and robust construction minimize the risk of leaks or failures, ensuring continuous operation and protecting valuable assets.
- Lower Lifetime Costs: High durability and low maintenance requirements translate into significant savings on repair, replacement, and downtime over the valve's lifespan.
- Operational Flexibility: Suitable for a wide range of media including seawater, oil, gas, chemicals, and slurries, making it a versatile choice for various system requirements.
Shanghai Zhibang's expertise is backed by a solid track record, with an annual export value between US$1 Million and US$1.5 Million, serving a diverse global clientele across North America, South America, Europe, Asia, Africa, and Oceania. Our valves are shipped from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics. Choosing our Large Bore Marine Trunnion Ball Valve means partnering with a manufacturer committed to ISO9001 quality, proven reliability, and dedicated customer support. Contact us today to discuss your specific DN150-DN300 valve requirements and receive a competitive quotation tailored to your project.
Frequently Asked Questions (FAQ):
-
What is the primary advantage of a trunnion-mounted ball valve over a floating ball valve for large bore applications?
Trunnion-mounted design significantly reduces operating torque, especially important for large valves (DN150+). It also provides better seat sealing under high pressure and increases seat life by isolating the seat from direct line pressure. -
How does the "blow-proof stem" feature work, and why is it critical for marine use?
The stem incorporates a shoulder or a locking mechanism below the packing gland. If internal pressure tries to force the stem out, this feature mechanically blocks its path, preventing stem ejection—a crucial safety measure on ships where valve failure can have severe consequences. -
Can this valve be used for cryogenic services or high-temperature applications?
The standard temperature range is -29°C to +200°C. For cryogenic services (e.g., LNG) or higher temperatures, special seat materials (like PEEK or metal), extended stem designs, and appropriate material certifications can be provided upon request. -
What actuation options are available, and can the valve be automated later?
Valves are supplied with a manual lever or gearbox as standard. They are designed with standardized mounting pads, allowing for easy retrofitting of pneumatic or electric actuators in the field for future automation needs. -
Are these valves suitable for seawater and other corrosive media?
Yes. We offer body materials like CF8M (316 Stainless Steel) and Duplex Stainless Steel, which provide excellent corrosion resistance for seawater, brackish water, and various chemical media. -
Do you provide fire-safe certified valves?
Yes, we can supply valves that comply with fire-safe testing standards such as API 607/API 6FA. These include secondary metal seats that maintain a seal in the event of a fire. Please specify this requirement during inquiry. -
What is the typical lead time for an order of DN200 valves?
Lead times vary based on material specifications, pressure class, and quantity. Generally, for standard materials and common pressure classes, production lead time is approximately 6-8 weeks. We provide precise schedules upon order confirmation. -
What standards do your flanges comply with?
Our valves are manufactured with flanges compliant with ASME B16.5 (ANSI) as standard. Flanges meeting DIN, JIS, GB, or other international standards are available as a customization option.
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1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
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