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As a specialized manufacturer with a strong export presence, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to introduce our robust Low-Temperature Carbon Steel Marine Ball Valve, engineered specifically for the demanding conditions of offshore cryogenic service. Since our establishment in 2016, we have focused on delivering reliable fluid control solutions to global markets, including North America, Southeast Asia, and Europe. This valve is a testament to our commitment, designed to maintain exceptional performance and sealing integrity in environments as cold as -196°C, making it an ideal choice for LNG handling, offshore platforms, and other critical cryogenic applications.
Our valve is meticulously crafted from specially selected low-temperature carbon steel, which retains its toughness and ductility even under extreme thermal stress, preventing brittle fracture—a common failure point in standard valves. The design incorporates several critical features to ensure safe and efficient operation:
- Extended Bonnet & Stem Design: A long, insulated bonnet protects the stem packing and actuation mechanism from the direct flow of cryogenic fluid, preventing ice formation and ensuring smooth operation.
- Anti-Static Device: Integrated springs ensure electrical continuity between the ball and stem, preventing dangerous static charge buildup when handling non-conductive fluids.
- Fire-Safe Construction: The valve is designed with secondary metal seals that engage in the event of a fire, maintaining a seal even if the primary soft seals (like PTFE) are compromised. Compliance with standards like API 607 is a key feature.
- Blow-Proof Stem: The stem is securely retained under pressure, providing an extra layer of safety in high-pressure cryogenic systems.
- Low-Temperature Seats: We offer a range of seat materials, including reinforced PTFE and specialized polymers, which remain flexible and provide a tight seal at cryogenic temperatures.
The technical specifications are tailored for marine and offshore use, ensuring compatibility with international standards and ease of integration into existing systems.
| Parameter | Specification |
|---|---|
| Body Material | LCC, LCB, or other ASTM A352 Gr. grades |
| Temperature Range | -196°C (-320°F) to +80°C (+176°F) |
| Pressure Class | ANSI Class 150, 300, 600, 900, 1500, 2500 (Customizable) |
| Port Type | Full Port (Full Bore) or Reduced Port (Standard Port) |
| End Connection | RF Flange, RTJ Flange, NPT Thread, BW (Butt Weld) |
| Ball Material | Stainless Steel (316SS), Chrome Plated, or with special coatings |
| Stem Material | Stainless Steel with blow-out proof design |
| Seat Material | PTFE, RPTFE, PEEK, Nylon, Metal (upon request) |
| Operation | Lever, Gear Operator, Pneumatic Actuator, Electric Actuator |
| Design & Test Standards | API 6D, API 598, BS 5351, ISO 17292 |
The advantages of choosing our valve translate directly into operational benefits for your project:
- Enhanced Safety: The combination of fire-safe design, anti-static features, and blow-proof stem minimizes risks in hazardous offshore environments.
- Reliable Sealing: Advanced seat materials and precise machining ensure zero leakage, crucial for expensive and volatile cryogenic media like LNG.
- Long Service Life: The use of impact-tested low-temperature materials reduces maintenance frequency and total cost of ownership, even with thermal cycling.
- Operational Flexibility: Available with various actuation options (manual, pneumatic, electric), it can be integrated into automated control systems on modern vessels and platforms.
- Global Compliance: Manufactured under an ISO9001 certified quality management system, our valves are designed to meet major international marine and industrial standards, facilitating approval processes.
Backed by our annual export value of US$1-1.5 Million and a proven track record of supplying to diverse and demanding markets from Eastern Europe to Oceania, you can trust Shanghai Zhibang as a reliable partner. Our strategic location with multiple shipment ports (Shanghai, Guangzhou, Hong Kong, Beijing) ensures flexible and efficient logistics. This valve is not just a component; it's a critical investment in the safety and efficiency of your cryogenic operations. For detailed quotations, custom specifications, or to discuss your specific application requirements, please contact our engineering team today.
Frequently Asked Questions (FAQ)
Q1: What exactly qualifies as "cryogenic service" for this valve?
A: In valve terminology, "cryogenic service" typically refers to applications involving fluids at temperatures below -46°C (-50°F). Our valve is specifically engineered and tested for extreme services down to -196°C, which covers liquefied natural gas (LNG), liquid nitrogen, liquid oxygen, and other industrial gases.
Q2: Can this valve be used for both liquid and gas phases in cryogenic systems?
A: Yes, it is designed to handle both phases. However, it is crucial to specify the exact service conditions (pressure, temperature, fluid) during inquiry so we can recommend the most suitable trim materials (seat, stem seals) to ensure optimal performance and longevity.
Q3: How does the extended bonnet design benefit the operation?
A: The extended bonnet creates a thermal barrier. It moves the stem packing and operating mechanism away from the super-cold valve body, preventing the packing from freezing solid. This ensures the valve can be operated smoothly at any time, a critical safety feature in emergency situations.
Q4: Are these valves suitable for submerged or seawater exposure on offshore platforms?
A: The standard valve body is low-temperature carbon steel. For direct seawater splash zone or submerged service, additional corrosion protection like specialized coatings (epoxy, etc.) or specifying a different body material (e.g., stainless steel) is recommended and available upon request.
Q5: What is the lead time for standard sizes and configurations?
A: Lead times vary based on size, pressure class, and actuation type. Standard flanged valves in common sizes (2" to 12") often have shorter lead times. We provide accurate delivery schedules upon receipt of detailed specifications.
Q6: Do you provide actuation packages, and are they suitable for hazardous areas?
A> Yes, we can supply complete packages with pneumatic (double-acting or spring-return) or electric actuators. Actuators suitable for hazardous areas (with ATEX, IECEx, or other certifications) can be sourced and assembled. Please specify your area classification requirements.
Q7: How do you ensure the quality and performance of the valve for such critical service?
A> Every valve undergoes a stringent quality process under our ISO9001 system. This includes material certification, impact testing of body materials at low temperatures, shell and seat pressure tests (often with helium for leak detection), and functional operation tests. Full test reports are available.
Q8: Can the valve be repaired or maintained on-site, and do you offer spare parts?
A> The design allows for in-line maintenance in many cases. We provide a comprehensive set of spare parts kits (seats, seals, stems) and detailed maintenance manuals. Our technical support is available to guide on-site procedures if needed.
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