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As a leading manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in engineering robust fluid control solutions for demanding global markets. Our Low Temperature Ball Valve with Extended Stem is a testament to our commitment, designed specifically to ensure reliable, leak-free operation in the harsh environments of marine piping systems handling cryogenic media like LNG and LPG at temperatures as low as -196°C. This valve is engineered not just to meet specifications but to provide peace of mind, offering superior performance that enhances safety and reduces maintenance costs for shipbuilders, offshore operators, and gas handling facilities worldwide.
The core innovation of this valve lies in its extended stem and bonnet assembly. In cryogenic service, a standard valve stem can transfer extreme cold to the external environment and packing area, leading to potential icing, seal failure, and operational hazards. Our extended design creates an insulating air chamber, effectively isolating the stem packing from the ultra-low process temperature. This critical feature ensures the valve remains operable and maintains its sealing integrity even under prolonged exposure to deep cryogenic conditions.
Key Features & Technical Advantages:
- Superior Cryogenic Performance: Precision-machined components and specialized materials prevent thermal contraction issues, guaranteeing bubble-tight shut-off at -196°C.
- Extended Insulated Bonnet: The extended neck minimizes heat transfer, preventing ice formation on the operating mechanism and protecting stem seals.
- Robust Construction: Manufactured from high-grade stainless steel (typically 316/CF8M) for excellent strength and corrosion resistance in marine atmospheres.
- Versatile Sealing Options: Seats are available in PTFE or reinforced PTFE, providing low torque operation and reliable sealing across the entire temperature range.
- Multiple Actuation Methods: Compatible with manual lever, gear operators, or pneumatic actuators, offering flexibility for remote or automated control systems.
- Fire-Safe Design (Optional): Available with fire-safe features where required, providing an extra layer of safety in case of emergency.
Technical Specifications:
| Parameter | Details |
| Design Standard | API 6D, BS 5351, ISO 17292 |
| Temperature Range | -196°C to +80°C |
| Pressure Rating | Class 150, 300, 600 (PN16 to PN100) |
| Size Range | DN15 (1/2") to DN300 (12") |
| Body Material | Stainless Steel 316, CF8M, LCC |
| End Connection | RF Flange, Threaded (NPT/BSP), Butt Weld |
| Leakage Class | Class VI (Soft Seat) per API 598 / ISO 5208 |
Benefits for Your Operations:
- Enhanced Safety: Reliable performance prevents leaks and valve seizure, crucial for handling flammable or hazardous cryogenic fluids on vessels.
- Reduced Maintenance: The extended stem design drastically lowers the risk of packing failure and ice-related damage, leading to lower lifecycle costs.
- Operational Reliability: Ensures continuous flow control in critical LNG/LPG transfer, storage, and fuel gas supply systems.
- Global Compliance: Manufactured under ISO9001, designs align with international marine and industrial standards for wide acceptance.
With an annual export value between US$1-1.5 Million and a strong presence across North America, Europe, Southeast Asia, and other key global markets, Shanghai Zhibang has proven its capability to deliver quality valves that meet diverse international requirements. Our valves ship from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring efficient logistics. Choosing our Low Temperature Ball Valve means partnering with a dedicated manufacturer whose products are built for endurance in the world's most challenging marine applications. Contact us today to discuss how this valve can be integrated into your piping system for secure and efficient cryogenic service.
Frequently Asked Questions (FAQ)
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Q: Why is an extended stem necessary for a cryogenic ball valve?
A: An extended stem (or bonnet) creates a thermal barrier. It prevents the extreme cold (-196°C) from the process fluid from reaching the stem packing and external operating mechanism. This prevents ice formation, ensures the valve remains operable, and significantly extends the life of the stem seals. -
Q: What materials are suitable for the valve body at -196°C?
A: Austenitic stainless steels like SS316, CF8M, or Low Carbon Content (LCC) grades are commonly used. These materials retain good impact toughness and ductility at cryogenic temperatures, preventing brittle fracture. -
Q: Can this valve be used for both LNG and LPG services?
A: Yes, it is designed for a wide range of cryogenic hydrocarbon services, including Liquefied Natural Gas (LNG) and Liquefied Petroleum Gas (LPG). The specific material and seat selection can be tailored to the exact fluid and operating conditions. -
Q: What types of end connections are available?
A: We offer various connections to suit different piping standards: Raised Face (RF) flanges per ANSI/ASME, threaded ends (NPT or BSP), and butt weld ends for permanent, leak-free installations. -
Q: Is the valve operable during and after exposure to cryogenic temperatures?
A: Absolutely. The extended stem design is key here. It ensures the operating mechanism (lever, gear, or actuator) remains at a temperature where it can function smoothly, both during operation and after the system is cooled down or warmed up. -
Q: Do you offer actuated versions for remote operation?
A: Yes. The valve can be equipped with pneumatic, electric, or hydraulic actuators as per request. This is essential for automated marine systems or valves installed in hard-to-reach locations. -
Q: What certifications does the valve have?
A: Our manufacturing facility is certified to ISO9001 for quality management. Specific product certifications like CE PED, ABS, DNV, or others can be provided upon request and are subject to project requirements. -
Q: What is the typical delivery lead time?
A: Lead times vary based on size, material, and quantity. Standard configurations typically have shorter lead times. Please contact our sales team with your specifications for an accurate delivery schedule.
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