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Help CenterCB/T3191 Marine Ball Valve For Seawater, 316L Stainless Steel, Extended Stem, PN16
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As a specialized manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance CB/T3191 Marine Ball Valve. Engineered specifically for demanding seawater applications, this valve combines the superior corrosion resistance of 316L stainless steel with a robust extended stem design, making it a reliable solution for shipbuilding, offshore platforms, and coastal infrastructure. With an annual export value reflecting our global reach across markets from North America to Oceania, we understand the critical need for durability and compliance in marine environments. Our valve is built to withstand the harsh conditions of seawater service while ensuring smooth operation and long-term sealing integrity.
This marine ball valve is designed to meet the exacting standards required for fluid control in seawater systems. Its construction and features address the common challenges of corrosion, biofouling, and pressure fluctuations encountered at sea.
- Superior Corrosion Resistance: The valve body, ball, and stem are constructed from 316L stainless steel, which offers enhanced resistance to pitting and crevice corrosion caused by chlorides in seawater, significantly outperforming standard 304 stainless steel in such environments.
- Extended Stem Design: The extended stem is a critical feature for marine applications. It allows for easy installation within insulated pipe lines or behind panels, providing a clear and accessible point for operation. This design also helps protect the stem packing from direct exposure to external elements.
- Robust Sealing System: Equipped with seats made from advanced polymers like PTFE or reinforced PTFE, the valve ensures a bubble-tight seal even after prolonged periods of inactivity. The seat design minimizes friction during operation and extends service life.
- Compliant Design: Manufactured in accordance with the CB/T3191 standard, this valve meets specific Chinese marine industry specifications for dimensions, pressure ratings, and testing, ensuring compatibility and reliability in marine engineering projects.
- Versatile Operation: The valve can be fitted with a standard lever handle for quick quarter-turn operation or an optional gearbox for applications requiring higher torque or remote operation capabilities.
- Full Port Design (Typical): Our marine ball valves typically feature a full port (full bore) design, which minimizes pressure drop across the valve and allows for the passage of pipeline pigs or reduces flow turbulence, which is crucial for efficient seawater system performance.
The technical specifications of the CB/T3191 Marine Ball Valve are detailed below:
| Parameter | Specification |
|---|---|
| Product Standard | CB/T3191 |
| Pressure Rating | PN16 (16 bar) |
| Body Material | 316L Stainless Steel (CF3M) |
| Ball Material | 316L Stainless Steel, Chrome Plated optional |
| Stem Material | 316L Stainless Steel, Extended Type |
| Seat Material | PTFE, Reinforced PTFE (RPTFE), or other polymers upon request |
| Stem Seals | Graphite or PTFE based packing, adjustable |
| Connection | Flanged as per CB/T3191, RF face |
| Operation | Lever Handle (Standard), Gearbox Operator (Optional) |
| Temperature Range | -20°C to +180°C (dependent on seat material) |
| Applicable Fluid | Seawater, Saltwater, Brine, other corrosive media |
The primary advantages of choosing this valve translate directly into benefits for shipyards, marine engineers, and operators. The use of 316L material reduces maintenance frequency and replacement costs associated with corrosion failure. The extended stem simplifies installation and routine maintenance checks. Compliance with the CB/T3191 standard ensures product acceptance in many marine projects and provides assurance of quality and dimensional interoperability. The reliable sealing performance prevents leaks, protecting sensitive equipment and maintaining system efficiency.
Backed by our ISO9001 certified manufacturing processes established in 2016, Shanghai Zhibang Valve delivers products that meet consistent quality standards. Our annual export value of US$1-1.5 Million and presence in major global markets including North America, Southeast Asia, Europe, and Africa testify to the international trust in our marine valves. We support this with flexible shipping from key ports like Shanghai, Guangzhou, and Hong Kong. For your next seawater, ballast, cooling, or fire-fighting system project, choose a valve built for the challenge. Contact us today for detailed quotations, technical data sheets, or to discuss custom requirements for your specific application.
Frequently Asked Questions (FAQ)
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Q: What is the main advantage of 316L stainless steel over 304 for this marine valve?
A: 316L contains molybdenum, which greatly enhances its resistance to pitting and crevice corrosion in chloride-rich environments like seawater. This makes it significantly more durable and reliable for long-term marine service compared to 304 stainless steel. -
Q: When is an extended stem necessary?
A: An extended stem is essential when the valve needs to be installed within insulated piping, behind bulkheads, or in locations where the operating mechanism must be raised to an accessible level. It is a common requirement in ship engine rooms and offshore platform piping. -
Q: Can this valve be used for fluids other than seawater?
A: Yes. While optimized for seawater, its 316L construction and PTFE seats make it suitable for a wide range of other corrosive media, including various chemicals, brines, and certain acids, within its pressure and temperature ratings. -
Q: What does the "PN16" pressure rating mean?
A: PN16 indicates a nominal pressure rating of 16 bar at ambient temperature (typically 20°C). This is the maximum allowable working pressure the valve is designed to handle continuously under standard conditions. -
Q: Are different end connections available?
A: The standard connection is flanged as per the CB/T3191 standard. Other connection types like threaded (NPT, BSP) or welding ends may be available as a customization option. Please inquire with our sales team for specific requirements. -
Q: Is a locking device available for this valve?
A: Yes. Locking devices or padlock provisions for the lever handle are often available as an accessory to secure the valve in the open or closed position, which is important for safety and procedure compliance. -
Q: What kind of maintenance does this ball valve require?
A: Maintenance is minimal. Periodic checks of the stem packing for leaks and occasional operation to prevent seat sticking are recommended. The stem packing gland is adjustable to compensate for minor wear. -
Q: Do you offer actuated versions of this valve?
A: Yes. This extended stem ball valve can be fitted with pneumatic, electric, or hydraulic actuators for automated remote control. Actuator selection depends on the available power source and required torque.
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