CB Marine Valve
Engineered to withstand the harshest conditions at sea, the CB T3944 Stainless Steel Check Valve is the pinnacle of reliability for cryogenic marine applications and aggressive chemical processing. Designed to handle extreme media including liquefied gases down to -160°C and highly corrosive acidic fluids, this valve ensures absolute system integrity where standard valves fail.
Constructed entirely from stainless acid-proof steel—including body, cover, disc, and even the fasteners—this valve series offers complete protection against galvanic corrosion, pitting, and chemical attack. Whether installed on an LNG carrier, a chemical tanker, or an offshore processing platform, the CB T3944 delivers leak-tight, maintenance-free operation in the most challenging environments.
Designed for Extreme Service
From the ultra-low temperatures of liquid natural gas to the aggressive attack of sulfuric acid, this valve is purpose-built. Available in multiple pressure ratings (1.0 MPa, 1.6 MPa, 2.5 MPa) and sizes ranging from DN20 to DN125, it provides versatile, drop-in replacement capability for new builds and retrofits alike.
Key Features & Benefits
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✅ Cryogenic Service Capability (-160°C): Specially engineered materials and construction techniques ensure reliable sealing and mechanical integrity at ultra-low temperatures, making it ideal for LNG handling, ethylene, and other liquefied gases.
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✅ Full Stainless Acid-Proof Construction: Unlike valves with carbon steel components or standard stainless, this valve features complete corrosion-resistant materials, including stainless steel fasteners. This eliminates the risk of rust and ensures longevity in marine atmospheres.
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✅ Multiple Pressure Ratings for Versatility: Available in PN1.0, PN1.6, and PN2.5, allowing seamless integration into various system designs, from low-pressure return lines to high-pressure process circuits.
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✅ Comprehensive Marine Valve Series: Part of an integrated family of CB standard marine valves, including stop valves (CB T3942), stop check valves (CB T3943), and gate valves (CB T3955), ensuring consistent quality across your entire piping system.
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✅ Custom Material Options: For specialized extreme environments, special alloys and exotic metals are available upon request to meet unique chemical compatibility requirements.
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✅ Marine Certification Ready: Manufactured in compliance with CB marine standards, facilitating classification society approval (CCS, ABS, DNV, LR, etc.).
Material Composition
| Component | Standard Material | Key Properties |
|---|---|---|
| Body, Cover & Disc | Stainless Acid-Proof Steel | Superior resistance to corrosion, acids, and chlorides |
| Fasteners | Stainless Steel | Complete corrosion protection; prevents galling and seizing |
Product Series (Complementary Valves)
Build a complete, corrosion-resistant fluid control system with our full range of CB standard stainless steel valves:
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CB 3022-94 – Male Thread Air Signal Valve
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CB T3942 – Stainless Steel Stop Valve
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CB T3943 – Stainless Steel Stop Check Valve
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CB T3955 – Stainless Steel Gate Valve
Technical Specifications
| Parameter | Specification |
|---|---|
| Nominal Diameter (DN) | DN20 – DN125 |
| Pressure Ratings (PN) | 1.0 MPa / 1.6 MPa / 2.5 MPa |
| Temperature Range | -160°C to Elevated Temperatures |
| Design Standard | CB Marine Standards |
| Media Compatibility | Liquefied Gases (LNG, LPG, Ethylene), Corrosive Chemicals, Acidic Fluids, Seawater |
| Applications | Marine Chemical Processing, Gas Handling Systems, Offshore Platforms, Cryogenic Storage |
Dimension Tables
Type A & Type B (PN1.0 & PN2.5)
| PN (MPa) | DN (mm) | L | H | H1 | A | B | D | D1 | D2 | d0 | b |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.0 | 65 | 290 | 115 | 124 | 91 | 115 | 155 | 123 | 104 | 15 | 14 |
| 1.0 | 80 | 310 | 125 | 151 | 110 | 125 | 170 | 138 | 118 | – | – |
| 1.0 | 100 | 350 | 150 | 165 | 116 | 135 | 190 | 158 | 138 | – | – |
| 1.0 | 125 | 400 | 175 | 184 | 124 | 155 | 215 | 183 | 164 | – | – |
| 2.5 | 20 | 150 | 75 | 84 | 70 | 75 | 95 | 68 | 48 | 13 | 11 |
| 2.5 | 25 | 160 | 80 | 84 | 70 | 80 | 105 | 73 | 56 | 12 | – |
Type AS & Type BS (PN1.6 & PN2.5)
| PN (MPa) | DN (mm) | L | H | H1 | AS | BS | D | D1 | D2 | d0 | b |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.6 | 100 | 350 | 175 | 158 | 119 | 175 | 220 | 180 | 158 | 18 | 22 |
| 1.6 | 125 | 400 | 200 | 184 | 124 | 200 | 250 | 210 | 184 | – | – |
| 2.5 | 20 | 150 | 95 | 84 | 70 | 95 | 105 | 75 | 58 | 14 | 16 |
*Note: All dimensions are in millimeters. For complete dimensional data on all sizes (DN32-DN50, etc.), please contact our sales team.*
Applications
The CB T3944 is the preferred choice for critical services where material failure is not an option:
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LNG & Gas Carriers: Cryogenic piping systems for liquefied natural gas and petroleum gas.
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Chemical Tankers: Handling of corrosive cargoes, including acids, caustics, and solvents.
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Offshore Platforms: Seawater injection, chemical injection, and processing systems.
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FPSO & FLNG: High-integrity pressure protection and isolation services.
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Specialized Marine Systems: Fuel gas supply systems for dual-fuel engines.
Frequently Asked Questions (FAQs)
Q1: What makes this valve suitable for -160°C cryogenic service?
A: Standard valve materials can become brittle and fail at cryogenic temperatures. The CB T3944 is constructed from specially treated stainless acid-proof steel that retains its ductility and impact resistance down to -160°C. Furthermore, the design incorporates extended bonnets (as seen in the H/H1 dimensions) to position the gland packing away from the cold zone, ensuring it remains flexible and leak-free.
Q2: What is the difference between “stainless steel” and “stainless acid-proof steel”?
A: While all acid-proof steels are stainless, not all stainless steels are acid-proof. Standard 304 stainless steel offers good corrosion resistance but can be attacked by strong acids or chlorides. Stainless acid-proof steel (typically containing molybdenum, such as 316L or higher alloys) is specifically formulated to resist attack from a much wider range of aggressive chemical media, making it essential for marine chemical handling.
Q3: Can I use this check valve in vertical and horizontal pipelines?
A: Yes, this swing check valve design is versatile. However, for optimal performance and to ensure the disc closes properly by gravity, horizontal installation with the cover facing upward is generally recommended. For vertical installations, flow should be upward. Please consult our technical team for specific guidance on your application.
Q4: What do the different flange types (Type A, B, AS, BS) mean?
A: These designations refer to different flange facing and drilling patterns as specified by CB marine standards.
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Type A / Type AS typically refer to specific flange dimensions and sealing face configurations for different pressure classes and connection standards.
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Type B / Type BS follow similar logic but for alternative series.
It is crucial to match the valve type to your pipeline flanges. Our dimension tables provide the necessary data (D, D1, D2, d0) to ensure compatibility.
Q5: Does this valve come with classification society certification?
A: The valve is manufactured to CB Marine Standards, which are recognized globally. We can supply valves with certification to meet the requirements of major classification societies such as CCS, ABS, DNV, LR, BV, and RINA upon request. Please specify your certification needs when ordering to ensure proper documentation and material traceability.
Q6: What is the difference between the CB T3942 Stop Valve and the CB T3944 Check Valve?
A: The CB T3942 is a stop valve (globe valve) , which is used to start, stop, or regulate flow. It is manually operated via a handwheel. The CB T3944 is a check valve (non-return valve) , which is automatic. It allows flow in one direction only and closes automatically if flow reverses, protecting equipment like pumps from backflow damage. They are often used together in a system.
Attention please: The description was copied from different cooperating manufacturers. The description may be different with the goods, please check with us when order.
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