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As a professional manufacturer with a strong commitment to quality and reliability, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our CBT4303 Bronze Check Valve. Engineered specifically for demanding marine applications, this valve is built to prevent backflow and protect critical piping systems onboard vessels and offshore platforms. With our ISO9001 certified manufacturing processes and years of experience serving global maritime markets, we deliver a product that combines robust construction with precise performance, ensuring smooth operation and long service life in corrosive seawater environments.
The Bronze ASTM B62 Check Valve CBT4303 is a cornerstone of reliable marine fluid control. Its wafer design allows for compact installation between ANSI flanges, saving valuable space and weight—a critical factor in ship design. Crafted from ASTM B62 bronze alloy, known for its excellent resistance to seawater corrosion and dezincification, this valve is engineered to withstand the harsh conditions of marine service. The swing-type disc ensures low-pressure drop during forward flow and provides quick, positive sealing against reverse flow, safeguarding pumps, compressors, and other equipment from potential damage.
Key Features & Technical Advantages:
- Superior Corrosion Resistance: The ASTM B62 bronze composition offers proven performance against seawater, brackish water, and other corrosive fluids common in marine operations.
- Space-Saving Wafer Design: Installs directly between pipe flanges without the need for additional flange bolting, resulting in a lighter, more compact assembly compared to flanged-end check valves.
- Reliable Swing Disc Mechanism: The hinged disc swings open with forward flow and closes securely under backflow conditions, providing dependable one-way flow control.
- Reduced Pressure Loss: The streamlined internal passage and full-port design minimize flow resistance, contributing to energy efficiency in piping systems.
- Durable Construction: Precision-machined components and robust assembly ensure reliable operation under vibration and varying pressure conditions encountered at sea.
- Versatile Application: Suitable for a wide range of marine services including seawater cooling lines, ballast systems, fire mains, bilge lines, and general service piping.
Detailed Technical Specifications:
| Parameter | Specification |
| Product Model | CBT4303 |
| Body Material | ASTM B62 Bronze Alloy |
| Disc & Seat Material | Bronze (Standard), Optional Buna-N or Viton Seats |
| Design Type | Wafer Style, Swing Check |
| Connection | Fits between ANSI 150/300 lb RF Flanges |
| Pressure Rating | PN16 / Class 150 (CWP 1.6 MPa / 232 psi) |
| Temperature Range | -20°C to 150°C (-4°F to 302°F) with standard seat |
| End-to-End Dimensions | Complies with API 594 / MSS SP-67 standards |
| Suitable Media | Seawater, Fresh Water, Oil, Gas, Non-aggressive Chemicals |
Benefits for Your Marine Operations:
- Enhanced System Protection: Prevents reverse flow that can damage pumps, cause water hammer, or disrupt system processes.
- Reduced Maintenance: The corrosion-resistant bronze construction and reliable design lead to fewer failures and lower lifecycle costs.
- Ease of Installation & Maintenance: The wafer design simplifies installation between existing flanges, and the valve can often be serviced in-line.
- Compliance with Marine Standards: Manufactured from materials and to designs commonly specified for marine and offshore applications.
- Global Supply Support: With annual exports valued between US$1-1.5 million and shipment capabilities from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely delivery to shipyards and marine projects worldwide.
Trust in a product backed by Shanghai Zhibang Valve's manufacturing expertise since 2016. Our ISO9001 quality management system underpins every stage of production, from material selection to final testing, ensuring consistency and reliability. We have successfully supplied valves to diverse markets across North and South America, Europe, Asia, Africa, and Oceania, proving our capability to meet international maritime requirements. For a durable, space-efficient, and reliable solution for your marine piping backflow prevention needs, the Bronze ASTM B62 Check Valve CBT4303 represents a sound investment. Contact us today for pricing, detailed specifications, or to discuss custom requirements for your specific application.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a wafer-style check valve over a flanged-end style?
A: The primary advantage is space and weight savings. A wafer valve installs between two existing pipe flanges, using their bolts, eliminating the need for its own flange pair. This results in a shorter, lighter assembly, which is highly beneficial in space-constrained marine environments.
Q2: Why is ASTM B62 bronze specified for marine valves?
A: ASTM B62 bronze (also known as 85-5-5-5 alloy) is renowned for its excellent resistance to corrosion by seawater and dezincification. It maintains its strength and integrity in saline environments, making it a preferred and often specified material for marine fittings and valves.
Q3: Can this valve be used with fluids other than water?
A: Yes, while optimized for seawater and fresh water service, the CBT4303 is suitable for a range of non-aggressive media including oils, gases, and certain chemicals. Compatibility for specific media should be confirmed based on temperature, concentration, and seat material selection.
Q4: What is the cracking pressure for this swing check valve?
A: The cracking pressure (the minimum upstream pressure required to open the disc) is relatively low, typically in the range of 0.5 to 2 psi (0.03 to 0.14 bar), depending on the specific size and spring assist (if applicable). This allows it to open easily under normal flow conditions.
Q5: Is this valve suitable for vertical pipe installation?
A: Swing check valves are generally recommended for horizontal pipe runs where the disc can swing freely. For vertical upward flow, a spring-assisted disc or a different check valve type (like a piston check) might be more suitable. Consult our technical team for vertical installation guidance.
Q6: Do you offer different seat materials for different service conditions?
A: Absolutely. While the standard seat is bronze, we can often provide alternative soft seat materials like Buna-N (Nitrile) or Viton (FKM) upon request. These can offer better sealing for certain media or provide a tighter seal with lower leakage rates.
Q7: How does your company ensure quality control?
A: Our manufacturing operates under an ISO9001 Quality Management System. This encompasses controlled material sourcing, documented production processes, in-process inspections, and final performance testing (such as shell tests and seat tests) to ensure each valve meets its specified design and performance criteria.
Q8: What are your main shipping ports and lead times?
A: We ship regularly from major Chinese ports including Shanghai, Guangzhou, Hong Kong, and Beijing. Lead times vary based on order quantity and valve size, but we maintain efficient production scheduling to meet project timelines for our global clientele in the marine industry.
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