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As a leading manufacturer with a strong commitment to maritime safety, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our specialized Marine Angle Flange Pressure Relief Valve, engineered in strict compliance with the CBT3843-1999 standard. Since our establishment in 2016, we have dedicated ourselves to producing high-reliability fluid control solutions for the global shipping industry. This valve is a critical safety component designed to protect expensive marine piping systems and equipment from dangerous overpressure conditions, ensuring operational integrity and crew safety. Our extensive export experience across continents, including North America, Southeast Asia, and Europe, underscores the international trust in our quality and adherence to rigorous standards.
This valve is engineered for durability and precise performance in the challenging marine environment. Its angle flange design allows for easy installation in tight spaces and complex piping layouts commonly found on vessels. The core mechanism is calibrated to open at a predetermined set pressure, automatically discharging excess medium to prevent system failure, and to reseal tightly once normal pressure is restored.
Key Technical Features & Specifications:
- Standard Compliance: Manufactured to meet all requirements of the China Shipbuilding Standard CBT3843-1999, ensuring suitability for marine applications.
- Robust Construction: Typically constructed from high-grade cast steel or corrosion-resistant stainless steel options to withstand saltwater, humidity, and variable temperatures.
- Reliable Sealing: Features precision-machined seats and discs (often with resilient seals) to ensure bubble-tight shut-off and prevent leakage.
- Accurate Calibration: The spring mechanism is carefully calibrated and tested to ensure the valve opens consistently at the specified relief pressure.
- Versatile Application: Suitable for protecting systems handling seawater, lubricating oil, fuel oil, compressed air, and low-pressure steam on various vessel types.
- Maintenance-Friendly Design: Many models allow for in-line testing and maintenance without requiring complete removal from the pipeline.
The following table outlines typical configurable parameters. Exact specifications are determined based on your system's design pressure, temperature, and medium.
| Parameter | Typical Range / Options |
| Nominal Diameter (DN) | DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100 (Others available) |
| Pressure Rating (PN) | PN10, PN16, PN25, PN40 (Custom set pressure within range) |
| Body Material | Cast Steel (WCB), Stainless Steel (CF8/304, CF8M/316), Ductile Iron |
| Seat/Disc Material | Stainless Steel, with optional hardened surfaces or resilient seals (EPDM, NBR, Viton) |
| Flange Standard | GB, ANSI, JIS, DIN standards available upon request |
| Operating Temperature | Standard: -20°C to 200°C. High-temp designs available. |
Advantages & Client Benefits:
- Enhanced System Safety: Provides reliable overpressure protection, preventing costly damage to pumps, heat exchangers, tanks, and pipelines.
- Regulatory Compliance: Using a CBT3843-1999 compliant valve helps shipyards and operators meet classification society and maritime safety regulations.
- Reduced Downtime & Maintenance: Durable construction and reliable operation minimize unscheduled maintenance and replacement costs.
- Flexible Sourcing: With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we offer flexible and efficient logistics to global clients.
- Customization Support: We work with clients to tailor valve specifications (size, pressure, material, flange standard) to fit specific system drawings and requirements.
Backed by our ISO9001 certified quality management system, every Marine Angle Flange Pressure Relief Valve undergoes stringent factory testing, including shell tests and set pressure verification, before shipment. Our annual export value of US$1-1.5 Million to diverse markets from North America to Oceania is a testament to the consistent performance and reliability our products deliver to shipbuilders, repair yards, and fleet operators worldwide. Choosing our valve means investing in a safety-critical component built for longevity and peace of mind. Contact us today with your specifications for a detailed quotation and technical support.
Frequently Asked Questions (FAQ):
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Q: What is the CBT3843-1999 standard, and why is compliance important?
A: CBT3843-1999 is a Chinese national standard specifically for marine pressure relief valves. Compliance ensures the valve's design, materials, manufacturing, and testing meet the rigorous demands of marine service, which is often required for vessel classification and approval. -
Q: Can you provide valves with flanges matching ANSI or JIS standards?
A: Yes. While we default to GB standards for the domestic market, we regularly produce valves with ANSI, JIS, DIN, or other international flange face dimensions and drilling patterns upon request. Please specify your required standard. -
Q: How is the set pressure determined and tested?
A: The set pressure is specified by the client based on the system's maximum allowable working pressure (MAWP). We calibrate the spring accordingly. Each valve is factory-tested (typically with air or water) to verify it opens within an acceptable tolerance of the set pressure. -
Q: What materials are recommended for saltwater service?
A: For superior corrosion resistance in seawater applications, we recommend stainless steel bodies (CF8M/316 or equivalent) and internal components. Specific material grades can be discussed based on the exact service conditions. -
Q: Is the valve suitable for viscous fluids like heavy fuel oil?
A: Yes, but it requires special consideration. We can advise on design modifications, such as bellows seals to prevent gumming or special trim, to ensure reliable operation with viscous media. -
Q: Do you offer certifications or test reports with the valves?
A: Yes. We can provide a manufacturer's data report, material certificates, and factory test reports (shell test, set pressure test) for each valve or batch, which are commonly needed for marine project documentation. -
Q: What is your typical lead time for custom orders?
A: Lead time depends on order quantity, material availability, and customization level. Generally, it ranges from 4 to 8 weeks for standard configurations. We provide a confirmed schedule upon order placement. -
Q: How does the "angle flange" design benefit installation?
A: The angle (90-degree) design allows the inlet and outlet flanges to be on perpendicular planes. This saves space and simplifies piping layout, often allowing the valve to be mounted directly to a tank nozzle or fitting, reducing the number of pipe elbows needed.
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