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Help CenterCB304-1977 Marine Cast Iron Angle Safety Valve With Flange and Mill Test Report
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As a dedicated manufacturer with a strong export footprint across global markets, Shanghai Zhibang Valve is proud to present our CB304-1977 Marine Cast Iron Angle Safety Valve. Engineered for reliability in demanding marine and industrial environments, this valve combines robust construction with precise safety functionality. We understand the critical need for dependable pressure protection in piping systems, which is why our valve is designed to meet specific marine standards and comes with comprehensive documentation, including a Mill Test Report, to ensure quality and traceability from our factory floor to your installation site. Our commitment to ISO9001 certified manufacturing processes guarantees consistent performance and durability, making this valve a trusted component for system integrators and shipbuilders worldwide.
The CB304-1977 valve is specifically designed as an angle-pattern safety valve, offering distinct advantages in piping layout and installation. Its cast iron body provides excellent strength and corrosion resistance suitable for various fluids, including seawater, air, and oil in marine applications. The angle design allows for a 90-degree change in flow direction directly at the valve, saving space and reducing the need for additional pipe elbows. This design not only simplifies the piping system but also minimizes pressure drop and potential leak points. The flanged connections ensure a secure, bolt-on installation that is compatible with standard piping systems, facilitating easier maintenance and inspection. Each valve is subjected to rigorous factory testing to verify its set pressure and reseating performance, ensuring it activates precisely when needed to protect valuable equipment from overpressure damage.
Key technical specifications and features of our Marine Cast Iron Angle Safety Valve include:
- Robust Construction: The main body and bonnet are manufactured from high-grade marine cast iron, known for its durability and resistance to deformation under pressure.
- Precise Safety Mechanism: Features a spring-loaded disc mechanism that opens at a pre-set pressure and closes tightly once system pressure normalizes, preventing product loss and maintaining system integrity.
- Standard Compliance: Designed and manufactured in accordance with the CB304-1977 standard, which outlines requirements for marine valves, ensuring suitability for maritime use.
- Enhanced Sealing: The valve seat and disc are precision-machined to provide a bubble-tight seal. Optional materials like stainless steel for the trim are available for enhanced corrosion resistance or specific media compatibility.
- Installation Flexibility: The flanged ends conform to common standards such as ANSI, DIN, or JIS, providing broad compatibility with existing flanged piping systems.
For engineers and procurement specialists, the detailed parameters are crucial for system design. Below is a summary of typical specifications:
| Parameter | Specification / Option |
|---|---|
| Body Material | Cast Iron (Marine Grade) |
| Design Standard | CB304-1977 |
| Connection Type | Flanged (RF Face typical) |
| Pressure Class | PN10, PN16, PN25 (or equivalent ANSI Class) |
| Size Range (Nominal) | DN15 (1/2") to DN200 (8") commonly available |
| Seat/Disc Material | Standard: Cast Iron / Optional: Bronze, Stainless Steel |
| Spring Housing | Enclosed, weather-protected design |
| Lever for Manual Testing | Optional, for periodic function check |
The primary benefit of choosing this valve is the integration of safety, durability, and convenience. The angle pattern offers significant space savings in engine rooms and tight machinery spaces common on vessels. The inclusion of a Mill Test Report with each valve provides verifiable evidence of material chemistry and mechanical properties, which is often a mandatory requirement for marine classification society approvals and for quality assurance in industrial projects. This documentation saves you time and effort during the inspection and certification processes. Furthermore, our valve's design focuses on maintainability; key components can be accessed for inspection or replacement without removing the entire valve from the line, reducing downtime and maintenance costs over the valve's long service life.
Backed by our company's experience since 2016 and an annual export volume reflecting trust from markets in North America, Europe, Asia, and beyond, Shanghai Zhibang Valve stands as a reliable partner. Our ISO9001 certification is a testament to our systematic approach to quality control in every stage of production. We ship efficiently from major Chinese ports like Shanghai and Guangzhou, ensuring timely delivery to your project. This CB304-1977 Marine Cast Iron Angle Safety Valve is more than just a component; it's a commitment to safeguarding your systems. We invite you to contact us for specific pressure settings, flange standards, or any customization needs to make this valve the perfect fit for your application.
Frequently Asked Questions (FAQ)
Q1: What is the main application of this CB304-1977 valve?
A1: This valve is primarily designed for marine service, including shipboard piping systems for bilge, ballast, cooling water, fuel oil, and compressed air lines where overpressure protection is required. It is also suitable for similar industrial applications.
Q2: What does the "Mill Test Report" include, and why is it important?
A2: The Mill Test Report (MTR) is a certificate from the material manufacturer that provides the chemical composition and mechanical properties (like tensile strength) of the cast iron used for the valve body. It is crucial for quality verification, traceability, and is often required for approval by marine classification societies and for compliance with project specifications.
Q3: Can this valve be used for steam service?
A3: Standard cast iron safety valves are generally not recommended for steam service due to temperature limitations and potential for brittle fracture. For steam applications, valves in materials like cast steel are typically specified. Please consult with our engineers for high-temperature media.
Q4: Are the flanges drilled according to a specific standard?
A4: Yes, the flanges can be manufactured to match common international standards such as ANSI B16.5, DIN, or JIS. The specific standard and pressure class (e.g., PN16, ANSI 150) should be specified at the time of inquiry or order to ensure compatibility with your piping.
Q5: How is the set pressure of the valve determined and adjusted?
A5: The set pressure is determined by the spring inside the valve. Valves are factory-set and tested to a specific pressure as requested by the customer. Field adjustment is possible by trained personnel by compressing or relaxing the spring within a calibrated range, though it is recommended to have critical settings verified with test equipment.
Q6: What is the advantage of an "angle" pattern safety valve over a "globe" pattern?
A6: An angle pattern valve allows the inlet and outlet to be at a 90-degree angle. This eliminates the need for an extra pipe elbow in the line where a direction change is required, resulting in a more compact installation, reduced weight, lower pressure drop, and fewer potential leak points in the system.
Q7: Do you offer different trim materials for the seat and disc?
A7: Yes. While the standard trim is cast iron, we offer options such as bronze or stainless steel for improved corrosion resistance, better sealing performance, or compatibility with specific aggressive media. This can be customized upon request.
Q8: What is your typical lead time for an order of these valves?
A8: Lead time depends on the order quantity, specific specifications (size, pressure setting, flange standard), and current production schedule. Standard configurations may have shorter lead times. Please contact our sales team with your detailed requirements for an accurate delivery estimate.
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