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Help CenterMarine System Cast Iron Angle Safety Valve Flange Type CB304-1977
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As a leading manufacturer with ISO9001 certified quality management, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our Marine System Cast Iron Angle Safety Valve, designed and built to the stringent CB304-1977 standard. Engineered for reliability in demanding maritime environments, this valve is a critical component for safeguarding your vessel's pressure systems. With years of expertise and a commitment to precision, we deliver a product that combines robust construction with dependable performance, ensuring operational safety and compliance for shipbuilders and marine engineers worldwide. Our focus on durable materials and exacting standards makes this valve a trusted choice for global marine applications.
This flange-type angle safety valve is specifically constructed for marine and offshore systems where space constraints and reliable pressure relief are paramount. Its angled body design allows for efficient piping layout, often saving valuable space in engine rooms and pump compartments. The valve operates automatically, opening at a pre-set pressure to prevent overpressure scenarios that could damage equipment or pose safety risks. Once system pressure returns to a safe level, the valve reseals tightly, minimizing product loss and maintaining system integrity.
- Heavy-Duty Cast Iron Construction: The valve body is manufactured from high-grade cast iron, selected for its excellent strength, durability, and cost-effectiveness in marine environments. It provides a solid foundation for long-term service.
- CB304-1977 Compliance: Manufactured in strict accordance with the CB304-1977 standard, ensuring it meets the specific design, material, and testing requirements for marine valves, providing assurance of quality and suitability.
- Flange Connection for Secure Mounting: The flange-type ends facilitate a strong, leak-resistant connection to piping systems, which is crucial for maintaining system pressure and safety on moving vessels subject to vibration.
- 90-Degree Angle Design: The angle pattern allows for a change in flow direction within the valve body itself, which can simplify piping arrangements, reduce the number of fittings needed, and create a more compact installation.
- Reliable Spring-Loaded Mechanism: At the heart of the valve is a precision-calibrated spring mechanism. This ensures consistent and accurate opening at the designated set pressure, providing dependable overpressure protection.
- Corrosion Resistance Features: While the main body is cast iron, critical internal components like the seat and disc are often available in more corrosion-resistant materials (e.g., stainless steel) upon request, enhancing longevity in saltwater atmospheres.
- Easy Testing and Maintenance: The design typically allows for in-line testing capabilities to verify the set pressure without removing the valve from the line, supporting essential maintenance schedules and regulatory checks.
The technical specifications of the valve are designed to offer flexibility and reliability. Below is a summary of typical parameters; specific dimensions and pressure ratings can be customized based on your project requirements.
| Parameter | Typical Specification / Option |
| Body Material | Cast Iron |
| Design Standard | CB304-1977 |
| Connection Standard | Flange (e.g., ANSI, JIS, DIN available) |
| Nominal Pressure (PN) | PN10, PN16, PN25 (Customizable) |
| Nominal Diameter (DN) | DN15 to DN200 range |
| Set Pressure Range | Adjustable within a specified range |
| Seat & Disc Material | Stainless Steel, Bronze (Optional) |
| Operating Medium | Water, Steam, Oil, Air (Non-hazardous) |
| Operating Temperature | Suitable for standard marine system temperatures |
Choosing this valve provides several tangible benefits for your operation. Enhanced System Safety is the primary advantage, as it acts as a fail-safe against dangerous pressure build-ups. The space-saving angle design contributes to more efficient engine room layouts, potentially reducing overall installation costs. Compliance with the CB304-1977 marine standard simplifies the approval process for new builds or retrofits, giving you and your clients confidence in regulatory adherence. Furthermore, the robust cast iron construction ensures a long service life with minimal maintenance, leading to lower total cost of ownership over the valve's lifespan.
Frequently Asked Questions (FAQ)
Q1: What does the "CB304-1977" standard refer to?
A1: CB304-1977 is a Chinese industry standard specifically for marine valves. It outlines requirements for design, materials, manufacturing, testing, and inspection to ensure valves are suitable for the rigorous conditions encountered in marine service.
Q2: Is cast iron suitable for marine environments? Won't it rust quickly?
A2: High-quality cast iron, when properly specified and optionally with surface treatments, offers good corrosion resistance for many marine applications, particularly for components like valve bodies. For critical sealing surfaces, we recommend or provide options for stainless steel seats and discs to prevent rust-related leakage.
Q3: Can the set pressure of the valve be adjusted on-site?
A3: The set pressure is typically calibrated and sealed at the factory to ensure accuracy and compliance. Some models may allow for limited field adjustment by authorized personnel, but it is generally recommended to specify the required set pressure at the time of order for optimal performance and safety certification.
Q4: What flange standards are available?
A4: We can manufacture valves with flanges to match various international standards, including ANSI (ASME), JIS, DIN, and GB standards. Please specify your required flange standard, pressure class, and facing when inquiring.
Q5: What media is this valve designed for?
A5: This angle safety valve is suitable for a range of non-hazardous fluids common in marine systems, such as seawater, freshwater, lubricating oil, compressed air, and low-pressure steam. For specific corrosive or specialized media, please consult with our engineering team for material recommendations.
Q6: Do you provide testing certificates with the valve?
A6: Yes, as an ISO9001 certified manufacturer, we conduct routine tests (such as shell test and seat test) during production. Upon request, we can provide a standard factory test certificate. More detailed certification, such as a formal type approval certificate for marine use, can be discussed based on your project requirements.
Q7: What is the typical lead time for an order?
A7: Lead time depends on the order quantity, specifications, and customization required. For standard specifications from our catalog, we can often arrange shipment promptly. We will provide a clear production and delivery schedule upon receipt of your formal inquiry or order.
Q8: How do I determine the correct size (DN) and set pressure for my application?
A8: The valve size and set pressure are determined by your system's design parameters, including flow rate, pipe size, and the maximum allowable working pressure (MAWP) of the protected equipment. It is crucial to consult your system design drawings or work with a marine engineer to specify these correctly. Our technical team is also available to assist based on the information you provide.
Backed by our established manufacturing expertise since 2016 and an ISO9001 quality system, Shanghai Zhibang Valve delivers products that meet rigorous standards. Our annual export value reflects the trust placed in us by clients across North America, South America, Europe, Asia, Africa, and Oceania. We support this global reach with efficient logistics from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing. This valve embodies our commitment to providing reliable, specification-compliant marine components. For your next marine project requiring dependable pressure safety, contact us to discuss your specifications or to request a detailed quotation. Let our expertise help secure your systems.
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