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As a dedicated manufacturer of industrial valves since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing reliable fluid control solutions for demanding global markets. Our Marine Cast Iron Angle Safety Valve with Flange Connection, designed to meet the stringent CB304-1977 standard, is engineered for critical pressure protection in marine and offshore applications. This valve represents our commitment to manufacturing robust safety components that ensure operational integrity and personnel safety in harsh environments. With an annual export value reflecting consistent international trust, we supply durable valves that stand up to the challenges of seawater, variable pressures, and rigorous maritime service cycles.
This angle-type safety valve is a crucial component for pressure relief in piping systems where space constraints or flow direction necessitate a 90-degree outlet. Its cast iron construction provides excellent corrosion resistance and mechanical strength, making it suitable for a wide range of marine services, including bilge systems, ballast systems, cooling water lines, and auxiliary machinery. The flanged connection ensures a secure, leak-proof interface with standard piping, facilitating easier installation and maintenance compared to threaded alternatives. The design prioritizes reliable automatic operation; when system pressure exceeds the pre-set limit, the valve opens swiftly to discharge excess medium, preventing equipment damage and potential hazards.
Key Technical Features & Specifications:
- Robust Construction: Manufactured from high-grade cast iron, the valve body offers superior resistance to corrosion, erosion, and mechanical stress commonly encountered in marine environments.
- Precise Pressure Relief: Features a precision-calibrated spring mechanism that ensures consistent and accurate opening at the designated set pressure, with tight re-sealing upon pressure normalization.
- Flanged Design Advantage: The flange connection conforms to common international standards, providing a bolted, gasketed joint that is robust, easy to assemble/disassemble, and ideal for higher-pressure applications.
- Angle Pattern Efficiency: The 90-degree angle body design allows for direct installation at pipe elbows, saving space, reducing piping complexity, and minimizing pressure drop compared to inline valves with separate elbows.
- CB304-1977 Compliance: Designed and manufactured in strict accordance with the Chinese Ship Standard CB304-1977, ensuring it meets specific requirements for materials, design, pressure testing, and performance for shipboard use.
- Versatile Application Readiness: Suitable for use with water, oil, air, and other non-aggressive media in temperatures and pressures typical of marine auxiliary systems.
Detailed Parameters (Typical):
| Parameter | Specification / Option |
|---|---|
| Body Material | Cast Iron (Grade HT200/250) |
| Disc & Seat Material | Stainless Steel / Bronze (Optional) |
| Connection Standard | Flange to ANSI, JIS, DIN, or GB standards |
| Nominal Diameter (DN) | From DN15 to DN200 (custom sizes available) |
| Pressure Setting Range | Adjustable, typically 0.1 MPa to 2.5 MPa |
| Applicable Medium | Water, Sea Water, Oil, Air, Steam |
| Operating Temperature | Up to 200°C (dependent on seal material) |
| Testing Standard | Shell Test & Seat Leakage Test per CB304-1977 |
Benefits for Your Operations:
- Enhanced System Safety: Provides a fail-safe mechanism to automatically prevent overpressure situations, protecting expensive pumps, heat exchangers, tanks, and pipelines from catastrophic failure.
- Reduced Maintenance & Downtime: The durable cast iron body and reliable spring mechanism minimize wear and the frequency of maintenance interventions, leading to higher system availability.
- Simplified Installation & Inventory: The flanged angle design reduces the number of fittings and elbows required in a piping layout, simplifying installation and lowering overall project material costs.
- Global Compliance Facilitation: Adherence to the recognized CB304-1977 standard aids in meeting classification society and regulatory requirements for vessel construction and repair, streamlining approval processes.
- Cost-Effective Reliability: Offers a balance of performance and economy, delivering the essential safety function required for marine applications without unnecessary premium costs.
Backed by our ISO9001 certified quality management system, every Marine Cast Iron Angle Safety Valve undergoes rigorous production checks and final testing to guarantee performance aligns with specification. Our products reach diverse global markets from major ports like Shanghai, Guangzhou, and Hong Kong, demonstrating proven logistics capability. Choosing Shanghai Zhibang means partnering with a manufacturer that understands the critical nature of marine safety components. We encourage you to contact us with your specific pressure, size, and flange standard requirements. Our team is ready to provide detailed technical support and a competitive quotation to equip your vessels with dependable, standards-compliant safety valves.
Frequently Asked Questions (FAQ):
Q1: What is the main advantage of an "angle" type safety valve over a conventional "straight-through" design?
A1: The primary advantage is space savings and piping simplification. An angle valve can be installed directly where a pipeline changes direction (at an elbow), eliminating the need for a separate elbow fitting and a longer run of pipe to accommodate an inline valve. This often results in a more compact and efficient system layout.
Q2: Can this valve be used with media other than water, such as fuel oil or compressed air?
A2: Yes, it is suitable for a range of non-aggressive fluids and gases, including fuel oil, lubricating oil, and compressed air. The specific material compatibility, especially for seals, should be confirmed based on the exact media properties (e.g., viscosity, chemical composition).
Q3: How is the pressure setting adjusted on this valve?
A3: The opening pressure is typically adjusted by compressing or relaxing the internal spring via an adjustment mechanism (like a screw or nut) located on the top of the valve. This should be performed by qualified personnel using calibrated equipment to ensure accuracy and safety.
Q4: Is the CB304-1977 standard recognized internationally for marine applications?
A4: While CB standards are Chinese national standards for shipbuilding, they are widely recognized and accepted, especially in markets across Asia and by many international shipyards and owners. They are often considered equivalent to other major national standards for marine equipment.
Q5: What flange standards are available for this valve?
A5> We can manufacture valves with flanges to match various common standards, including ANSI (ASME), JIS, DIN, and GB. It is crucial to specify your required flange standard, pressure class (e.g., PN16, Class 150), and facing type when inquiring or ordering.
Q6: Do you provide documentation like test certificates with the valve?
A6> Yes, as a standard practice, we provide a manufacturer's data report and a factory test certificate for each valve or batch. The test certificate typically documents the shell test pressure and seat leakage test results performed in accordance with the relevant standard.
Q7: What is the typical lead time for an order of these valves?
A7> Lead time depends on the order quantity, specific size, and pressure setting requirements. For standard configurations, production can often be completed within a few weeks. We provide estimated lead times upon receipt of your detailed inquiry.
Q8: Can the valve be repaired or have parts replaced in the field?
A8> Yes, the design generally allows for in-situ maintenance. Critical wearing parts like the spring, disc, and seat are often replaceable. Having a stock of common spare parts can facilitate quick repairs and minimize vessel downtime.
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