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Help CenterCB/T3594-94 Marine Float Air Cap, Cast Iron/Bronze, DN50-DN200, Flanged, Anti-Corrosion, CCS DNV Approved
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Shanghai Zhibang Valve Manufacture Co., Ltd., established in 2016 with an annual export value of US$1–1.5 million, is proud to present the CB/T3594-94 Marine Float Air Cap — a robust and reliable solution for marine ventilation systems. Manufactured in cast iron or bronze, these flanged air caps are designed to withstand harsh marine environments while providing efficient air release and vacuum protection. With sizes ranging from DN50 to DN200 and approvals from CCS and DNV, this product meets the highest industry standards for safety and durability.
Our air caps are engineered to prevent overpressure and vacuum damage in shipboard tanks, pipelines, and bilge systems. The float mechanism automatically closes when the liquid level rises, preventing spillage and contamination. The flanged connection ensures easy installation and a secure seal, while the anti-corrosion coating (available upon request) extends service life even in saltwater conditions. Backed by our ISO9001-certified production facility in Shanghai, China, each unit undergoes rigorous testing before shipment.
Key Features & Technical Specifications
- Material Options: Cast iron for general marine use; bronze for superior corrosion resistance in aggressive environments.
- Size Range: DN50, DN65, DN80, DN100, DN125, DN150, DN200 (custom sizes available upon request).
- Connection: Flanged to PN10/PN16 standards, with bolt holes according to CB/T3594-94.
- Operating Pressure: Up to 0.6 MPa (6 bar) depending on size and material.
- Float Mechanism: Internal float with stainless steel pivot pin for smooth operation and long life.
- Anti-Corrosion Treatment: Optional epoxy coating or hot-dip galvanizing for extended durability.
- Certifications: CCS (China Classification Society) and DNV (Det Norske Veritas) approved — supporting international maritime compliance.
| Parameter | Specification |
|---|---|
| Standard | CB/T3594-94 |
| Material | Cast Iron (HT200) / Bronze (CuSn5Zn5Pb5) |
| Nominal Diameter | DN50 – DN200 |
| Flange Standard | CB/T 3594-94 (PN10/PN16) |
| Working Pressure | 0.1 – 0.6 MPa |
| Working Temperature | -20°C to +80°C (up to +120°C on request) |
| Float Material | Stainless steel or copper (depending on model) |
Advantages & Customer Benefits
Our Marine Float Air Cap offers significant advantages over traditional vent caps:
- Prevents Liquid Overflow: The float automatically seals when the liquid level rises, eliminating spillage and pollution risks.
- Reduces Maintenance: Non-clogging design with smooth internal passages minimizes blockages and cleaning intervals.
- Easy Installation: Flanged connections match standard marine pipework; no special tools required.
- Long Service Life: Corrosion-resistant materials and optional coatings ensure reliable performance for years.
- Global Compliance: CCS and DNV approvals facilitate acceptance in international shipping and offshore applications.
- Customizable Options: Available in different materials, sizes, and coatings to meet specific project requirements.
Whether used in fuel tanks, ballast systems, or bilge lines, the CB/T3594-94 air cap provides a cost-effective and safe solution. Our factory in Shanghai has been serving clients in North America, South America, Europe, Africa, Oceania, and Asia since 2016, consistently delivering on time and with high quality.
Trust & Credibility
As a manufacturer with ISO9001 certification, Shanghai Zhibang Valve ensures strict quality control at every stage — from raw material sourcing to final assembly and testing. We have exported over US$1 million worth of marine valves annually, and our products are used in hundreds of vessels and offshore platforms. Our air caps are tested for pressure tightness, float functionality, and dimensional accuracy per CB/T3594-94. We offer flexible shipping from Shanghai, Guangzhou, Hong Kong, and Beijing ports, with fast delivery to any global destination.
Contact us today for a quote or technical support. Our team is ready to help you select the right air cap for your vessel and ensure optimum performance and safety.
Frequently Asked Questions
- What is the difference between cast iron and bronze air caps? — Cast iron is more economical and suitable for general marine use, while bronze offers superior corrosion resistance in aggressive environments like chemical tanks or saltwater. Both are available under the same standard.
- Can I get a custom size between DN50 and DN200? — Yes, we can produce intermediate sizes (e.g., DN65, DN125) upon request. Please contact us with your specific requirements.
- Are these air caps suitable for high-pressure systems? — The standard design works up to 0.6 MPa. For higher pressures, we can customize the flange thickness and materials. Please consult our engineers.
- Do you provide certificates of material and pressure test? — Yes, we provide material certificates (MTC) and hydrostatic test reports upon request at no extra charge.
- What is the lead time for an order? — For standard sizes (DN50–DN200 in cast iron), lead time is typically 15–20 working days. Bronze or custom orders may take 25–30 days.
- How do I install the air cap? — Simply bolt the flanged air cap onto the tank's vent pipe using a gasket. Ensure the float is free to move vertically. No special tools are needed.
- Can the air cap be used in both horizontal and vertical positions? — It is designed for vertical installation (float vertical). For horizontal mounting, please advise so we can adapt the internal mechanism.
- What is the warranty period? — We offer a 12-month warranty from the date of shipment against manufacturing defects. Extended warranty is available upon request.
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