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Help CenterMarine Self Closing Valve DN20-DN80 PN25 Flanged End Spring Return Automatic Shutoff
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Shanghai Zhibang Valve Manufacture Co., Ltd is a professional manufacturer specializing in high-quality marine valves since 2016. Our Marine Self Closing Valve DN20-DN80 PN25 Flanged End Spring Return Automatic Shutoff is designed to provide reliable and safe shutoff in demanding marine environments. With a spring-return mechanism, this valve automatically closes when the operating pressure is released, ensuring safety in critical systems. Backed by ISO9001 certification and years of export experience, we deliver valves that meet the rigorous standards of the global maritime industry.
This valve is engineered for durability and precision, made from high-grade materials such as cast iron, ductile iron, or stainless steel (optional). It is suitable for use in shipboard fuel, ballast, cooling water, and fire-fighting systems, where automatic shutoff is essential to prevent leaks and accidents. The flanged end connection allows for easy installation and maintenance, while the spring-return feature ensures fail-safe operation. Below we detail the key features and technical specifications.
Key Features & Technical Specifications
- Automatic Spring Return: The valve closes automatically when the actuating force (manual or hydraulic) is removed, providing fail-safe shutoff in emergency situations.
- Pressure Rating PN25: Engineered to withstand working pressures up to 25 bar (approx. 362 psi), suitable for medium to high-pressure marine systems.
- Size Range DN20-DN80: Available in nominal diameters from 20mm to 80mm, covering a wide range of piping requirements.
- Flanged End Connection: Conforms to standard flanges (e.g., DIN, ANSI, JIS) for secure and leak-proof installation. Custom flanges available upon request.
- Durable Construction: Body materials include cast iron (GG25), ductile iron (GGG40), or stainless steel (CF8/CF8M) – optional to meet specific corrosion resistance needs.
- Compact Design: Optimized for space-saving installation in tight engine rooms and pipe compartments.
- Low Maintenance: The spring-return mechanism is simple and robust, minimizing wear and tear. All internal parts are replaceable.
- Certified Quality: Manufactured under ISO9001 quality management system, ensuring consistent performance and traceability.
| Parameter | Details |
| Nominal Diameter (DN) | 20, 25, 32, 40, 50, 65, 80 |
| Pressure Rating | PN25 (25 bar) |
| Connection Type | Flanged (RF, FF) |
| Body Material Options | Cast Iron / Ductile Iron / Stainless Steel |
| Seal Material | NBR, EPDM, or Viton (optional) |
| Operating Temperature | -20°C to +120°C (depending on seal) |
| Applicable Medium | Water, Oil, Air, Gas (non-aggressive) |
| End Face Standard | DIN EN 1092, ANSI B16.5, or JIS B2220 (customizable) |
Detailed Product Advantages
Safety First: The spring-return automatic shutoff function is critical for marine applications where accidental line rupture or power failure could cause flooding or fuel spills. Once the manual handle or hydraulic actuator is released, the valve instantly closes under spring force, preventing backflow and isolating the system.
Versatile Installation: The flanged end design allows direct mounting to standard pipe flanges, reducing installation time and cost. The valve can be installed in any orientation (horizontal, vertical, or inclined) without affecting its operation. Available flange drilling patterns can be customized to match your existing piping system.
Durable in Harsh Environment: Marine environments expose valves to saltwater, humidity, vibration, and temperature fluctuations. Our valves are coated with anti-corrosion primer and paint (optional epoxy coating) and are built with stainless steel internal springs to resist rust. The robust construction ensures long service life even in the most demanding conditions.
Easy Maintenance & Service: The valve body is designed with a bonnet that can be easily removed for inspection of the spring, disc, and seat. Replacement parts are available from our warehouse. We also provide technical support for installation and troubleshooting.
Compliance with Classification Societies: While we do not claim specific approvals without confirmation, our valves are manufactured to meet the general requirements of classification societies such as CCS, DNV, or ABS (subject to project-specific testing). Contact us for more details on certification support.
Trust & Company Strength
Shanghai Zhibang Valve Manufacture Co., Ltd has been a reliable valve manufacturer since 2016. With an annual export value of US$1 Million – US$1.5 Million, we supply valves to over 20 countries across North America, South America, Europe, Asia, Africa, and Oceania. Our production facility in Shanghai, China, is equipped with modern CNC machining centers, testing equipment, and a dedicated quality control team. We are ISO9001 certified, ensuring that every valve leaving our factory meets strict quality standards.
We ship from multiple ports: Shanghai, Guangzhou, Hong Kong, and Beijing, providing flexible logistics options. Our main markets include the domestic Chinese market as well as international clients in the marine, oil & gas, and industrial sectors. We are committed to offering competitive pricing, timely delivery, and after-sales support.
Why choose Zhibang? Because we combine professional engineering, factory-direct pricing, and a customer-centric approach. Our valves are designed to solve real-world problems in the marine industry. Whether you need a single valve or a bulk order, we are ready to assist. Contact us today for a quotation or technical consultation.
Frequently Asked Questions (FAQ)
Q1: What is the working principle of this marine self-closing valve?
A: The valve has a spring-loaded mechanism. When the valve is manually opened (or by an actuator), the spring is compressed. Once the operating force is released, the spring pushes the disc back to the closed position, automatically shutting off the flow. This provides fail-safe closure.
Q2: What materials are available for the valve body?
A: Standard options include cast iron, ductile iron, and stainless steel (304 or 316). Please specify your required medium and environment so we can recommend the best material.
Q3: Can the flange drilling be customized to match my existing flanges?
A: Yes, we offer customizable flange drilling patterns according to DIN, ANSI, JIS, or other standards. Please provide your flange specifications when ordering.
Q4: Is this valve suitable for seawater service?
A: For seawater, we recommend the stainless steel body option with a suitable seal material like EPDM. The valve can be coated with epoxy for additional corrosion protection. Please confirm the chemical compatibility with our sales team.
Q5: What is the temperature range of this valve?
A: The standard temperature range is -20°C to +120°C, depending on the seal material. For higher temperatures, we can provide special seals such as Viton or PTFE (consult for options).
Q6: Does the valve have any certification for marine use?
A: Our manufacturing facility is ISO9001 certified. While we do not automatically include third-party marine classification certificates, we can assist in arranging testing and documentation required by classification societies such as CCS, DNV, or ABS at an additional cost.
Q7: What is the typical lead time for an order?
A: For standard sizes (DN20-DN80) in common materials, lead time is usually 15-25 working days. For custom orders or special materials, please allow 25-40 working days. We will confirm the timeline upon order inquiry.
Q8: Can I get a sample for testing before bulk order?
A: Yes, sample orders are welcome. The sample cost will be charged, but we can refund it after the bulk order is placed. Please contact us to discuss sample availability and shipping.
For any further questions, please do not hesitate to contact our sales team. We are here to provide professional solutions for your marine valve requirements.
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