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Help CenterManual Override Marine Quick Closing Valve Cast Steel DN40 PN25 Flanged
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Shanghai Zhibang Valve Manufacture Co., Ltd., established in 2016, is a professional manufacturer dedicated to producing high-quality industrial valves. Our Manual Override Marine Quick Closing Valve Cast Steel DN40 PN25 Flanged is designed to meet the rigorous demands of marine and offshore applications, offering reliable emergency shut-off capability with the flexibility of manual override control. This valve combines robust cast steel construction with precision engineering, ensuring long service life even in harsh environments.
The valve features a flanged connection conforming to standard dimensions, making it easy to install in existing piping systems. With a nominal diameter of DN40 and pressure rating of PN25, it is suitable for a wide range of medium-pressure fluid control systems. The manual override mechanism allows operators to quickly close the valve in emergency situations, while also providing the ability to operate it manually for routine maintenance or testing.
Our manufacturing process adheres to strict quality control standards, and we hold ISO9001 certification to ensure consistent product excellence. Each valve undergoes rigorous testing before shipment, including pressure tests and functional checks. This valve is an ideal choice for shipbuilding, oil rigs, and other marine installations where safety and reliability are paramount.
Key Features & Benefits
- Manual Override Function: Enables immediate valve closure in emergencies, even if power or automatic controls fail.
- Cast Steel Body: High-strength material resistant to corrosion, impact, and high temperatures, ideal for marine environments.
- Flanged Connection: Standardized flange dimensions (EN, ANSI, or JIS options available upon request) for easy installation and maintenance.
- Quick Closing Design: Rapid shut-off mechanism reduces risk of leaks or spills during critical situations.
- DN40 & PN25 Rating: Suitable for medium-flow applications with nominal pressure up to 25 bar.
- Compact Structure: Space-saving design for tight installation spaces on ships or platforms.
- Low Maintenance: Simple construction with fewer moving parts reduces service requirements.
- Customizable Options: Available in different flange standards, trim materials, and sealing materials to meet specific customer needs.
Technical Specifications
| Parameter | Value |
| Body Material | Cast Steel (WCB, WCC or equivalent) |
| Nominal Diameter | DN40 (1.5 inch) |
| Pressure Rating | PN25 (25 bar / 360 psi) |
| Connection Type | Flanged (EN 1092-1, ASME B16.5, or JIS B2220 available) |
| Operation | Manual override lever / handwheel |
| Working Temperature | -20°C to +200°C (customizable for higher/lower) |
| Applicable Media | Water, oil, gas, and other non-corrosive fluids |
| Sealing Material | PTFE, NBR, or VITON (optional) |
| Compliance | ISO9001, designed to meet marine standards |
Product Advantages
The manual override feature is a critical safety enhancement. In marine applications, quick closing valves are often automatically actuated by fire detection or emergency shutdown systems. However, if the automatic system fails, the manual override allows crew members to physically close the valve, preventing catastrophic fuel or fluid leaks. The cast steel body provides excellent durability against saltwater corrosion, and the flanged connection simplifies installation and replacement.
Compared to conventional gate or globe valves, our quick closing valve responds much faster, reducing potential damage during emergencies. The valve's compact design saves valuable space on ships and offshore platforms. Additionally, the valve can be customized with different flange standards (ANSI, JIS, EN) to match existing piping systems, making it a versatile solution for global shipyards.
All valves are manufactured in our Shanghai facility with advanced CNC machining and robotic welding. We conduct 100% hydrostatic testing and shell pressure tests to ensure zero leakage at rated pressure. Our team also offers technical support for installation and maintenance, helping customers maximize valve lifecycle.
Why Choose Shanghai Zhibang Valve?
Since our founding in 2016, we have grown into a reliable valve supplier with annual export value exceeding US$1 million. Our products are exported to major markets across North America, South America, Europe, Southeast Asia, Africa, and Oceania. We ship from Shanghai, Guangzhou, Hong Kong, and Beijing ports, ensuring flexible logistics to meet your delivery schedule.
We take pride in our ISO9001 quality management system, which governs every step from raw material procurement to final inspection. Our experienced engineers and sales team work closely with clients to provide tailored solutions. Whether you need a standard DN40 PN25 flanged valve or a custom variant, we can deliver within competitive lead times.
By choosing Shanghai Zhibang Valve, you are investing in durable, high-performance valve solutions backed by a dedicated manufacturer. Contact us today to discuss your requirements or request a quotation. We are ready to support your marine projects with reliable valves that meet international standards.
Frequently Asked Questions (FAQ)
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Q: What is the difference between a manual override quick closing valve and a standard gate valve?
A: A quick closing valve is designed to close rapidly (usually within a few seconds) in emergency situations, while a gate valve operates slowly to control flow. The manual override feature allows human operation even if the automatic actuator fails. -
Q: Can this valve be used for high-pressure applications beyond PN25?
A: The standard model is rated PN25. For higher pressures, we can customize the valve with thicker body walls and stronger materials upon request. Please contact our sales team with your specific requirements. -
Q: Is the valve suitable for seawater service?
A: The cast steel body is corrosion-resistant, but for prolonged seawater exposure, we recommend optional epoxy coating or stainless steel trim. We can advise on the best material selection for your application. -
Q: What flange standards are available?
A: We offer flanges in EN 1092-1, ASME B16.5 (Class 150/300), and JIS B2220 (10K/20K). If you need a different standard, please specify the dimensions and we can produce accordingly. -
Q: How long is the delivery time for this valve?
A: Standard models typically ship within 15-25 working days after order confirmation. Customized orders may take 30-45 days depending on specifications. We can expedite for urgent projects. -
Q: Do you provide certificates of material or pressure test reports?
A: Yes, we can supply material certificates (EN 10204 3.1) and hydrostatic test reports upon request. Our ISO9001 quality system ensures traceability of all production batches. -
Q: What is the warranty period?
A: We offer a one-year warranty against manufacturing defects from the date of shipment. Extended warranties are available for bulk orders. -
Q: Can I get a sample before mass production?
A: Yes, samples are available. We can produce a single prototype for your testing and approval. The sample cost is negotiable and will be refunded for bulk orders.
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