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Help CenterZhibang Valve Marine Slow Closing Butterfly Check Valve DN50-DN600, PN10-PN40 Cast Steel Body
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As a dedicated manufacturer of industrial valves since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our specialized range of Marine Slow Closing Butterfly Check Valves. Engineered for critical marine and demanding industrial applications, this valve combines the reliable sealing of a butterfly valve with the essential safety function of a non-slam check valve. We understand the need for dependable, maintenance-friendly components in shipboard systems, offshore platforms, and coastal infrastructure. Our commitment to the ISO 9001 quality management system ensures every valve, from DN50 to DN600, is built to perform under the rigorous conditions of global maritime operations, from the shipyards of Eastern Asia to the ports of North America and Europe.
This valve is designed to prevent reverse flow in piping systems while mitigating the damaging effects of water hammer, a common issue in pump discharge and other fluid systems. Unlike standard check valves that can slam shut, our slow-closing mechanism ensures a controlled, gradual closure, protecting your entire piping network from shock pressures. The robust cast steel body provides excellent corrosion resistance and structural integrity, suitable for PN10 to PN40 pressure classes.
Key Features and Technical Advantages:
- Integrated Slow-Closing Mechanism: The valve features an integrated hydraulic damper or spring mechanism that regulates the disc's closing speed. This is crucial for preventing water hammer, which can cause pipe bursts, joint failures, and pump damage.
- Robust Cast Steel Construction: The body and major components are crafted from high-quality cast steel (e.g., WCB, LCB), offering superior strength and durability for marine environments, including exposure to sea water atmospheres.
- Bidirectional Sealing (Optional): Depending on your system requirements, valves can be configured for bidirectional flow blocking, adding an extra layer of safety and system isolation capability.
- Low Pressure Drop & Compact Design: The butterfly disc design ensures minimal flow resistance when fully open, promoting system efficiency. Its compact, flanged design saves space and weight compared to traditional swing check valves, a significant advantage in marine engineering.
- Easy Maintenance & Inspection: Many models feature a top-entry design, allowing for internal inspection, seat replacement, and maintenance without removing the valve body from the pipeline, drastically reducing downtime and service costs.
- Versatile Seat & Liner Options: To handle various media—from sea water and ballast water to oils and chemicals—the valve seat can be lined with EPDM, NBR, Viton, or other elastomers suitable for specific temperature and chemical compatibility needs.
Technical Specifications at a Glance:
| Parameter | Specification / Range |
| Valve Type | Slow Closing Butterfly Check Valve |
| Size Range (Nominal Diameter) | DN50, DN65, DN80, DN100, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600 |
| Pressure Rating (PN) | PN10, PN16, PN25, PN40 |
| Body Material | Cast Steel (A216 WCB, LCC, etc.) |
| Disc Material | Cast Steel / Stainless Steel (e.g., CF8, CF8M) |
| Seat / Liner Material | EPDM, NBR, Viton, PTFE (Customizable) |
| Connection Standard | Flanged per ISO, ANSI, JIS, DIN, GB standards |
| Operating Temperature | Dependent on seat material (e.g., -20°C to +120°C for EPDM) |
| Applicable Media | Water, Sea Water, Oil, Air, Mild Chemicals |
Why Choose Zhibang's Marine Slow Closing Check Valve? The direct benefit to your operation is enhanced system longevity and reduced maintenance costs. By eliminating water hammer, you protect expensive pumps, meters, and piping. The valve's automatic operation requires no external power, making it a fail-safe component. Its reliability is critical for ballast systems, cooling water lines, firefighting systems, and engine room services on vessels and offshore installations.
With an annual export value reflecting our global reach, Shanghai Zhibang Valve has established trust across continents, supplying to markets in North America, South America, Europe, Southeast Asia, Africa, and Oceania. Our valves are shipped from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring logistical efficiency. Our ISO 9001 certification is your assurance of consistent quality and a systematic approach to manufacturing. We are not just a supplier; we are a partner in ensuring the safety and efficiency of your fluid control systems. Contact us today to discuss your specific DN and PN requirements, and let our engineering expertise provide you with a reliable, high-performance solution that stands the test of time and the harsh marine environment.
Frequently Asked Questions (FAQ)
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Q: What is the main purpose of the "slow closing" feature?
A: The primary purpose is to prevent water hammer. When flow stops or reverses, the valve disc closes in a controlled manner over several seconds, rather than slamming shut instantly. This gradual closure prevents a sudden pressure surge (shock wave) that can damage pipes, fittings, and equipment. -
Q: Can this valve be used for applications other than marine?
A: Absolutely. While designed for marine durability, it is equally suitable for any industrial application where reverse flow prevention and water hammer mitigation are needed, such as in pump discharge lines for water treatment plants, HVAC systems, irrigation, and power generation facilities. -
Q: How do I select the correct pressure rating (PN) for my system?
A: The PN rating must be equal to or greater than the maximum working pressure in your system, including any possible pressure surges. For example, if your system operates at 12 bar, a PN16 valve would be appropriate. Our team can assist you in selecting the correct rating based on your operating parameters. -
Q: What are the available flange standards?
A> We can manufacture valves with flanges conforming to major international standards, including ISO (European), ANSI (American), JIS (Japanese), DIN (German), and GB (Chinese). Please specify your required standard when inquiring. -
Q: Is the valve maintenance-free?
A> While designed for long service life with minimal maintenance, periodic inspection is recommended. The top-entry design allows for easy access to internal parts like the seat and disc for inspection or replacement without removing the entire valve body from the line, simplifying maintenance procedures. -
Q: What is the lead time for an order of DN400, PN25 valves?
A> Lead times vary based on order quantity, specific material configurations, and current production schedule. For standard configurations in cast steel with common seat materials, typical production time is available upon request. We recommend contacting our sales team with your detailed requirements for an accurate timeline. -
Q: Do you offer custom coatings or special materials for highly corrosive media?
A> Yes, customization is available. Beyond standard cast steel, we can offer bodies in duplex stainless steel, special coatings like epoxy or rubber lining, and a wider range of seat elastomers to handle specific corrosive chemicals or abrasive slurries. Discuss your media details with our engineers. -
Q: How is the slow-closing mechanism activated? Does it require external power?
A> No external power is required. The mechanism is typically internal and self-actuated. It uses a combination of springs and hydraulic damping (or a dashpot) that is activated by the reversal of flow itself, making it a completely automatic and fail-safe device.
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