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Help CenterMarine Butterfly Check Valve With Counterweight, PN10-PN40, Standard Compliant for Ship Piping
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As a leading manufacturer with a commitment to precision engineering, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our Marine Butterfly Check Valve with Counterweight. Designed specifically for the demanding environments of marine and shipboard piping systems, this valve combines robust construction with intelligent design to ensure reliable, maintenance-free flow control. Our years of experience since 2014, backed by ISO9001-certified production processes, are embodied in this product, offering shipbuilders and marine engineers a dependable solution for preventing backflow and protecting critical equipment.
The core value of this valve lies in its simplicity and effectiveness. The integrated counterweight mechanism ensures automatic, rapid closure upon flow reversal without requiring external power sources or complex control systems. This makes it an ideal, fail-safe component for various applications onboard vessels, from ballast and bilge systems to cooling water lines and fuel transfer pipelines.
Key Features & Technical Advantages:
- Optimized Counterweight Design: The precisely calibrated counterweight ensures swift and positive closure, minimizing water hammer and preventing reverse flow effectively.
- Wide Pressure Range: Available in pressure ratings from PN10 to PN40, providing flexibility for low to medium-pressure shipboard applications.
- Durable Material Selection: Body and disc are crafted from high-grade materials like cast iron, ductile iron, or stainless steel (AISI 304/316) to withstand corrosive seawater and marine atmospheres.
- Versatile Sealing Options: Seat rings are available in EPDM, NBR, or PTFE, offering compatibility with a wide range of media including seawater, freshwater, fuels, and lubricants.
- Compact & Lightweight Wafer/Lug Design: Saves space and reduces weight compared to traditional swing check valves, a critical factor in marine design.
- Low Flow Resistance: The butterfly disc design creates minimal pressure drop when open, contributing to energy efficiency in pumping systems.
- Maintenance-Free Operation: Simple design with few moving parts translates to long service life with minimal upkeep required.
- Standard Compliant: Manufactured under a strict ISO9001 quality management system, ensuring consistent performance and reliability.
Detailed Technical Specifications:
| Parameter | Specification |
| Valve Type | Butterfly Check Valve with Counterweight |
| Pressure Rating (PN) | PN10, PN16, PN25, PN40 |
| Size Range (DN) | DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600 |
| Connection Standards | Wafer (between flanges), Lug (threaded inserts) |
| Body Material | Cast Iron, Ductile Iron, Stainless Steel (Optional) |
| Disc Material | Cast Iron coated/Stainless Steel |
| Seat Material | EPDM (Standard), NBR, PTFE (Available upon request) |
| Operating Temperature | -10°C to +120°C (Depends on seat material) |
| Applicable Media | Seawater, Freshwater, Oils, Fuels, Air, Mild Chemicals |
Benefits for Your Marine Projects:
- Enhanced System Protection: Prevents backflow, protecting pumps, compressors, and other upstream equipment from damage.
- Operational Reliability: The passive counterweight mechanism ensures functionality even during power loss or control system failure.
- Reduced Lifecycle Cost: Low maintenance requirements and durable construction lead to lower total cost of ownership.
- Design Flexibility: Available in a wide size and pressure range to fit various piping layouts and system requirements onboard.
- Global Supply Confidence: Supported by our established export framework serving markets across North America, South America, Europe, Asia, Africa, and Oceania.
Shanghai Zhibang Valve's reputation is built on a foundation of quality and global reach. With an annual export value consistently between US$1 Million and US$1.5 Million, we have proven our ability to meet the stringent demands of international marine projects. Our valves are shipped from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics to your location. Choosing our Marine Butterfly Check Valve means partnering with an ISO9001-certified manufacturer dedicated to providing reliable, standard-compliant components for the global shipping industry. Contact us today to discuss your specific requirements and experience the Zhibang difference in marine valve solutions.
Frequently Asked Questions (FAQ):
Q1: How does the counterweight mechanism work in this butterfly check valve?
A: The counterweight is attached to the valve disc shaft. Under forward flow, the disc is pushed open. When flow stops or reverses, gravity acts on the counterweight, providing the torque to automatically and swiftly rotate the disc back to the closed position, sealing the valve.
Q2: What are the main advantages of a butterfly check valve over a traditional swing check valve for marine use?
A: Butterfly check valves are typically more compact, lighter, and have a lower profile, saving crucial space and weight on ships. They also often have a lower pressure drop and can close more quickly, reducing water hammer potential.
Q3: Can this valve be used with seawater?
A: Yes, when specified with appropriate materials such as stainless steel (AISI 316) body/disc and EPDM or PTFE seats, this valve is well-suited for seawater service. Please specify the media during inquiry.
Q4: What is the difference between wafer and lug type connections, and which should I choose?
A: Wafer valves are installed between two pipeline flanges with long bolts. Lug valves have threaded inserts (lugs) allowing them to be bolted directly to a flange at each end, which can be beneficial for end-of-line service or easier installation/removal. Our team can advise based on your piping layout.
Q5: What pressure rating (PN) do I need for my application?
A: The required PN depends on your system's maximum working pressure. Common marine applications like ballast or cooling water often use PN16 or PN25. We offer a range from PN10 to PN40 to accommodate various needs.
Q6: Are these valves suitable for vertical pipe installation?
A: The counterweight mechanism is designed for horizontal flow. For vertical installation, the orientation of the shaft and counterweight is critical. Please consult our engineering team for specific vertical installation requirements.
Q7: Do you provide customizations for specific project requirements?
A: Yes, as a manufacturer, we can discuss customizations such as special materials, coatings, dimensions, or testing procedures. Contact us with your specifications.
Q8: What is your typical lead time and packaging for export?
A: Lead time depends on quantity and specifications. Standard valves are typically available sooner. For export, valves are securely packed in wooden cases to prevent damage during sea freight, complying with international shipping standards.
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