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Help CenterCast Iron Butterfly Valve DN50-DN300 NBR Seal for Shipboard Sewage Treatment
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As a professional manufacturer with a strong focus on industrial and marine valve solutions, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our robust Cast Iron Butterfly Valve series, specifically engineered for demanding shipboard sewage treatment applications. Engineered for reliability in corrosive marine environments, this valve series combines durable cast iron construction with high-performance NBR sealing to ensure leak-free operation and long service life in critical onboard wastewater systems. With an annual export value reflecting our global reach and commitment to quality, we provide valves that meet the rigorous demands of maritime operations worldwide.
Our Cast Iron Butterfly Valves are designed to handle the challenging conditions of shipboard sewage treatment, where resistance to corrosion, abrasion, and various chemicals is paramount. The valve's design prioritizes easy operation, maintenance, and integration into complex piping systems found on vessels.
- Durable Construction: The valve body is manufactured from high-grade cast iron, providing excellent mechanical strength and corrosion resistance, which is essential for the saline and chemically aggressive environment of marine sewage systems.
- Superior Sealing Performance: Equipped with an NBR (Nitrile Butadiene Rubber) seal, the valve offers excellent sealing integrity. NBR is known for its good resistance to oils, fuels, water, and a wide range of chemicals commonly found in sewage, ensuring a tight shut-off and preventing leakage.
- Versatile Size Range: Available in a comprehensive range from DN50 (2") to DN300 (12"), this series can accommodate various pipeline diameters within a ship's sewage treatment plant, from collection lines to discharge outlets.
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Multiple Operation Options: To suit different system requirements and levels of automation, the valves can be fitted with various actuators:
- Manual Lever: For simple, quick on/off operation in easily accessible locations.
- Worm Gear Operator: Provides mechanical advantage for easier operation of larger size valves under higher pressure.
- Electric Actuator: Enables remote control and integration into automated ship management systems.
- Pneumatic Actuator: Ideal for systems utilizing compressed air, offering fast and reliable actuation.
- Compact & Lightweight Design: Compared to gate valves of similar size, butterfly valves offer a more compact design, saving valuable space and reducing weight on board—a critical factor in shipbuilding.
- Bidirectional Flow Capability: The valve design allows for flow in either direction, simplifying installation and providing flexibility in piping layout.
- Easy Maintenance: The resilient seat design often allows for seat replacement without removing the valve body from the pipeline, minimizing downtime during maintenance.
Below is a summary of key technical specifications for standard configurations:
| Parameter | Specification |
| Body Material | Cast Iron |
| Disc Material | Cast Iron, Ductile Iron, or Coated (Optional) |
| Seat / Seal Material | NBR (Standard), EPDM, Viton (Optional) |
| Size Range (Nominal Diameter) | DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 |
| Pressure Rating (PN) | PN10, PN16 (Standard) |
| Temperature Range (with NBR) | -20°C to +80°C |
| Connection Type | Wafer (Standard), Lug (Optional) |
| Operation Type | Lever, Gear, Electric, Pneumatic (Selectable) |
| Face-to-Face Length | Conforms to ISO 5752, API 609, or other standards |
The primary advantage for ship operators and builders is the assurance of a reliable, low-maintenance component for a critical system. Sewage treatment failure can lead to environmental compliance issues and operational disruptions. Our valves help prevent such scenarios by offering consistent performance. The combination of cast iron and NBR provides a cost-effective solution without compromising on durability or sealing capability. Furthermore, the availability of multiple actuation methods allows for seamless integration into both new builds and retrofit projects, enhancing operational efficiency.
Backed by our ISO9001-certified manufacturing processes established in 2016, every valve undergoes stringent quality checks to ensure it meets performance standards. Our products are trusted by clients across diverse global markets, including North America, South America, Europe, Asia, Africa, and Oceania, demonstrating their universal suitability. With major ports of shipment like Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure efficient and reliable logistics for our international customers. Choosing our Cast Iron Butterfly Valve means investing in a component that contributes to the overall reliability, safety, and environmental compliance of your vessel's operations. Contact us today to discuss your specific requirements or to request a detailed quotation.
Frequently Asked Questions (FAQ):
Q1: Why is cast iron a suitable material for shipboard sewage valves?
A1: Cast iron offers an excellent balance of strength, castability, and corrosion resistance at a reasonable cost. It performs well in the wet, corrosive environments typical of marine applications, including exposure to saline water and various sewage chemicals.
Q2: What are the benefits of using an NBR seal in this application?
A2: Nitrile Butadiene Rubber (NBR) is highly resistant to a wide range of oils, fuels, greases, and water-based fluids commonly encountered in sewage. It provides a reliable, resilient seal that maintains integrity under typical operating temperatures and pressures for sewage systems.
Q3: Can this valve be used for applications other than sewage on a ship?
A3: Yes. While optimized for sewage treatment, this valve series is also suitable for other onboard seawater cooling lines, ballast water systems (with proper material selection), and general industrial water service where its pressure and temperature ratings are appropriate.
Q4: What is the difference between wafer and lug-style butterfly valves?
A4: Wafer-style valves are designed to be clamped between two pipeline flanges. Lug-style valves have threaded inserts (lugs) on the valve body, allowing them to be bolted directly to each flange, which can be beneficial for end-of-line service or easier maintenance.
Q5: Are electric or pneumatic actuators available from stock?
A5: We offer a range of actuator options. Standard manual valves (lever/gear) are typically available from stock. Electric and pneumatic actuators are often customized based on torque requirements, voltage, and signal specifications. Please inquire with your specific needs for lead time.
Q6: What standards do your valves comply with?
A6> Our manufacturing facility operates under an ISO9001 Quality Management System. The valves are generally designed and manufactured to meet international standards such as ISO, API, or other relevant norms for face-to-face dimensions, pressure ratings, and testing. Specific standard compliance can be confirmed upon request.
Q7: What is the lead time for an order of DN200 valves?
A7> Lead times vary based on order quantity, configuration (actuator type), and current production schedule. For standard DN200 valves with manual operation, we can often provide a competitive lead time. We recommend contacting our sales team with your detailed requirements for an accurate delivery estimate.
Q8: Do you provide documentation and certification with the valves?
A8> Yes. Standard shipments include essential documentation such as a packing list, commercial invoice, and a general quality certificate from our ISO9001 system. Specific test reports or material certificates are available upon request.
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