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Help CenterStandard-compliant Marine Butterfly Valve, Lug Type Design in DN400 and DN600
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As a professional valve manufacturer with extensive experience in serving the global marine industry, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance Standard-compliant Marine Butterfly Valve in Lug Type design. Engineered for demanding shipboard and offshore applications, this valve series, available in DN400 and DN600 sizes, is built to deliver reliable shut-off and flow control in critical piping systems such as seawater cooling, ballast, fire-fighting, and bilge lines. Our commitment to precision manufacturing and adherence to international marine standards ensures that every valve provides long-lasting, maintenance-free service in corrosive saltwater environments, helping vessel operators and shipyards enhance system safety and operational efficiency.
Our lug type butterfly valves are specifically designed for easy installation and removal between flanges without the need for a continuous flange bolt pattern, making them ideal for end-of-line service or system isolation. The robust construction and carefully selected materials combat the harsh conditions typical of marine operations.
- Superior Corrosion Resistance: Critical wetted components, including the disc and stem, are manufactured from high-grade stainless steel (SS316 or equivalent), providing excellent resistance to pitting and crevice corrosion from seawater, chemicals, and atmospheric salt spray. The valve body options include corrosion-protected cast iron or ductile iron with epoxy coatings, tailored to specific service requirements.
- Robust Lug Type Design: The lugged body features threaded inserts (lugs) that allow the valve to be bolted directly between two pipe flanges. This design permits the disconnection of one side of the piping system for maintenance while the other side remains sealed, a crucial feature for many marine system layouts.
- Reliable Bubble-Tight Sealing: We utilize high-performance elastomer seats, such as EPDM for freshwater and general service or NBR for hydrocarbon-based fluids. For more abrasive media or higher temperatures, PTFE seats are available. The seat is precision-molded and bonded or locked into the body to ensure a durable, bubble-tight seal even after prolonged cycling.
- Low Torque Operation & Extended Service Life: The disc profile is aerodynamically optimized to minimize pressure drop and operating torque. Combined with a polished stem and high-quality bearings, this ensures smooth, easy operation whether using a manual lever, gearbox, or actuator. Reduced operating stress translates directly into longer seal and component life.
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Versatile Actuation Options: To meet diverse automation needs on modern vessels, the valve is designed to interface seamlessly with various actuators:
- Manual: Simple lever for quick operation or lockable lever for safety.
- Gear Operator: Provides mechanical advantage for easier operation of larger DN600 valves or higher differential pressures.
- Electric/Pneumatic Actuator: For remote control and integration into the ship's automation and control systems. Actuators can be supplied as a complete package.
- Compliance & Traceability: Manufactured under a stringent quality management system, these valves are produced to meet or exceed relevant marine and industrial standards. Full material certification and traceability documentation are available to support classification society approvals and customer audits.
The technical specifications for our standard DN400 and DN600 marine lug butterfly valves are summarized below. Custom configurations for other pressures, temperatures, or materials are available upon request.
| Parameter | Specification |
|---|---|
| Nominal Diameter (DN) | 400 mm, 600 mm |
| Pressure Rating (PN) | PN10, PN16 |
| Face-to-Face Dimension | Per ISO 5752 Series 14 / EN 558-1 |
| Flange Connection | ISO 7005-2 / EN 1092-2 (PN10/16), JIS, ANSI B16.5 (Optional) |
| Body Material (Standard) | Cast Iron (GG25) with Epoxy Coating, Ductile Iron (GGG40) |
| Disc Material (Standard) | Stainless Steel CF8M (AISI 316) |
| Stem Material | Stainless Steel 431 (AISI 431) or equivalent |
| Seat Material (Standard Options) | EPDM, NBR, PTFE |
| Operating Temperature Range | -20°C to +120°C (varies with seat material) |
| Test Standards | Shell Test: API 598 / EN 12266-1; Seat Test: API 598 |
Choosing our marine butterfly valves brings tangible benefits to ship owners, operators, and shipyards. The lug type design simplifies installation and maintenance, reducing downtime during system repairs or inspections. The corrosion-resistant construction minimizes lifecycle costs by extending service intervals and replacement cycles, even in aggressive seawater service. Furthermore, the reliable sealing performance ensures system integrity, preventing leaks in ballast or bilge systems that could lead to environmental concerns or operational inefficiencies. For shipbuilders, our valves offer a cost-effective and compliant solution that meets the specifications for a wide range of vessel types, from cargo ships to offshore support vessels.
Backed by our company's established presence since 2016 and a proven track record of exporting to key maritime regions including North America, Europe, Southeast Asia, and the Middle East, you can trust in our capability to deliver. Our annual export value reflects the consistent quality and reliability that global partners depend on. We ship efficiently from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring timely delivery to your project site or warehouse. Let our expertise in marine valve manufacturing be the solution to your flow control challenges. Contact us today for detailed quotations, technical data sheets, or to discuss your specific application requirements for DN400, DN600, or other valve sizes.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a lug type butterfly valve over a wafer type for marine use?
A: The primary advantage is installation flexibility. A lug type valve has threaded lugs (or inserts) on the body. It can be bolted between two flanges without nuts on the downstream side, allowing one side of the pipeline to be disconnected independently. This is highly useful for end-of-line services, isolation for maintenance, or in systems where the downstream piping may need to be removed. Wafer valves rely on the flange bolts squeezing through the valve, requiring both flanges to be present and aligned.
Q2: Are these valves suitable for seawater service?
A: Yes, they are specifically designed for marine environments. The standard configuration includes a stainless steel (AISI 316) disc and stem, which offer excellent resistance to chloride-induced corrosion from seawater. The body can be supplied with protective epoxy coatings to prevent external corrosion. For highly aggressive or chlorinated seawater, material upgrades for the body (e.g., bronze, super duplex stainless steel) can be discussed.
Q3: Can these valves be operated automatically?
A: Absolutely. The valves are designed with a standardized mounting pad (ISO 5211) to easily accommodate electric or pneumatic actuators. We can supply the valve as a complete package with an actuator, limit switches, and positioners, ready for integration into your ship's control system.
Q4: What pressure classes do you offer for the DN400 and DN600 sizes?
A: Our standard offering includes pressure ratings of PN10 (10 bar) and PN16 (16 bar). These cover the majority of marine piping system requirements for cooling, ballast, and general service lines. For higher pressure applications, other designs or classes may be available upon request.
Q5: Do you provide documentation for classification society approval?
A: We can provide standard material certificates (3.1 Mill Certificates per EN 10204), test reports (for shell and seat tests per API 598/EN 12266), and general arrangement drawings. For specific classification society stamps (like ABS, DNV, LR, BV, etc.), requirements should be specified at the time of inquiry so we can confirm feasibility and any associated lead times or costs.
Q6: What is the typical delivery lead time for these valves?
A: For standard configurations in DN400 and DN600, we typically maintain some stock or can produce within a reasonable lead time. Exact delivery times depend on the specific material combination, quantity, and any special requirements. Please contact us with your project timeline for an accurate delivery schedule.
Q7: What seat materials do you recommend for different marine fluids?
A: EPDM is an excellent general-purpose seat for seawater, fresh water, and mild chemicals up to moderate temperatures. NBR is suitable for oils and fuels. For higher temperature service, more abrasive media, or where exceptional chemical resistance is needed, PTFE (Teflon) seats are the preferred choice. Our team can help you select the optimal seat based on your specific fluid and operating conditions.
Q8: Are spare parts like seals or discs available for long-term maintenance?
A: Yes, as the manufacturer, we maintain a supply of critical spare parts for our valve models. We recommend keeping a set of seals (seat, O-rings) as part of the vessel's critical spares inventory to minimize downtime during planned maintenance.
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