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Help CenterGB/T3036-94 QT450 Ductile Iron Semi Lug Hydraulic Butterfly Valve Offshore Platform Fitting
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Shanghai Zhibang Valve Manufacture Co., Ltd. presents our premium GB/T3036-94 QT450 Ductile Iron Semi Lug Hydraulic Butterfly Valve, specifically engineered for demanding offshore platform applications. With over 8 years of manufacturing excellence since 2016 and ISO9001 certification, we deliver valves that combine superior corrosion resistance, reliable hydraulic control, and rugged construction. This butterfly valve is designed to meet the rigorous requirements of marine environments, offering exceptional sealing performance and long service life.
Our semi-lug type hydraulic butterfly valve features a ductile iron body (QT450) that provides high strength and impact resistance, making it ideal for high-pressure fluid control systems on offshore platforms. The valve complies with the Chinese national standard GB/T3036-94, ensuring compatibility and interchangeability with existing systems. Whether used for seawater, oil, or gas applications, this valve delivers reliable shut-off and flow regulation.
Key features include a hydraulic actuator for precise remote operation, a resilient seat for zero-leakage performance, and a semi-lug design that allows easy installation between flanges without the need for a full set of bolts. This design reduces installation time and maintenance costs, especially in confined spaces typical of offshore platforms.
Technical Specifications
| Parameter | Details |
|---|---|
| Standard | GB/T3036-94 |
| Body Material | QT450 Ductile Iron |
| Disc Material | Ductile Iron or Stainless Steel (optional) |
| Seat Material | EPDM / NBR / PTFE (optional) |
| Size Range | DN50 – DN600 (2" – 24") |
| Pressure Rating | PN10 / PN16 / Class 150 |
| Operation | Hydraulic Actuator (single or double acting) |
| End Connection | Lug type (semi-lug, ISO 5211 mounting) |
| Temperature Range | -20°C to +120°C (depending on seat material) |
Product Features & Benefits
- Durable Ductile Iron Construction: QT450 material offers high tensile strength and excellent corrosion resistance, ideal for offshore saltwater environments.
- Semi-Lug Design: Reduces weight and bolt requirements, simplifying installation and maintenance—especially valuable in tight offshore platform spaces.
- Hydraulic Actuator: Provides smooth, reliable remote control with emergency manual override option. Suitable for automated systems.
- Zero-Leakage Performance: Resilient seat design ensures bubble-tight shut-off even under low pressure, meeting stringent environmental standards.
- Compliance with GB/T3036-94: Conforms to Chinese national standard for butterfly valves, ensuring quality and interchangeability.
- Customizable Options: Available in various disc and seat materials, actuator types, and coatings to match specific fluid and operating conditions.
- Low Maintenance: Simple design with fewer moving parts reduces downtime and maintenance costs over the valve's lifetime.
Quality Assurance & Trust
As a manufacturer with ISO9001 certification and an annual export value of US$1 million to US$1.5 million, Shanghai Zhibang Valve ensures every valve undergoes rigorous testing before shipment. Our production facility in Shanghai, China, equipped with advanced machining and testing equipment, allows us to deliver consistent quality. We have supplied valves to markets across North America, South America, Europe, Asia, Africa, and Oceania, earning trust from clients in the offshore, marine, and industrial sectors.
Our valves are available for shipment from Shanghai, Guangzhou, Hong Kong, and Beijing ports, with flexible logistics to meet your project deadlines. We offer comprehensive technical support, including installation guidance, actuator sizing, and after-sales service. Choose Shanghai Zhibang Valve for reliable, cost-effective flow control solutions that perform in the harshest offshore environments.
Frequently Asked Questions
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Q: What is the difference between a semi-lug and full-lug butterfly valve?
A: A semi-lug valve has lugs on only one side of the body, allowing it to be installed between flanges with fewer bolts. This makes it lighter and easier to install in confined spaces, but it is not suitable for dead-end service. Full-lug valves have lugs on both sides and can be used for end-of-line applications. -
Q: Can this valve be used for seawater applications?
A: Yes, with proper material selection. The QT450 ductile iron body is suitable, but we recommend adding a protective coating (e.g., epoxy) and using a stainless steel disc or a resilient seat made of EPDM or PTFE for enhanced corrosion resistance in seawater. -
Q: What is the maximum operating pressure for this valve?
A: The standard pressure ratings are PN10 and PN16 (Class 150). For higher pressure requirements, please contact our engineering team for custom solutions. -
Q: Does the hydraulic actuator come with a manual override?
A: Yes, our hydraulic actuators typically include a manual handwheel or lever for emergency operation. This is standard for most configurations. -
Q: What certifications does this valve have?
A: The valve is designed and manufactured under ISO9001 quality management system. It complies with GB/T3036-94 standard. Additional certifications such as WRAS, FM, or UL can be provided upon request for specific projects. -
Q: What is the lead time for an order?
A: Lead time depends on size and quantity. Standard sizes (DN50-DN300) typically ship within 15-30 days after order confirmation. Larger sizes may require 30-45 days. -
Q: Can you provide custom actuator voltage or control signals?
A: Absolutely. We offer hydraulic actuators with various control options, including on/off, modulating, and fail-safe functions. Please specify your requirements when ordering. -
Q: How do I choose the correct seat material for my application?
A: EPDM is suitable for water and seawater, NBR for oil and fuel, PTFE for high-temperature or aggressive chemicals. Contact our technical team for assistance based on your fluid composition and temperature.
Contact Shanghai Zhibang Valve today to discuss your offshore platform valve needs. We offer competitive pricing, fast delivery, and reliable technical support.
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