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Help CenterDN50-DN600 GB/T3036-94 Semi-Lug Butterfly Valve for PN16 Pipeline Systems
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As a professional valve manufacturer established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing reliable and cost-effective flow control solutions for global industrial markets. Our DN50-DN600 GB/T3036-94 Semi-Lug Butterfly Valve is engineered for PN16 pipeline systems, offering a perfect balance of durability, performance, and ease of installation. Designed to meet the rigorous demands of various applications from water treatment to general industrial processes, this valve represents our commitment to quality and customer satisfaction, backed by our ISO9001 certified manufacturing processes and an annual export value reflecting our global reach.
This semi-lug butterfly valve is constructed for robust service. The semi-lug (or wafer-lug) design provides a secure mounting solution, allowing the valve to be installed between two flanges without needing long through-bolts, which simplifies installation and maintenance. It is an ideal choice for systems requiring periodic removal for inspection or cleaning.
- Versatile Pressure Handling: Rated for PN16 (16 bar), making it suitable for a wide range of medium-pressure applications in water, air, and other non-aggressive fluids.
- Broad Size Range: Available from DN50 (2") to DN600 (24"), catering to diverse pipeline requirements across different project scales.
- Durable Construction: Features a robust disc and stem assembly designed for long-term, leak-tight operation with minimal maintenance.
- Flexible Sealing: Multiple seat material options (EPDM, NBR, PTFE) allow customization for different fluid temperatures and chemical compatibilities.
- Multiple Actuation Options: Can be supplied with a manual lever, gear operator, electric actuator, or pneumatic actuator to suit automated or manual control needs.
The valve's design adheres to the Chinese national standard GB/T3036-94, ensuring dimensional interchangeability and reliable performance within specified parameters. Its compact and lightweight design compared to gate or globe valves saves space and reduces structural support costs.
| Parameter | Specification / Option |
| Design & Manufacturing Standard | GB/T3036-94 |
| Nominal Pressure | PN16 |
| Nominal Diameter Range | DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600 |
| Body Material | Ductile Iron (Standard), Cast Iron, Carbon Steel (Optional) |
| Disc Material | Stainless Steel CF8/CF8M (Standard), Ductile Iron with Epoxy Coating (Optional) |
| Stem Material | Stainless Steel |
| Seat Material | EPDM (Water, -20°C to 120°C), NBR (Oil, -20°C to 80°C), PTFE (Corrosive, -20°C to 150°C) |
| Connection Standard | Face-to-face per GB/T3036-94; Flange drilling can be customized. |
| Operation Temperature | Depends on seat material (see above) |
| Leakage Class | Zero leakage for soft seat is achievable. |
For business buyers, the advantages are clear. The semi-lug design reduces installation time and cost, as it does not require nuts on both sides of the flange. The compliance with GB/T3036-94 ensures reliability and interchangeability in systems designed to this standard. Furthermore, the wide range of material combinations provides flexibility to handle different media, from potable water to mild chemicals, maximizing the valve's application scope and lifecycle value.
Trust in Shanghai Zhibang Valve is built on a foundation of quality and global experience. Our ISO9001 certification underpins every stage of production, from material sourcing to final testing. With an annual export value between US$1 Million and US$1.5 Million, our products have gained acceptance across diverse markets including North America, South America, Europe, Southeast Asia, Africa, and Oceania. We ship efficiently from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring timely delivery to your project site. Choose our PN16 Semi-Lug Butterfly Valve for a dependable, standardized solution that simplifies your procurement and enhances your system's performance. Contact us today to discuss your specifications or request a quotation.
Frequently Asked Questions (FAQ)
Q1: What is the main difference between a semi-lug and a wafer butterfly valve?
A1: A wafer valve relies on the pipeline flanges and through-bolts to hold it in place and seal it. A semi-lug valve has threaded inserts (lugs) on one side, allowing it to be bolted directly to a flange on that side, while the other side is held by the opposing flange. This makes the semi-lug design more secure for end-of-line service or when one side needs to be disconnected.
Q2: Can this valve be used for throttling flow control?
A2: While butterfly valves can be used for throttling, they are primarily designed for on/off service. For precise throttling control, especially with larger sizes, a specific high-performance butterfly valve or a different valve type like a globe valve might be more suitable. The suitability depends on the required flow characteristics and pressure drop.
Q3: Is the GB/T3036-94 standard compatible with international flange standards like ANSI or DIN?
A3: The face-to-face dimensions and pressure rating (PN16) of GB/T3036-94 are generally compatible with similar classes in DIN/EN standards. For ANSI flanges (e.g., Class 150), the drilling pattern and dimensions may differ. It is crucial to verify flange compatibility with your existing pipeline flanges before ordering. Custom drilling is often available upon request.
Q4: What seat material do you recommend for potable water applications?
A4: For potable (drinking) water applications, EPDM (Ethylene Propylene Diene Monomer) rubber is the standard and recommended seat material. It is certified for contact with drinking water in many regions, offers good aging resistance, and performs well within the typical temperature range of water systems.
Q5: Do you offer actuators for automated operation?
A5: Yes. We can provide electric actuators or pneumatic actuators as optional accessories. These can be mounted onto the valve's standard drive shaft (ISO 5211 mounting pad is standard). Please specify your required torque, control signal (for electric), or air pressure (for pneumatic) when inquiring.
Q6: What is the typical lead time for an order of DN200 valves?
A6: Lead time depends on the order quantity, specific material configuration, and current production schedule. For standard configurations (e.g., ductile iron body, SS disc, EPDM seat), we often have some stock or can produce within a few weeks. We provide accurate lead time estimates with every quotation.
Q7: Can the valve handle steam?
A7: Standard soft-seated butterfly valves (with EPDM, NBR) are not recommended for steam service due to temperature limitations. For low-pressure steam applications, PTFE seats can be considered, but it is critical to consult with our engineers regarding specific temperature, pressure, and cycle life requirements. Metal-seated butterfly valves are typically used for high-temperature steam.
Q8: What kind of testing do your valves undergo before shipment?
A8: Every valve undergoes routine factory tests, which typically include a shell test (body strength) and a seat leak test (sealing performance) using water or air at specified test pressures according to relevant standards. Detailed test reports can be provided upon request.
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