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Help CenterLow Torque Operation GB/T3036-94 Semi-Lug Butterfly Valve With PTFE Coated Disc
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As a leading valve manufacturer based in Shanghai with extensive experience since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our advanced Low Torque Operation GB/T3036-94 Semi-Lug Butterfly Valve with PTFE Coated Disc. Engineered for efficiency and reliability, this valve is designed to meet the demanding requirements of modern fluid control systems across diverse industries. Our commitment to quality, backed by ISO9001 certification, ensures that every valve delivers superior performance and long service life. With an annual export value reaching US$1.5 million, our products have gained trust in major markets worldwide, including North America, Southeast Asia, Europe, and beyond, shipped efficiently from key ports like Shanghai, Guangzhou, and Hong Kong.
This semi-lug butterfly valve is a standout solution for applications where ease of operation, tight sealing, and maintenance accessibility are paramount. The core innovation lies in its low torque operation, which significantly reduces the effort required to open and close the valve, leading to smoother actuation, less wear on components, and extended operational life for actuators. The PTFE (Polytetrafluoroethylene) coated disc is a critical feature, providing an exceptionally low-friction surface that enhances the low-torque characteristic and offers excellent resistance to corrosion, chemical attack, and adhesion of media, ensuring a reliable bubble-tight seal even after prolonged use.
The valve is constructed to comply with the GB/T3036-94 standard, a recognized Chinese national standard for butterfly valves, ensuring dimensional interchangeability, material integrity, and performance consistency. The semi-lug design offers a versatile installation advantage. It features threaded inserts on both sides of the valve body, allowing it to be installed into a pipeline using bolts without needing nuts on the opposite side, similar to a wafer valve. However, unlike a standard wafer valve, the semi-lug design provides the added benefit of allowing the downstream piping to be disconnected for service without the entire valve assembly falling out, offering greater convenience for system maintenance.
Key Technical Specifications and Advantages:
- Optimized Disc and Stem Design: The disc profile and stem alignment are precision-engineered to minimize flow turbulence and hydraulic resistance, contributing directly to the low operating torque. This design ensures a 90-degree rotation from fully open to fully closed with minimal effort.
- Superior Sealing Performance: The combination of the PTFE-coated disc and a resilient seat (typically EPDM or NBR) creates a dual-sealing mechanism. The PTFE provides a slick, non-stick surface, while the elastomeric seat ensures compression and flexibility for a bubble-tight shut-off, suitable for a wide range of pressures.
- Robust Construction: The valve body is typically made from high-grade ductile iron or cast iron, offering strength and durability. Critical components are designed to withstand the operational stresses of frequent cycling.
- Versatile Actuation Compatibility: The low torque requirement makes this valve perfectly suited for pairing with various actuators, including manual lever/handwheel, gear operators, and pneumatic/electric actuators. It reduces the size and cost of the required actuator, leading to more compact and economical automated systems.
- Reduced Maintenance & Total Cost of Ownership: The PTFE coating drastically reduces wear on the disc and seat, while the low torque operation minimizes stress on the stem and bearings. This translates into fewer maintenance intervals, lower spare part consumption, and reduced downtime, offering significant long-term savings.
Detailed Technical Parameters Table:
| Parameter | Specification |
|---|---|
| Design Standard | GB/T3036-94 |
| Nominal Pressure (PN) | PN10, PN16 |
| Connection Type | Semi-Lug (Threaded Inserts) |
| Body Material | Ductile Iron (GGG40) / Cast Iron (HT250) |
| Disc Material | Ductile Iron with PTFE Coating |
| Stem Material | Stainless Steel (2Cr13/304) |
| Seat Material | EPDM, NBR (Standard Options) |
| Temperature Range | -10°C to 120°C (depends on seat material) |
| Applicable Media | Water, Air, Gas, Oil, Neutral Chemical Fluids |
| Operation | Manual Lever, Gearbox, Pneumatic/ Electric Actuator |
Application Benefits for Your Business: Implementing this valve in your systems leads to tangible operational improvements. Plant managers will appreciate the reduced maintenance workload and increased system reliability. Project engineers can design more efficient systems with smaller, less expensive actuators. Procurement specialists benefit from a reliable product with a competitive price from a certified manufacturer, supported by a global supply chain from our Shanghai base to ports worldwide. It is an ideal choice for HVAC systems, water treatment plants, industrial process lines, irrigation, and shipbuilding.
Choosing Shanghai Zhibang means partnering with a dedicated manufacturer with a proven track record. Our ISO9001-certified quality management system governs every production step, from raw material inspection to final testing. With a strong export presence across six continents, including key regions like Eastern Europe, Oceania, and the Middle East, we understand international standards and project requirements. Our strategic location allows for flexible logistics via Shanghai, Guangzhou, Hong Kong, or Beijing ports. We invite you to experience the difference that our engineered low-torque, PTFE-coated semi-lug butterfly valve can make for your fluid control applications. Contact us today for detailed quotations, technical drawings, or to discuss custom requirements for your specific project needs.
Frequently Asked Questions (FAQ):
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Q: What exactly does "low torque operation" mean for this valve?
A: Low torque operation means the valve requires significantly less rotational force to open and close compared to standard butterfly valves. This is achieved through an optimized disc design and the PTFE coating, reducing friction. It allows for easier manual operation and enables the use of smaller, more cost-effective actuators. -
Q: How does the semi-lug design differ from a wafer or full-lug butterfly valve?
A: A wafer valve relies on pipeline flanges to hold it in place. A full-lug valve has threaded lugs for bolting on both sides, allowing it to be a pipeline endpoint. Our semi-lug design has threaded inserts (lugs) but is not designed as an endpoint. It offers the installation ease of a wafer valve but with the benefit that the downstream pipe can be removed without the valve falling out, simplifying maintenance. -
Q: What are the primary advantages of the PTFE coating on the disc?
A: The PTFE coating provides multiple benefits: it creates an ultra-smooth, low-friction surface that contributes to low torque; it offers excellent chemical resistance, protecting the disc from corrosion; and it has non-stick properties, preventing media buildup that could compromise the seal or operation. -
Q: Is this valve suitable for throttling or flow control applications?
A: While butterfly valves can be used for throttling, this model is primarily optimized for reliable on/off isolation. The PTFE-coated disc and resilient seat provide excellent shut-off. For precise flow control, specific disc profiles and actuator controls would be recommended, which can be discussed as a customization option. -
Q: What seat material options are available, and how do I choose?
A: Standard options include EPDM (for hot water, steam, and some chemicals) and NBR (for oils, fuels, and water). The choice depends on your specific media, temperature, and pressure. We can provide guidance based on your application details to ensure compatibility and longevity. -
Q: Can this valve be fitted with an actuator for automated operation?
A: Absolutely. The low torque characteristic makes it an excellent candidate for automation. It can be easily fitted with pneumatic (double-acting or spring-return), electric, or hydraulic actuators. We can supply the valve as a manual unit or as a complete actuated assembly tailored to your control requirements. -
Q: Does compliance with GB/T3036-94 affect compatibility with ANSI or DIN flanges?
A: The GB/T3036-94 standard defines dimensions like face-to-face length and flange drilling. While it is a Chinese standard, many dimensions are harmonized or very close to common international standards like DIN. It is crucial to provide your flange standard (e.g., ANSI 150#, DIN PN16) when ordering to ensure proper fit. Our technical team can verify compatibility for your specific pipeline. -
Q: What is your typical lead time and packaging for export orders?
A: Lead times vary based on order quantity and specifications. Standard models often have shorter lead times. For export, valves are typically packaged in wooden crates or plywood boxes for optimal protection during sea or land freight. We ship from major Chinese ports like Shanghai and Guangzhou to facilitate smooth global logistics to your destination.
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