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Laico D371X Rubber Lined Lug & Wafer Type Soft Sealing Butterfly Valve with Worm Gear - Manufacturer of Firefighting, Water Supply & Drainage, HVAC, and Industrial Valves
Product Introduction
Likv Valve's D371X Series Rubber Lined Pinless Lug/Wafer Butterfly Valve with Worm Gear is a high-performance pipeline control valve that combines a pinless sealing structure with the advantages of worm gear transmission. It is specifically designed for water supply and drainage, municipal engineering, fire protection & HVAC, sewage treatment, and industrial circulating water systems.
Adopting an integral pinless disc structure, it fundamentally solves the common issues of traditional pinned butterfly valves, such as pinhole leakage and pin breakage/detachment. Paired with a high-quality EPDM rubber-lined valve seat, it achieves zero leakage with soft sealing. The worm gear handwheel drive makes opening and closing large-diameter valves effortless and labor-saving. The valve body supports both wafer and lug installation, offering bi-directional sealing, wear resistance, and anti-aging properties. It is suitable for various water, air, and weak acid/alkali media under normal temperature and pressure, making it a mainstream general-purpose valve for industrial pipelines and construction projects.
Core Product Advantages
1. Pinless Sealing Structure: Zero Leakage & Higher Durability
The valve stem and disc adopt an integrally forged pinless connection. With no pinholes and no loosening, it thoroughly eliminates the risks of pin corrosion, wear, and breakage found in traditional butterfly valves. The sealing performance far exceeds that of conventional butterfly valves, and the service life is increased by more than 3 times.
The valve stem and disc adopt an integrally forged pinless connection. With no pinholes and no loosening, it thoroughly eliminates the risks of pin corrosion, wear, and breakage found in traditional butterfly valves. The sealing performance far exceeds that of conventional butterfly valves, and the service life is increased by more than 3 times.
2. Worm Gear Drive: Easy Operation for Large Diameters
The high-precision copper worm gear mechanism features a self-locking function, allowing a single person to easily open and close valves up to DN600. It comes with a clear opening indicator for precise flow regulation and prevents accidental opening or closing.
The high-precision copper worm gear mechanism features a self-locking function, allowing a single person to easily open and close valves up to DN600. It comes with a clear opening indicator for precise flow regulation and prevents accidental opening or closing.
3. High-Quality Rubber-Lined Seat: Bi-Directional Sealing & Anti-Aging
The valve seat is integrally vulcanized using EPDM rubber, offering excellent elasticity, wear resistance, and anti-aging properties, suitable for working conditions from -20℃ to 120℃. It supports bi-directional sealing, meaning the media flow direction is unrestricted, and there are no directional constraints during installation.
The valve seat is integrally vulcanized using EPDM rubber, offering excellent elasticity, wear resistance, and anti-aging properties, suitable for working conditions from -20℃ to 120℃. It supports bi-directional sealing, meaning the media flow direction is unrestricted, and there are no directional constraints during installation.
4. Dual-Purpose Valve Body Design: Strong Installation Adaptability
The valve body features a dual-purpose wafer and lug structure. It can be installed directly as a wafer type or bolted via lugs, adapting to various installation scenarios such as flanges, pipelines, and equipment. Its compact structure and lightweight design save installation space.
The valve body features a dual-purpose wafer and lug structure. It can be installed directly as a wafer type or bolted via lugs, adapting to various installation scenarios such as flanges, pipelines, and equipment. Its compact structure and lightweight design save installation space.
5. Excellent Materials: Engineering-Grade Quality
The valve body is made of Ductile Iron QT450-10, offering high strength and good toughness. The disc is available in ductile iron with nickel-phosphorus plating, 304 stainless steel, or 316 stainless steel. The valve stem is made of 2Cr13 stainless steel, providing corrosion and rust resistance, suitable for general conditions in municipal, fire protection, and chemical industries.
The valve body is made of Ductile Iron QT450-10, offering high strength and good toughness. The disc is available in ductile iron with nickel-phosphorus plating, 304 stainless steel, or 316 stainless steel. The valve stem is made of 2Cr13 stainless steel, providing corrosion and rust resistance, suitable for general conditions in municipal, fire protection, and chemical industries.
Applicable Scenarios
- Municipal Engineering: Waterworks, sewage treatment plants, urban water supply and drainage networks.
- Building & HVAC: Fire protection systems in high-rise buildings, central air conditioning circulating water, heating pipelines.
- Industrial Fields: Chemical circulating water, cooling water systems, light industry/mining pipelines.
- Environmental Protection Industry: Waste gas/wastewater treatment, desulfurization and denitrification supporting pipelines.
- Others: General fluid pipelines in ships, power stations, metallurgy, and food processing.
Detailed Technical Parameters
| Parameter Item | Technical Specifications |
|---|---|
| Product Model | D371X-10Q, D371X-16Q |
| Nominal Diameter | DN50-DN600 (Full specifications in stock) |
| Nominal Pressure | PN1.0MPa, PN1.6MPa |
| Connection Type | Wafer / Lug Dual-Purpose |
| Structure | Centerline Soft Sealing, Pinless Connection |
| Drive Mode | Worm Gear Handwheel (Manual) |
| Body Material | QT450-10 Ductile Iron (Cast Steel/SS Customizable) |
| Disc Material | Ductile Iron (Ni-P Plated), 304 SS, 316 SS |
| Stem Material | 2Cr13 Stainless Steel, 304 Stainless Steel |
| Seat Material | EPDM (NBR Optional) |
| Sealing Grade | GB/T 13927 Class A (Zero Visible Leakage) |
| Applicable Temp. | EPDM: -20℃~+120℃; NBR: -20℃~+80℃ |
| Applicable Media | Water, Air, Weak Acid/Alkali, Circulating Water, Oil, etc. |
| Switching Angle | 0°~90° |
| Execution Standard | GB/T12238, ISO5752, API609 |
Installation and Maintenance
Installation Points
- Clean pipeline debris before installation and check that the valve sealing surface is undamaged.
- For wafer installation, ensure flanges on both sides are parallel and tighten bolts evenly and symmetrically; for lug installation, simply fix with bolts.
- The valve can be installed at any angle, with the handwheel oriented for easy operation.
- After installation, conduct a water pressure test at 1.5 times the nominal pressure to verify sealing performance.
Maintenance
- Regularly inspect the worm gear head and add grease to keep opening/closing flexible.
- Avoid long-term half-open usage to reduce wear on the rubber-lined seat.
- If the valve seat is damaged, it can be replaced online directly without dismantling the pipeline.
- For long-term idle valves, keep them slightly open to protect the sealing surface.
About Likv Valve
Likv Valve (Tianjin) Co., Ltd. is an integrated enterprise focusing on the R&D, production, and sales of industrial valves. Equipped with CNC machining production lines and precision testing equipment, we strictly implement the ISO9001 quality management system, and our products have passed fire protection certification and CE certification.
Our main products include butterfly valves, gate valves, ball valves, check valves, and other general-purpose valves, suitable for all industries including water supply & drainage, fire protection, chemical, municipal, and electric power. Pinless butterfly valves, rubber-lined butterfly valves, and fluorine-lined butterfly valves are our core best-sellers. Standard specifications are available for immediate delivery. We support engineering customization and non-standard processing, with nationwide multi-warehouse shipping, and undertake large-volume engineering orders.
After-Sales Service
- Warranty Service: 1-year factory warranty; free repair or replacement for non-human damage.
- Delivery Time: Standard specifications in stock shipped within 24 hours; customized models delivered in 7-15 days.
- Technical Support: Free selection, installation guidance, and working condition adaptation solutions.
- Logistics & After-Sales: Nationwide logistics delivery, replacement for damaged goods, and 24-hour online customer service.