The Lug Wafer Dual-Disc Swing Check Valve <br>
The Lug Wafer Dual-Disc Swing Check Valve is a high-performance fluid control component meticulously designed to meet the diverse needs of modern industrial fluid systems. It stands out for its exceptional adaptability and reliability, ensuring seamless integration into various pipeline setups while delivering long-lasting, stable operation. Whether in high-pressure industrial pipelines or low-flow municipal water systems, this valve provides an efficient solution to prevent backflow, safeguarding equipment and optimizing system performance.
1. Specification Parameters
| Parameter Category | Specification Details |
| Valve Type | Lug Wafer Dual-Disc Swing Check Valve |
| Size Range | 1/2″ – 24″ (DN15 – DN600) |
| Pressure Rating | ANSI Class 150 – 300, PN10 – PN40 |
| Temperature Range | -20°C – 200°C (Standard); Customizable to -40°C – 300°C for special media |
| Body Material | Cast Iron, Ductile Iron, Carbon Steel (WCB), Stainless Steel (304, 316, 316L) |
| Disc Material | Stainless Steel (304, 316), PTFE-Coated Steel (for corrosion resistance) |
| Seat Material | NBR, EPDM, Viton, PTFE (meets different media compatibility needs) |
| End Connection | Lug Wafer (compliant with ANSI B16.5, DIN EN 1092-1 standards) |
| Flow Coefficient (Cv) | 5 – 1200 (varies by size and material) |
| Testing Standard | API 598, ISO 5208 (for pressure tightness and operation) |
2. Application Scenarios
The Lug Wafer Dual-Disc Swing Check Valve is strong adaptability makes it suitable for a wide range of industries and fluid media, solving backflow problems in various complex working conditions:
Water Treatment & Municipal Engineering: Ideal for water supply pipelines, sewage treatment systems, and irrigation networks. Its corrosion-resistant materials (such as 316 stainless steel) withstand the erosion of tap water, sewage, and chemical additives, ensuring stable water flow and preventing pipeline contamination from backflow.
Oil & Gas Industry: Applied in crude oil transportation, natural gas processing, and refinery pipelines. The high-pressure rating (up to ANSI Class 300) and wear-resistant disc design cope with the high viscosity and high-pressure characteristics of oil and gas, avoiding equipment damage caused by reverse fluid impact.
Chemical & Pharmaceutical Industry: Suitable for pipelines conveying acids, alkalis, solvents, and pharmaceutical intermediates. With seat materials like Vit
on
and PTFE (chemically inert), it ensures no media leakage or cross-contamination, meeting strict industry hygiene and safety standards.
Power Generation & Heating Systems: Used in thermal power plant cooling water pipelines and central heating networks. The wide temperature range (-20°C – 200°C) adapts to both low-temperature cooling water and high-temperature hot water, preventing pump cavitation and pipeline burst due to backflow.
3. Structural Features
The Lug Wafer Dual-Disc Swing Check Valve is structural design is optimized for practicality, ensuring it adapts to different installation environments and maintains long-term reliable operation:
Dual-Disc Swing Design: Compared with single-disc check valves, the dual-disc structure reduces flow resistance (lower pressure loss) and shortens the closing time. This not only improves the valve’s adaptability to low-flow and high-flow working conditions but also minimizes water hammer (a common cause of pipeline damage), enhancing system reliability.
Lug Wafer Connection: The lug-style design allows flexible installation—either between flanges (wafer type) or fixed with bolts (lug type) for easy disassembly and maintenance. It is compatible with most international flange standards (ANSI, DIN, JIS), eliminating the need for custom adapters and reducing installation costs for customers worldwide.
Robust Body & Sealing System: The body is made of high-strength materials (e.g., ductile iron, WCB carbon steel) with precision casting, ensuring resistance to high pressure and impact. The seat adopts an integrated sealing structure (no loose parts), and the disc is equipped with a soft seal (NBR/EPDM) to achieve zero leakage. Even after long-term use (up to 5 years of normal operation), the sealing performance remains stable, reducing maintenance frequency.
Universal Media Compatibility: By offering multiple material combinations (body, disc, seat), the valve can be customized according to the fluid type (water, oil, chemicals, etc.). For example, 316L stainless steel bodies are recommended for marine environments (saltwater corrosion), while PTFE seats are preferred for strong acid media—this customization ensures the valve adapts to almost any working condition.
4. Installation & Maintenance
To help users maximize the valve’s performance and service life, we provide simple, easy-to-follow installation and maintenance guidelines:
Installation Tips
Direction Confirmation: The valve has a clear flow direction mark (arrow on the body). Ensure the arrow aligns with the fluid flow direction—incorrect installation will cause backflow and valve damage.
Flange Alignment: When installing between flanges, clean the flange sealing surface (remove dirt, rust) and use a gasket that matches the media (e.g., PTFE gaskets for chemicals). Tighten the bolts evenly (in a diagonal sequence) to avoid uneven pressure on the valve body, which may lead to leakage.
Space Reservation: Reserve at least 2 times the valve diameter of space on both sides of the valve for future maintenance (e.g., 10 inches of space for a 5-inch valve). This humanized design avoids the need to disassemble the entire pipeline when replacing the valve.
Maintenance Guidelines
Regular Inspection: Check the valve’s external surface and flange connections quarterly for rust, leakage, or loose bolts. For outdoor or harsh environments (e.g., coastal areas), increase the inspection frequency to every 2 months.
Internal Cleaning: If the valve is used in media with impurities (e.g., sewage, slurry), disassemble the valve once a year to clean the disc and seat (use a soft brush, avoid hard tools that scratch the sealing surface).
Seal Replacement: When leakage occurs (detected by pressure testing or visual inspection), replace the seat seal promptly. The valve’s modular design allows replacing the seal without removing the entire valve—saving time and labor costs.
Storage Recommendation: For unused valves, store them in a dry, ventilated environment (avoid direct sunlight or rain). Wrap the valve ends with plastic caps to prevent dust and moisture from entering, ensuring it remains in good condition for future use.
Why Choose Our Lug Wafer Dual-Disc Swing Check Valve?
Strong Adaptability: Compatible with multiple standards, media, and working conditions—one valve solves backflow problems in different industries.
Reliable Performance: High-strength materials, optimized structure, and strict testing ensure long-term stable operation (average service life of 8 – 10 years).
Humanized Design: Easy installation, simple maintenance, and customizable options reduce your workload and costs.
We provide professional pre-sales consultation (helping you select the right material and size) and after-sales support (technical guidance for installation and maintenance). For any questions, please contact our team—we are committed to providing you with the best fluid control solutions.
5. Contact & Inquiry
For customized solutions, quotations, or samples, please contact us via:
- Online Chat (24/7 Support)
- Email: [email protected]
We offer tailor-made solutions for non-standard requirements (e.g., larger DN, special materials) to meet your specific industrial needs.