Product Overview
The Micro Resistance Slow Closing Check Valve is a large-diameter, high-performance non-return valve designed to prevent reverse flow and mitigate water hammer in high-flow systems such as water supply networks, power plants, and industrial pipelines. Featuring a butterfly disc design and an external hydraulic cylinder, this valve ensures smooth, controlled closure to eliminate pressure surges and protect critical infrastructure.
Constructed from ductile iron, carbon steel, or stainless steel, this valve is built to handle large volumes of water, oil, or gas with minimal pressure drop. Its hydraulic slow-closing mechanism (adjustable from 5 to 60 seconds) provides precise control over closure speed, making it ideal for applications where water hammer prevention is critical.
Key Features
Butterfly Disc Design: Large-diameter disc (up to DN2000) ensures low resistance flow with a Cv value ≥ 10,000 (DN1000).Suitable for high-flow systems such as pumping stations and water treatment plants.
Hydraulic Slow-Closing Mechanism: External hydraulic cylinder controls disc closure speed (adjustable from 5 to 60 seconds).Eliminates water hammer by gradually reducing flow velocity before sealing.
Durable Construction: Body materials: Ductile iron (EN-GJS-400-18), Carbon steel (ASTM A216 WCB), or Stainless steel (ASTM A351 CF8M).Disc and seat materials: Stainless steel (316/304) with EPDM or NBR seals for long-term reliability.
Low Maintenance: Self-lubricating bearings and corrosion-resistant coatings extend service life.Easy access to hydraulic cylinder for inspection and maintenance.
Compliance: Meets AWWA C508, EN 1074, and ISO 5208 standards for water and wastewater applications.
Operational Advantages
Water Hammer Prevention: Hydraulic slow-closing mechanism eliminates pressure surges.
Energy Efficiency: Low resistance flow reduces pump energy consumption.
Durability: Robust construction and corrosion-resistant coatings ensure long service life.
Ease of Maintenance: External hydraulic cylinder allows for quick inspection and adjustment.
Comparison with Standard Check Valves
| Feature |
Micro Resistance Slow Closing Check Valve |
Standard Check Valve |
| Closure Mechanism |
Hydraulic cylinder (5-60 sec) |
Spring or gravity (＜1 sec) |
| Water Hammer Control |
Excellent (eliminates pressure surges) |
Limited (may cause water hammer) |
| Flow Capacity |
High (Cv ≥10,000 for DN1000) |
Moderate (Cv ≤5,000 for DN1000) |
| Applications |
Large-diameter, high-flow systems |
General industrial systems |
Summarize
The Micro Resistance Slow Closing Check Valve is a robust, high-capacity solution for preventing reverse flow and mitigating water hammer in large-diameter pipelines. Its butterfly disc design, hydraulic slow-closing mechanism, and compliance with international standards make it an ideal choice for water supply networks, wastewater treatment plants, and industrial systems. By combining energy efficiency with reliable performance, this valve ensures the safety and longevity of critical infrastructure.
| Size Range |
DN200 to DN2000 (8″ to 80″) |
| Pressure Rating |
PN10 to PN25 (EN 1092) or Class 150 to Class 300 (ASME B16.34) |
| Temperature Range |
-10°C to 120°C (EPDM seals) / -20°C to 80°C (NBR seals) |
| Body Materials |
Ductile Iron (EN-GJS-400-18), Carbon Steel (WCB), Stainless Steel (CF8M) |
| Disc Material |
Ductile Iron (EN-GJS-400-18), Stainless Steel (316/304) with EPDM/NBR coating |
| Seat Material |
EPDM, NBR, or PTFE for zero leakage |
| End Connections |
Flanged (EN 1092, ASME B16.5) |
| Closure Time |
Adjustable: 5-60 seconds |
