OEM Ductile iron GGG40 silent check valve soft seal Suppliers, Manufacturer
Product Description
Product Specifications
| Valve Type: | Silent check valve | Structure: | Silent type |
| Standard: | API609 | Workmanship: | Investment casting |
| Sealing direction: | Single-directional | Sealing grade: | Zero leakage |
| Temperature: | -20°C<T<120°C | Operation: | Self-starting |
Characteristics
This ductile iron silent check valve is a water hammer eliminating non-slam check valve for water supply systems. Made of high-strength QT450 ductile iron with epoxy anti-corrosion coating, it features streamlined axial flow passage and spring quick-close structure for noiseless operation, low pressure loss and reliable backflow prevention. Widely used in building water supply, fire protection, HVAC and municipal water pipeline projects.
Key Advantages
The check valve silent type adopts spring-assisted quick-close structure to eliminate water hammer and pipeline noise effectively, ensuring silent and stable operation for high-standard water supply systems.
The silent check with high-strength ductile iron body with full epoxy anti-corrosion coating features excellent pressure resistance and durability for long-term pipeline service.
Streamlined axial flow design reduces flow resistance and energy consumption. Automatic backflow prevention fully protects water pumps and pipeline systems.
Material Specifications
| Part Name | Material | Part Name | Material |
| Body | GJS 500-7 | Gasket | EPDM |
| Disc | GJS 500-7+EPDM | Disc nut | ANSI 304 |
| Spring | ANSI 304 | Guide sleeve | C61900 |
| O-ring | NBR | Baffle | GJS 500-7 |
| Stem | ANSI 304 |
Dimensions & Technical Data
| Nominal Diameter | L | D | D1 | N-Φd | |||||||
| DN(mm) | NPS(in) | PN10 | PN16 | PN25 | PN10 | PN16 | PN25 | PN10 | PN16 | PN25 | |
| 50 | 2" | 150 | 165 | 165 | 165 | 125 | 125 | 125 | 4-Φ19 | 4-Φ19 | 4-Φ19 |
| 65 | 2.5" | 170 | 185 | 185 | 185 | 145 | 145 | 145 | 4-Φ19 | 4-Φ19 | 8-Φ19 |
| 80 | 3" | 180 | 200 | 200 | 200 | 160 | 160 | 160 | 8-Φ19 | 8-Φ19 | 8-Φ19 |
| 100 | 4" | 190 | 220 | 220 | 235 | 180 | 180 | 190 | 8-Φ19 | 8-Φ19 | 8-Φ23 |
| 125 | 5" | 200 | 250 | 250 | 270 | 210 | 210 | 220 | 8-Φ19 | 8-Φ19 | 8-Φ28 |
| 150 | 6" | 210 | 285 | 285 | 300 | 240 | 240 | 250 | 8-Φ23 | 8-Φ23 | 8-Φ28 |
| 200 | 8" | 230 | 340 | 340 | 360 | 295 | 295 | 310 | 8-Φ23 | 12-Φ23 | 12-Φ28 |
| 250 | 10" | 250 | 395 | 405 | 425 | 350 | 355 | 370 | 12-Φ23 | 12-Φ28 | 12-Φ31 |
| 300 | 12" | 270 | 445 | 460 | 485 | 400 | 410 | 430 | 12-Φ23 | 12-Φ28 | 16-Φ31 |
Application Scenarios
This silent check valve is widely used in high-rise building water supply pump rooms, municipal water supply pipelines, fire protection systems, HVAC circulating water, hospital and hotel silent water supply projects, industrial water circulation and smart water pipe network systems.
Packaging Details
Standard export wooden case packaging
Frequently Asked Questions
The silent check valve is engineered to permit fluid flow in one direction while automatically closing to prevent backflow. It features a spring-loaded design that eliminates destructive water hammer and system noise in water supply pipelines.
Before backflow occurs, the high-tensile stainless steel spring automatically pushes the valve disc to close against the seat. This quick shut-off prevents water column reversal, eliminating non-slam noise and mechanical shock.
Our silent check valves comply with API609 manufacturing standards and support PN10, PN16, and PN25 pressure ratings, making them compatible with various international pipeline specifications.
Yes, thanks to its axial flow design and spring-guided mechanism, the valve can be installed in horizontal, vertical, or inclined pipelines without compromising sealing performance.
Yes, the valve body is constructed from high-strength QT450 ductile iron and fully coated internally and externally with eco-friendly epoxy resin, providing superior anti-corrosion protection and ensuring clean water delivery.
