DN800 PN16 Ductile Iron Double Door Wafer Check Valve
Basic Info of Double Door Wafer Check Valve
Double Door Wafer Check Valve is a type of check valve used to prevent backflow in piping systems.
It consists of two half-plates hinged together and placed in the center of the valve body.
- The valve body is made from GGG40 ductile iron. It is known for its excellent mechanical properties, including high tensile strength and impact resistance, ensuring reliable performance under high pressure and stress.
- Double Door Wafer Check Valve is equipped with dual CF8 discs. It offers superior corrosion resistance and long-lasting durability, particularly in aggressive environments.
- The wafer design allows for easy installation between flanges, saving space and reducing the overall weight of the system.
- The characteristic of the wafer structure is the short FTF length, so it is convenient for installation in tight spaces.
- Designed for long-term performance, minimal maintenance requirements, reducing downtime and operating costs.
Standard of Dual Discs Wafer Check Valve
| ITEM | Standard |
| Design | EN593 | API609 |
| Face to Face | API 594 |
| Flange Drilling | PN6 | PN10 | PN16 | ASME B16.5 CL150 |
| Tightness Test | API598 |
Parts of Double Door Wafer Check Valve
| Parts | Ductile Iron type | WCB type | Stainless Steel Type | Duplex Stainless Steel Type |
|---|---|---|---|---|
| Body | Cast Iron(GG25) | A216 | SS304/ CF8 | 2205 |
| Ductile Iron(GGG40/50) | A217 | SS316/CF8M | 2507 | |
| A105(forged) | SS304L/CF3 | 1.4529 | ||
| SS316L/CF3M | ||||
| Disc | Ductile Iron with Ni coated | SS304/ CF8 | 2205 | |
| Stainless Steel | SS316/CF8M | 2507 | ||
| Duplex Stainless Steel | SS304L/CF3 | 1.4529 | ||
| Alumium Bronze(95400/95500/95800) | SS316L/CF3M | |||
| 2205 | ||||
| 2507 | ||||
| 1.4529 | ||||
| Seat | NBR, EPDM, PTFE, Viton, Stainless Steel, Duplex Stainless Steel, Stellite | |||
| Stem | SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel | Duplex Stainless Steel, Monel | ||
Paraments of Dual Discs Wafer Check Valve
| DN | D | D1 | D2 | L | R | t | weight（kg） | |
|---|---|---|---|---|---|---|---|---|
| mm | inch | |||||||
| 50 | 2″ | 107 | 65 | 43.3 | 43 | 28.2 | 19 | 1.5 |
| 65 | 2.5″ | 127 | 80 | 60.2 | 46 | 36.1 | 20 | 2.4 |
| 80 | 3″ | 142 | 94 | 66.4 | 64 | 43.4 | 28 | 3.6 |
| 100 | 4″ | 162 | 117 | 90.8 | 64 | 52.8 | 27 | 5.7 |
| 125 | 5″ | 192 | 145 | 116.9 | 70 | 65.7 | 30 | 7.3 |
| 150 | 6″ | 218 | 170 | 144.6 | 76 | 78.6 | 31 | 9.0 |
| 200 | 8″ | 273 | 224 | 198.2 | 89 | 104.4 | 33 | 17 |
| 250 | 10″ | 328 | 265 | 233.7 | 114 | 127 | 50 | 26 |
| 300 | 12″ | 378 | 310 | 283.9 | 114 | 148.3 | 43 | 42 |
| 350 | 14″ | 438 | 360 | 332.9 | 127 | 172.4 | 45 | 55 |
| 400 | 16″ | 489 | 410 | 381.0 | 140 | 197.4 | 52 | 75 |
| 450 | 18 | 539/555 | 450 | 419.9 | 152 | 217.8 | 58 | 101/107 |
| 500 | 20″ | 594 | 505 | 467.8 | 152 | 241 | 58 | 111 |
| 600 | 24″ | 690 | 624 | 572.6 | 178 | 295.4 | 73 | 172 |
| 700 | 28″ | 800 | 720 | 680 | 229 | 354 | 98 | 219 |
Application of Twin Doors Check Valve
The main function of a check valve is to prevent backflow of the medium in a pipeline. Double-disc check valves are among the most commonly used types because of their compact structure, rapid opening and closing, and low pressure loss.
-
Water supply system – Prevents backflow in municipal and pump pipelines.
-
HVAC system – Used in chilled water and circulation systems.
-
Fire protection system – Installed at fire pump discharge lines.
-
Industrial pipeline – Suitable for general industrial fluid control.
-
Power plant system – Applied in cooling and auxiliary pipelines.
-
Wastewater treatment – Used in sewage and discharge pipelines.
-
Marine system – Suitable for ballast and cooling water systems.
Certificates of ZFA Valve
WRAS
CE
ISO 9001
EAC Russia
