The Silent Check Valve is the preferred choice in applications where silent operation and cost are of major concern. Its short linear stroke and spring return action combine to close the valve prior to flow reversal which effectively eliminates the shock and water hammer normally associated with the sudden stoppage of a reverse flow.
YIFA Silent Check Valves are used in a variety of liquid, air, and gas applications to prevent flow reversal and associated water hammer, vibration, and surges. They are available in a range of configurations and sizes, including compact dimensions for limited spaces -- as well as multiple pressure classes and material construction.
| DN | L | b | N-φd | D | K | D1 |
| 40 | 116 | 18 | 4-φ18 | 150 | 110 | 84 |
| 50 | 126 | 20 | 4-φ18 | 165 | 125 | 99 |
| 65 | 140 | 20 | 4-φ18 | 185 | 145 | 118 |
| 80 | 155 | 22 | 8-φ18 | 200 | 160 | 132 |
| 100 | 165 | 24 | 8-φ18 | 220 | 180 | 156 |
| 125 | 188 | 26 | 8-φ18 | 250 | 210 | 184 |
| 150 | 215 | 26 | 8-φ22 | 285 | 240 | 211 |
| 200 | 250 | 30 | 12-φ22 | 340 | 295 | 266 |
| 250 | 290 | 32 | 12-φ26 | 405 | 355 | 319 |
| 300 | 313 | 32 | 12-φ26 | 460 | 410 | 370 |
1.Design and manufacture according to GB/T12233.
2.Face to Face according to GB/T12221.
3.3.Flange drilling according to GB/T 17241
