Dual Plate Check Valve
MODEL NO. DD
PRESSURE DROP CHART
Specification
| Size | 2″(50A) ~ 60″(1500A) | ||
| Service | Oil, Water, Air, Steam, Sea Water..etc. | ||
| Rating | JIS 10K, JIS 20K, Class 150~2500, AWWA C207..etc. | ||
| Pipe connections | Water, Lug, Double, Flange, Buttwelding, Hub | ||
| Materials | ①Body | Cast Iron, Stainless Stell, Duplex, NI_AI_Bronze..etc. | |
| ②Disc | Stainless Steel, Duplex, NI_AL_Bronze..etc. | ||
| ③Pin | Stainless Steel, Duplex, NI_AL_Bronze..etc. | ||
| ④Spring | Stainless Steel, Inconel..etc. | ||
| ⑤Seat | Rubber, PTFE, Stainless Steel, Stellite Overlay. | ||
Flow Characteristics
[Flow Coefficient]
| Size | Kv | Cv | |
| in | mm | ||
| 2 | 50 | 54 | 62 |
| 2½ | 65 | 76 | 88 |
| 3 | 80 | 148 | 171 |
| 4 | 100 | 318 | 368 |
| 5 | 125 | 420 | 485 |
| 6 | 150 | 738 | 853 |
| 8 | 200 | 1323 | 1530 |
| 10 | 250 | 2418 | 2795 |
| 12 | 300 | 3598 | 4160 |
| 14 | 350 | 4963 | 5738 |
| 16 | 400 | 7382 | 8534 |
| 18 | 450 | 9290 | 10740 |
| 20 | 500 | 12240 | 14150 |
| 25 | 600 | 19800 | 22890 |
[Flow rete rate for full open]
| Size | Critical velocity (m/s) | Critical Flow rate (m3/hr) | |
| in | mm | ||
| 2 | 50 | 1.5 | 11 |
| 2½ | 65 | 1.5 | 18 |
| 3 | 80 | 1.7 | 30 |
| 4 | 100 | 2.2 | 61 |
| 5 | 125 | 2.0 | 87 |
| 6 | 150 | 2.1 | 136 |
| 8 | 200 | 2.4 | 268 |
| 10 | 250 | 2.2 | 395 |
| 12 | 300 | 2.2 | 560 |
| 14 | 350 | 2.0 | 687 |
| 16 | 400 | 2.2 | 987 |
| 18 | 450 | 2.0 | 1129 |
| 20 | 500 | 2.3 | 1642 |
| 25 | 600 | 2.4 | 2487 |