Marine pressure reducing valve CB/T3656-1994
Figure 1 – Main external connection dimensions
| DN | L | D | D1 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| PN16, 25 | PN40 | 30K | PN16 | PN25 | PN40 | 30K | PN16 | PN25 | PN40 | 30K | |
| 20 | 160 | 160 | 160 | 105 | 105 | 105 | 120 | 75 | 75 | 75 | 85 |
| 25 | 180 | 200 | 180 | 115 | 115 | 115 | 130 | 85 | 85 | 85 | 95 |
| 32 | 200 | 220 | 200 | 140 | 140 | 140 | 140 | 100 | 100 | 100 | 105 |
| 40 | 220 | 240 | 220 | 150 | 150 | 150 | 150 | 110 | 110 | 110 | 120 |
| 50 | 250 | 270 | 250 | 165 | 165 | 165 | 165 | 125 | 125 | 125 | 130 |
| 65 | 280 | 300 | 280 | 185 | 185 | 185 | 185 | 200 | 145 | 145 | 160 |
| 80 | 310 | 330 | 310 | 200 | 200 | 200 | 200 | 210 | 160 | 160 | 170 |
| 100 | 350 | 380 | 350 | 220 | 220 | 235 | 235 | 240 | 180 | 190 | 195 |
Figure 2 – Main external connection dimensions (threaded connections)
| Nominal Diameter DN1 | Nominal Diameter DN2 | Structure dimension | External thread connection – Import | External thread connection – Exportation | Weight (kg) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | H | h | D1 | D2 | D3 | l1 | l2 | D4 | D5 | D6 | l3 | l4 | |||
| 15 | 20 | 210 | 263 | 99 | M36×2 | 33 | 22 | 22 | 5 | M39×2 | 36 | 25 | 23 | 5 | 6.57 |
| 20 | 25 | 229 | 395 | 121 | M39×2 | 36 | 25 | 23 | 5 | M48×2 | 45 | 32 | 26 | 6 | 22.30 |
| 25 | 32 | — | — | — | M48×2 | 45 | 32 | 26 | 6 | M56×2 | 53 | 38 | 28 | 6 | 27.30 |
Pressure relief valve pressure graduation – Table 1
| Pressure graduation | Inlet pressure P1 (MPa) | Outlet pressure P2 (MPa) | Applicable medium |
|---|---|---|---|
| A | 3.0 | 1.0 ~ 0.7 | Air |
| B | < 0.7 ~ 0.2 | ||
| C | 1.0 | 0.4 ~ 0.05 |
Technical data – Table 2
| Nominal Diameter (mm) | Inlet pressure P1 (MPa) | Outlet reduced pressure P2 (MPa) | ||
|---|---|---|---|---|
| Import DN | Exportation DN | 3.0 | 1.0 | |
| 15 | 20 | 1.0 ~ 0.7 | < 0.7 ~ 0.2 | 0.4 ~ 0.05 |
| 20 | 25 | 1.0 ~ 0.7 | < 0.7 ~ 0.2 | 0.4 ~ 0.05 |
| 25 | 32 | (data not filled) | (data not filled) | (data not filled) |
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