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GB/T 1852 Marine flange cast steel steam pressure reducing valve
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GB/T 1852 -2008 Basic parameters of marine flange cast steel steam pressure reducing valve：
| Nominal diameterDN/mm | Inlet pressure p1/MPa | Outlet pressurep2/MPa | Applicable media | ||||||||||||
| 15～200 | 0.4～2.5 | 0.2～0.6 | Ship steam pipelines not exceeding 300℃ | ||||||||||||
| 0.6～1.2 | |||||||||||||||
Note: The pressure difference between the inlet pressure and the outlet pressure should not be less than 0.2MPa
Main parts materials：
| Part Name | Material | |||||||||||||||
| Type | Brand | standard encdoing | ||||||||||||||
| Main valve body, auxiliary valve body upper cover, lower cover | Cast Steel | ZG275-485 | GB/T 12229-2005 | |||||||||||||
| Diaphragm | Tin Bronze | QSn6.5-0.1 | GB/T 2040-2002 | |||||||||||||
| Main valve spring, auxiliary valve spring | Chrome vanadium spring steel wire | 50CrVA | YB/T5318-2006 | |||||||||||||
| Adjustment spring | Silicon manganese spring steel wire | 60Si2Mn | ||||||||||||||
| Main valve disc, auxiliary valve disc | Stainless steel | 2Cr13 | GB/T 1220-1992 | |||||||||||||
A Basic dimensions of pressure reducing valve：
| Nominal diameter DN/ mm | structure size | Wall thickness/t | Flange connection size | Theoretical weight/kg | |||||||||||||||
| Import/PN2.5MPa | Export /PN1.6MPa | ||||||||||||||||||
| L | H | h | D1 | D2 | D3 | b1 | d1 | bolt | D4 | D5 | D6 | b2 | d2 | bolt | |||||
| n1 | Th1 | n2 | Th2 | ||||||||||||||||
| 25 | 170 | 250 | 75 | 6 | 105 | 73 | 73 | 12 | 13 | 4 | M12 | 105 | 73 | 73 | 12 | 13 | 4 | M12 | 15.00 |
| 32 | 115 | 83 | 83 | 13 | 15 | 6 | M14 | 115 | 83 | 83 | 13 | 15 | 6 | M14 | 16.00 | ||||
| 40 | 200 | 260 | 80 | 7 | 125 | 93 | 93 | 125 | 93 | 93 | 21.00 | ||||||||
| 50 | 210 | 270 | 85 | 135 | 103 | 103 | 135 | 103 | 103 | 23.00 | |||||||||
| 65 | 240 | 290 | 115 | 170 | 132 | 132 | 15 | 17 | 8 | M16 | 170 | 132 | 132 | 15 | 17 | 8 | M16 | 24.00 | |
| 80 | 300 | 185 | 147 | 147 | 16 | 185 | 147 | 147 | 16 | 40.00 | |||||||||
| 100 | 280 | 320 | 120 | 8 | 205 | 167 | 167 | 10 | 205 | 167 | 167 | 10 | 43.00 | ||||||
| 125 | 330 | 350 | 150 | 9 | 240 | 196 | 196 | 19 | 21 | M20 | 225 | 187 | 168 | 72.00 | |||||
| 150 | 380 | 360 | 190 | 11 | 270 | 226 | 226 | 20 | 12 | 255 | 217 | 196 | 20 | 12 | 90.00 | ||||
| 200 | 470 | 425 | 225 | 13 | 340 | 291 | 260 | 25 | 26 | M24 | 325 | 281 | 254 | 21 | M20 | 120.00 | |||
AS型减压阀的基本尺寸：
| Nominal diameter DN/ mm | structure size | Wall thickness/t | Flange connection size | Theoretical weight/kg | |||||||||||||||
| Import/PN2.5MPa | Export /PN1.6MPa | ||||||||||||||||||
| L | H | h | D1 | D2 | D3 | b1 | d1 | bolt | D4 | D5 | D6 | b2 | d2 | bolt | |||||
| n1 | Th1 | n2 | Th2 | ||||||||||||||||
| 25 | 170 | 250 | 75 | 6 | 115 | 85 | 68 | 16 | 14 | 4 | M12 | 115 | 85 | 68 | 16 | 14 | 4 | M12 | 16.00 |
| 32 | 140 | 100 | 78 | 18 | 18 | M16 | 140 | 100 | 78 | 18 | 18 | M16 | 17.00 | ||||||
| 40 | 200 | 260 | 80 | 7 | 150 | 110 | 88 | 150 | 110 | 88 | 22.00 | ||||||||
| 50 | 210 | 270 | 85 | 165 | 125 | 102 | 20 | 165 | 125 | 102 | 20 | 24.00 | |||||||
| 65 | 240 | 290 | 115 | 185 | 145 | 122 | 22 | 8 | 185 | 145 | 122 | 26.00 | |||||||
| 80 | 300 | 200 | 160 | 133 | 24 | 200 | 160 | 133 | 8 | 42.00 | |||||||||
| 100 | 280 | 320 | 120 | 8 | 235 | 190 | 158 | 22 | M20 | 220 | 180 | 158 | 22 | 43.00 | |||||
| 125 | 330 | 350 | 150 | 9 | 270 | 220 | 184 | 26 | 26 | M24 | 250 | 210 | 184 | 74.00 | |||||
| 150 | 380 | 360 | 190 | 11 | 300 | 250 | 212 | 28 | 285 | 240 | 212 | 24 | 22 | 96.00 | |||||
| 200 | 470 | 425 | 225 | 13 | 360 | 310 | 278 | 30 | 12 | 340 | 295 | 268 | 12 | M20 | 127.00 | ||||
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