Product Features
Sight glass is one of the main accessories on industrial pipeline installations. In the pipelines of industrial production equipment such as petroleum, chemical industry, medicine, food, etc., sight glasses can observe the flow and reaction of liquid, gas, steam and other media in the pipeline at any time to monitor The role of production and avoiding accidents in the production process. Example: Choose single-pressure flange connection type sight glass, internal structure swing plate type, flange nominal pressure is 0.6MPa, nominal diameter 80mm, main material is low carbon steel.
Representation method: SG-II-P-0.6-80/A
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Types of | Wafer type | Single pressure type | Tube type | Float type | Frame type | Frame single pressure type | Pressure vessel sight glass | other |
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| Full thread | Threaded connection |
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Connection Type | Flange | Flange | Thread | Flange | Thread | Flange | Flange | Flange |
| With neck | Flange |
Codename | I | II | IIIa | IIIb | Ⅳ | Va | Vb | Ⅵ | Ⅶ | Ⅷ a | Ⅷ b | IX |
structure type | Straight neck | Neck down | Off-necked | Neckless | Swing | Float |
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Schematic diagram |
Codename | A | B | C | D | E | F |
Note: The structure of this table is mainly for type I, type II and type III
1. SG-III single pressure type sight glass
Nominal diameter
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| PN0.6 | PN1.0, 1.6 | PN2.5 |
Window diameter W | Tube inner diameter D |
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| H | L | H | L | H | L |
50 | 80/80 | 65/50 | 200 | 220 | 200 | 220/250 | 210 | 250/270 |
65 | 102/100 | 80/102 | 230 | 250 | 230 | 250/270 | 240 | 270/320 |
80 | 102/102 | 102/102 | 245 | 270 | 245 | 270/270 | 275 | 320/380 |
100 | 125/125 | 125/125 | 330 | 320 | 330 | 320/320 | 360 | 360/420 |
125 | 150/150 | 150/150 | 340 | 360 | 360 | 370/400 | 400 | 310/480 |
150 | 200/200 | 200/200 | 350 | 420 | 420 | 430/440 | 440 | 480/550 |
Note: The denominator is a swing-plate single-pressure sight glass. Working pressure ≤ 1.0MPa, working temperature 0～180℃
2. SG-VII tube type sight glass
DN | D | V | H | L | Applicable working conditions |
15 | 32 | 80 | 70 | 220 |
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20 | 45 | 80 | 70 | 220 |
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25 | 58 | 80 | 70 | 220 | PN ≤ 0.25MPa |
40 | 74 | 80 | 70 | 220 | Working pressure ≤ 0.1MPa |
50 | 89 | 80 | 80 | 240 | Working temperature ≤ 80℃ |
65 | 110 | 80 | 80 | 240 |
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3. SG-IXa single-pressure reducing mirror
DN1 × DN2 |
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L | D | PH2.5 | PH0.6 | Applicable working conditions |
25 × 32 | 260 | 95 | 226 | 234 |
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41 × 50 | 320 | 140 | 226 | 278 |
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50 × 65 | 320 | 140 | 226 | 278 | PN ≤ 0.25MPa |
65 × 80 | 360 | 165 | 300 | 308 | Working temperature 0-180℃ |
80 × 100 | 360 | 165 | 300 | 308 |
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