Leakage standard
GB/T4213.92| leaking grade | test medium | test pressure | maximum seat leaking volume1/h |
| Ⅰ | decided by customer and manufacture | ||
| Ⅱ | water, air, nitrogen | A | 5×10-3× rated capacity |
| Ⅲ | 10-3× rated capacity | ||
| Ⅳ | water | A or B | 10-4× rated capacity |
| air, nitrogen | A | ||
| Ⅳ-S1 | water | A or B | 5×10-4× rated capacity |
| air, nitrogen | A | ||
| Ⅳ-S2 | air, nitrogen | A | 2×10-4×△P×D |
| V | water | B | 1.8×10-7×△P×D |
| VI | air, nitrogen | A | 3×10-3×△P(Renewal table leaking volume) |
| seat diameter | 20 | 25 | 40 | 50 | 65 | 80 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | |
| leakage | ml/min | 0.1 | 0.15 | 0.3 | 0.45 | 0.6 | 0.9 | 1.7 | 4.0 | 6.75 | 11.1 | 16.0 | 21.6 | 28.4 |
| bubble number /min | — | 1 | 2 | 3 | 4 | 6 | 11 | 27 | 45 | — | — | — | — | |
Note: 1. Every minute bubble numbers is used outside diameter 6mm, wall thickness 1mm tubes vertical submerged underwater 5 ~ 10mm depth conditions to measure, the pipe surface should be smooth.
2. If the seat diameter and listed value differ aboveo 2mm, leaking coefficient can be assumed leakage and seat diameter is directly proportional to the situation through internal extrapolation to obtain.
ANSI B16.104-197
| leaking grade | maximum allowed leakage | test medium | test pressure | |||
| Ⅱ | 0.5%Cv | 10～52℃ air or water | maximum working pressure differential △P or 501b/in2 pressure differential, take the lower one |
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| Ⅲ | 0.1%Cv | 10～52℃ air or water | maximum working pressure differential △P or 501b/in2 pressure differential, take the lower one |
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| Ⅳ | 0.01%Cv | 10～52℃ air or water | maximum working pressure differential △P or 501b/in2 pressure differential, take the lower one |
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| V | when each inch nominal diamter and pound/inch 2 pressure differential, allowed 0.0005 ml/min leaking water. |
10～52℃ water | △Pmaximum working pressure differential △P |
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| Ⅵ | Nominal diameter | ml/min | Bubble number /min | 10～52℃ air or nitrogen | maximum working pressure differential △P or 501b/in2 pressure differential, take the lower one |
|
| in | mm | |||||
| 1 | 25 | 0.15 | 1 | |||
| 1.5 | 38 | 0.30 | 2 | |||
| 2 | 51 | 0.45 | 3 | |||
| 2.5 | 64 | 0.60 | 4 | |||
| 3 | 76 | 0.90 | 6 | |||
| 4 | 102 | 1.70 | 11 | |||
| 6 | 152 | 4.00 | 27 | |||
| 8 | 203 | 6.75 | 45 | |||
