Control valveLeakage standard
National standard GB/T4213.92
| Leakage level | Test medium | test pressure | Maximum seat leakage 1/h |
| I | Determined by users and manufacturers | ||
| Ⅱ | Water, air or nitrogen | A | 5×10-3× valve rated capacity |
| Ⅲ | 10-3×rated capacity of valve | ||
| Ⅳ | Wed | A or B | 10-4×rated capacity of valve |
| Air or nitrogen | A | ||
| Ⅳ-S1 | Wed | A or B | 5×10-4× valve rated capacity |
| Air or nitrogen | A | ||
| Ⅳ-S2 | Air or nitrogen | A | 2×10-4×△P×D |
| V | Wed | B | 1.8×10-7×△P×D |
| VI | Air or nitrogen | A | 3×10-3×△P(Continued table of leakage) |
续表
| Valve 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 |
| Number of bubbles/min | — | 1 | 2 | 3 | 4 | 6 | 11 | 27 | 45 | — | — | — | — | |
注：1.每分钟气泡数是用外径6mm、壁厚1mm的管子垂直浸入水下5~10mm深度的条件下测得的，管端表面应光滑。
2. If the valve seat diameter differs from one of the table values by more than 2mm, the leakage coefficient can be obtained by interpolation, assuming that the leakage is proportional to the square of the valve seat diameter.
American Standard ANSI B16.104-197
| Leakage level | Maximum allowable leakage | Test medium | test pressure | |||
| Ⅱ | 0.5%Cv | 10～52℃ air or water | Maximum working pressure difference △P or 501b/in2 pressure difference, whichever is lower |
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| Ⅲ | 0.1%Cv | 10～52℃ air or water | Maximum working pressure difference △P or 501b/in2 pressure difference, whichever is lower |
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| Ⅳ | 0.01%Cv | 10～52℃ air or water | Maximum working pressure difference △P or 501b/in2 pressure difference, whichever is lower |
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| V | At nominal diameter per inch and 2 pressure difference per pound/inch, Allow 0.0005ml/min of water leakage |
10～52℃ water | Maximum working pressure △P |
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| Ⅵ | Valve nominal diameter | ml / min | Number of bubbles/min | 10～52℃ air or nitrogen | Maximum working pressure difference △P or 501b/in2 pressure difference, whichever is lower |
|
| 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 | |||