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| flapper valve; reverse check valve; single-pass valve; swing check valve | |||
| ball-and-seat; check valve | |||
| 单流阀: 18 phrases in 6 subjects |
| Compressors | 1 |
| Drilling | 6 |
| General | 1 |
| Metallurgy | 1 |
| Technology | 7 |
| Wind Energy | 2 |
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