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Advantage:
Has the lowest flow resistance
Closure pieces can withstand high pressure drop off
Can achieve fast opening and closing, opening and closing time of some institutions only 0.05s-0.1s, to ensure that the test bed can be used in automation systems.
Compact structure, small size, light weight.

| DN | A | B | C | D | E | G |
| 15 | 51 | 13 | 12 | 12 | 90 | 1/2 |
| 20 | 56 | 18 | 12 | 12 | 90 | 3/4 |
| 25 | 66 | 22.5 | 13 | 13 | 110 | 1 |
| 32 | 77 | 28 | 14.5 | 14.5 | 140 | 1 1/4 |
| 40 | 87.4 | 35 | 15.5 | 15.5 | 140 | 1 1/2 |
| 50 | 102.2 | 44 | 17.5 | 74 | 155 | 2 |