1. Unique structure, double-sided pressure-holding design, valve strength conforms to: ASME B16, 34, API 598
2. A full range of pressure ring structures
3. All series are equipped with electrostatic guiding device structure
4. In line with explosion-proof certification: ATEX 94/9/CE Group II Category 2 GD
5. The full caliber has passed the API 607 fire test regulations
6. The leakage grade of metal valve seat conforms to ANSI FCI 70-2-2003 Table 1 CLASS IV
7. Valve shaft fugitive emissions meet EPA Method 21 test and TA-LUFT fugitive emission requirements (OPTIONS)
