1. Compact structure, reasonable design, good valve rigidity, smooth passage and small flow coefficient;

2. The sealing surface is made of stainless steel and hard alloy, with long service life;

3. Flexible graphite packing, reliable sealing, easy and flexible operation;

4. The driving mode is manual, pneumatic, electric and gear transmission;

5. The structure type is elastic wedge single ram, rigid wedge single ram double ram.