1. Small and light, easy to disassemble and repair, and can be installed at any position;

2. Simple and compact structure, quick 90 ° swing opening;

3. Small operating torque, labor saving and light;

4. The flow characteristics tend to be straight, and the regulation performance is good;

5. The number of opening and closing tests is up to tens of thousands, and the service life is long;

6. The sealing elements can be replaced, and the sealing is reliable to achieve two-way sealing. The gas test leakage is zero;

7. The sealing material is aging resistant, corrosion resistant and suitable for various media.