1. Compact structure, installation at any angle-convenient for piping;

2. Streamlined runner, low noise, energy saving and environmental protection;

3. Long service life, no jamming for opening and closing, and reliable operation;

4. Low pressure sealing and low pressure opening-fire protection system is preferred;

5. Zero leakage-traditional check valve is incomparable;

6. There are many types of valve clack structures, which can be widely used.