1. The new arrow check valve adopts spherical sealing design, with reliable sealing, simple valve seat structure and increased overflow area.

2. The sealing surface adopts cemented carbide or cermet, which is not easy to deform and has good sealing effect.

3. The valve core and valve seat adopt special layers, which have the characteristics of high hardness, erosion resistance, anti-corrosion and long service life.

4. The inner cavity is sprayed with anti-corrosion and anti erosion coating, which has strong anti erosion ability.

5. Two seals are designed on both sides of the spring to protect the spring from erosion.