The check valve is characterized by a one-way pressure-containing valve, allowing fluid to flow in one direction. It is divided into forward check valve and reverse check valve.

The forward check valve allows fluid to flow from the top down.

The reverse check valve allows fluid to flow from the bottom up.

17. FEATURES:

50. Compatible with standard tubing or packer; 
50. Simple structure, convenient installation and proper cost;
50. High strength, applicable pressure rating 10000PSI[69.0MPa]。