Specifications

check valve:
1.it is an internal preventer.
2.It consists of back pressure sub and check valve assembly.

check valve

1. drop-in check valve is an internal preventer.
2. It consists of back pressure sub and check valve assembly.

 

Back pressure sub is connected with stop ring and tightened on and put into downhole with drill string. Back pressure sub is used as a sub above drill string before check valve assembly is run into downhole.