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To retain a column of fluid in tubing string.
The BT FB2 Standing Valve consists of fourteen components:
2. Equalizing Sleeve
3. Ball Seat
4. Bypass Mandrel
5. Packing Mandrel
6. Packing Nut
11. Shear Screw
12. Double Male Backup
14. Female Backup Ring
The BT FB2 is generally placed in the tubing string when there is a need to retain fluid from being reabsorbed back into the wellbore formation.
A good example if this would be above a submersible pump.