The magnetically-coupled actuator system along with a testing tool allows for primary functionality testing of the Defender Series® overfill prevention valve (OPV) without having to remove the assembly from the riser. Use the following procedures to carry out Defender Series® OPV inspection.
To identify that you are inspecting a Defender Series® OPV, use these distinguishing visual indicators without removing the drop tube assembly.
- Locate the name plate which should be affixed to the fill point within the spill container.
- Use an appropriate light source, such as an explosion proof flash light, to illuminate the drop tube – identify the black color and 5 stick deflector ribs.
The operational functionality of a Defender Series® OPV can be done easily from grade without having to remove the drop tube assembly using the collapsible 11’ (3,353mm) remote testing tool shown below (P/N 708534901).
- Insert the remote test tool into the drop tube. You should feel a “pull” when the magnets are positioned correctly and attract.
- Slowly raise the remote test tool about 1 ½” (38mm) and you should see the flapper move into the flow path.
- If the flapper is observed moving back and forth, the valve is functioning normally.
You can verify the correct installation of a Defender Series® OPV at 95% level without having to remove the drop tube assembly using the measurements and the calculation worksheet in the Tech Update PDF.
View or download a copy of the Tech Update Defender Series Overfill Prevention Valve Inspection Without Removal From Tank here.