The OPW FSA-400 4" threaded riser face seal adapter is installed on the fill pipe below the spill container to provide a true sealing surface for the drop tube flange on the 61SO and 71SO overfill prevention valve. The 61SO and 71SO series valves are installed in the base of the OPW EVR spill container with the patent-pending 61JSK Jack Screw device. This configuration allows liquid in the spill container to be drained directly into the drop tube thereby isolating the drain valve from the tank ullage, eliminating a notorious leak point in previous systems.
- • 4" face seal adapter
- • Provides a flat, true sealing surface on threaded pipes where a gasket seal exists per EVR requirements
- • Installed on the fill pipe riser below the spill container to provide a true sealing surface for the drop tube flange on the overfill prevention valves
- • Required on tank gauging risers and optional on vapor risers and rotatable adapters