The Model JA ESV is an inline valve that holds a bubble-tight, open position until flowing pressure acting on the unbalanced stem area puts an axial force on the pin. At set point, the pin buckles and the valve closes for a bubble-tight seal. This model isolates pressure to prevent downstream damage to equipment and proves it is environmentally friendly by eliminating air and ground pollution common with conventional relief valves.

The Model J-A isolation valve closes at a set pressure to prevent damage to downstream equipment from excess pressure including meter houses and line
transitions.