Hi A
As MS said get rid or it. Because it is installed in the vertical for it to operate it would need a spring and that would need a pressure differential to open so the pressure either side of the valve would probably be different, kind of defeats the purpose of having an equaliser line to a degree.
I would ask how often the orifices have to be changed and if it is very often I would be looking for other issues in the system.
Regards
Paul