These units are used especially on heavy machinery.
The user can install the valves in the most convenient place, but it is recommended, in case the unit is used without box, to use it in a relatively clean area away from water and dust.
This system ensures safe and always checked operation even in those cases in which working conditions could make impossible to use any other kind of dispenser.
These metering valves are the double checking version of some Double line metering valves. The use of these units is required where the guarantee of absolute good functioning is required for both dispenser's outputs. Each tower is in contact with a microswitch, which gives an electronic signal whenever the equipment feeds the system.