Q. Why use variable voltage to activate the valve?
A. Roll-Over shut valves are an electro-mechanical device. Like most solenoid valves, the solenoid requires more voltage/current to initially close then it does for the valve to remain in a closed state.
Using pulse width modulation, the ROVCM is able to apply a higher voltage (16.4 to 16.6 volts) to the Roll-Over shut off valve. The higher voltage creates a stronger magnetic field within the valve solenoid coil, which in turn increases the shut-off valve’s closing strength by approximately 170% over normal battery voltage alone.
By increasing the valve closing strength by approximately 170%, it allows the valve to close faster/stronger under a wider range of riding/temperature conditions.
Once the valve has closed the ROVCM reduces the output voltage
(normally 8.5 volts) to keep the valve closed.