The 106 / 206-SC is a solenoid control valve has a globe or angle styled body. It has a simple on-off operation. The singer models are based on the models 106-PG and 206-PG. It lets inlet pressure into the main valve operating chamber or releases pressure from the operating chamber.
If the main valve closes when the solenoid loses energy or when the main valve opens when the solenoid loses energy, the SC valve is available.
In order to lessen the pressure drop on low flows, the exhaust of the solenoid valve can be piped down to drain.