There is no spring return function on the double-solenoid valve.
The position is attained by activating the coils in this sort of valve.
When voltage is delivered to a solenoid coil, the double solenoid valve is reversed and remains in this switching state until an opposing signal is applied.
It comes in various port sizes from 1/8″, 1/4″, 3/8″, 1/2″. And various voltages available are 230V AC, 24V DC, 110V AC, 24VDC, 12V DC