The valve itself(sanhua kmv432) is designed for 230V AC/50Hz. But to switch it from state to another you need minimum of 4 half wave pulses(10 pulses recomended) in the right direction. So the voltage on the valve itself is cut approximatly in half, becouse i cut off half of ac signal via 1N4007 diode.
I plugged the valve into 230V 50Hz source, via the diode, and measure the voltage drop on the valve and then changed the direction of diode and measure again. In both circumcates the voltage was 168-172V and current was 21-23mA. This also goes hand in hand well whit what i calculated and expected to see before measurement. I also confirmed that valve actualy switches state when i changed the direction of current flow.
So now that i know that this system works, i just need to wait for my optocoupler darlington(SFH619A) to arrive and use 2 of them to choose what direction the current will flow.
There is circuit diagram of it in attachement. Im turning on/off optocouplers via atmega328P, and the V1 and V2 are terminal to plug in valve in serial connection whit 230V 50Hz power supply.