@jolaca01: yes, the boosted 24V DC is an impulse voltage and the exact voltage isn’t critical. In fact, a higher voltage has the advantage of helping to energize the solenoid more strongly. Also, even if the voltage is critical, it can be changed in software (by basically controlling the boosting time so that the boosting stops after the voltage rises to about 9V).
The only exception I’ve seen that requires some slight modifications is the Gardena 1251 valve, as I documented here:
https://opensprinkler.com/gardena-1251-using-osbee/