Actuator for 24V AC solenoid valves?

[Jeecha]

What type of actuator would be best fit to control 24V AC solenoid valves for irrigation and water distribution? The solenoids are roughly 150mA under load and up to 300mA inrush current.

Possible options:
1) Thyristor based KNX heating actuator for 24/220V AC thermoelectric valves. This should technically work, provided the heating actuator can switch sufficient current. Only possible problem - heating thermoelectric valves are resistive load, while solenoid valves are inductive load, which could damage the actuator. Sadly actuator data sheets only list the maximum current, but not the type of load they can safely switch;
2) Regular switching actuator with bi-stable relays. Problem could be that on KNX bus power loss the relays would remain latched in previous state, thus keeping valves open without control if power is lost on KNX bus, but not on transformer for valve drives;
3) Separate irrigation controller, with some kind of integration with KNX (for example Hunter with Hydrawise API)

[concept]

all 3 versions can work. but to use heating actuators is not very common.

with standard actuators you can usually configurate, what they do when the bus power disappears or re-appears.

but with all control principles you dont have any guarantee, that a hunter (or similar) valve is closed, when there is no control voltage. i had already twice a „hanging“ valve. to measure/control the water consuption per day is a good practice to detect problems.

[Jeecha]

but with all control principles you dont have any guarantee, that a hunter (or similar) valve is closed, when there is no control voltage. i had already twice a „hanging“ valve. to measure/control the water consuption per day is a good practice to detect problems.

Two meters will be installed anyway, as they are required by utilities company for sewage billing - one meter right at the input into home from well pump, the second meter on the branch which goes to irrigation. This is as per their requirements, but it fits integration with smart home very well. Meters will be equipped with impulse output modules, so consumption and flow can be used for automation. Every room with water supply will also be equipped with a leak sensor.

Water supply is by a pump, so the power supply line for pump will be through a switch actuator to turn it off in case of an emergency.

[hjk]

Version 1 doesn‘t work, because induktive loads are not allowed.