Are there any 3 port motorised valves (preferable cheap) that do not require a constant mains current to flow when the value is either open or closed (ie it just needs current while actually opening or closing)?
I'm trying to cobble together something for a small diesel heater to be used in a canal boat heating a hot tank and/or radiators. The boat runs on 12 volt and 12v motorised valves are impossible to come by so I'm going to use a small 12v to 240v mains inverter to drive the valve.
As most valves are 5w I'd rather not have the inverter running and supplying 5w all the time the valve is open. So my idea was to fix the wiring so that when the valve needs opening or closing the inverter is switched on, the appropriate wire made live in the usual manner and then the inverter is switch off again once the valve has changed position.
(The rest of the control logic I can do all in 12v)
I'm trying to cobble together something for a small diesel heater to be used in a canal boat heating a hot tank and/or radiators. The boat runs on 12 volt and 12v motorised valves are impossible to come by so I'm going to use a small 12v to 240v mains inverter to drive the valve.
As most valves are 5w I'd rather not have the inverter running and supplying 5w all the time the valve is open. So my idea was to fix the wiring so that when the valve needs opening or closing the inverter is switched on, the appropriate wire made live in the usual manner and then the inverter is switch off again once the valve has changed position.
(The rest of the control logic I can do all in 12v)