Hi - I am hoping someone before me has tried this ! I am looking to build a valve assemble to drain a water tank at certain intervals. I have searched the web and can't find anything at a reasonable price so I am looking to integrate a 100:1 geared DC motor such as this one:
with a ball valve such as:
The DC motor has an encoder so I should be able to work out how many turns and in which direction is required to close or open the valve.
I don't know how your set-up is but i did these kind of things with solenoids, with a big tank (350 liters ) and a solenoid
two meters below the tank. It still works perfect so i don't know your set-up but in mine it was possible
My local big box hardware store has 24V solenoid controlled sprinkler valves designed to be run by a fancy sprinkler timer unit. Not sure if such a value could deal with the pressure you are interested in though.
cool - mine is going to be mounted at the end of a section of storm water pipe. To cut a long story short, our rainwater flows into two large 23000 l tanks but the stormwater pipe always has water remaining in it to the level of the tanks due to gravity ie. its what is known as a wet system. Unless the water is drained regularly the water goes rancid and then as soon as the first rain comes it washes all of this into the tanks making our water go bad. I want to fit a valve to the lowest point in the system and drain the pipes regularly and also have a rain sensor that will close the valve when it starts raining.
There are solenoid valves that will work with very low pressure, but the ones I use have very small (3/8") orifices. Since you want to drain your system dry, I wonder if you could use a flapper valve for a toilet tank; all that needs is a short pull; then draining and closing are automatic. Probably very succeptible to trash in the water, though.