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As far as i can understand you, your problem it's not so dificult to be solved, you have the valve but you can not command it to release the pressure, i suppose this is an On/Off valve, probably with a coil, in this case you only need a relay controlled over RC using one of your channels, let me know more information if you need more help
Of you want to use a magnet, of course forget the Hall effect semiconductor, best, as appointed, is to use reed relays, looks a good idea to use a screw and a motor to remove the main fuse, place a second reed to make the motor put on place the fuse again