As it is normally closed assembly, it opens the flow of liquid as soon as power ON and stops/blocks the flow when the supply voltage removed. The valve works with solenoid coil which operates electronically with DC 12 volt supply. When 12Vdc is applied to the two terminals, the valve opens and water can push through. These solenoids are not rated for food safety or use with anything but water.12V DC 1/2Inch Electric N/C Solenoid Valve For Water Tool Airġ2V 1/2 inch Electric Water Solenoid Valve - Normally Closed controls the flow of fluid+air and act as a valve between high-pressure water or any fluid! This liquid valve would make a great addition to your robotic gardening project. If you want a beefier water valve, we also carry a brass version which does not have a minimum pressure requirement and can be used with liquid flow in either direction.
For a power supply, our 9V 1A or 12V 1A power adapters will do the job. We suggest a TIP120 or N-Channel power FET with a 1N4001 kickback diode to drive this from a microcontroller pin. Here is the current draw table for various voltages. We tried this solenoid at various DC voltages and found we could actuate it down at 6VDC (although it was a little slower to open). Also, liquid can only flow one direction. The valve has a gasket arrangement inside, so there is a minimum pressure requirement of 0.02 Mpa (3 PSI). When 12VDC is applied to the two terminals, the valve opens and water can push through. There are two 1/2" (Nominal non-taped National Pipe) outlets. Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening project.
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