This solenoid can be actuated down at 6VDC (although it was a little slower to open). Here is the current draw table for various voltages. We suggest a TIP120 or N-Channel power FET with a 1N4001 kickback diode to drive this from a microcontroller pin. For a power supply, a 9V 1A or 12V 1A power adapter will do the job.;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 (MCM Part# 28-17460). Features. 1/2 Nominal NPT. Working Pressure: 0.02 Mpa - 0.8 Mpa. Working Temperature: 1ﾃつ｡ﾃδ｣C - 75ﾃつ｡ﾃδ｣C. Response time (open): ﾃつ｡ﾃδ 0.15 sec. Response time (close): ﾃつ｡ﾃδ 0.3 sec.;Actuating voltage: 12VDC (but we found it would work down to 6V). Actuating life: ﾃつ｡ﾃδ 50 million cycles. Weight: 4.3 oz. Dimensions: 3 x 2.25 x 2. Voltage- Current. 6V- 160 mA. 7V- 190 mA. 8V- 220 mA. 9V- 240 mA. 10V- 270 mA. 11V- 300 mA. 12V- 320 mA. These solenoids are not rated for food safety or use with anything but water.