The 2 wire reverse polarity model is a perfect example of this. The valve can be energized to open, and left hooked up, with no energy used once fully opened. To close, simply reverse the polarity of the wiring. This can be done manually or by using a DPDT switch, as seen in the wiring diagram.
The stainless steel ball valve is NSF certified, which means you can install it in the drinking water pipeline.
Specifications
U.S. Solid Model: USS-MSV00006
Valve Material : SS304
Ball Seal: PTFE
Operating Time : 6-8 Seconds
Working Voltage : 9-24V DC
Max Power : 5 W
Max Torque : 6 N m
Max Medium Pressure : 1.0 Mpa
Temperature Range for Flow Medium : 0°C to 90°C
Ambient Temperature Range : -20°C to 45°C
Enclosure Rating : IP65
Life Expectancy : 80,000 to 100,000 Cycles
Bore Type : Full
Thread Type : NPT
Wiring Type : 2 Wire Reverse Polarity Video