Testing a solenoid valve to see if it would work and if the pressure drop still allows an irrigation zone to run. I used a regular 9V battery to trigger it to avoid running long wires for a test. by instagram | Jun 9, 2022 | Photo PostsTesting a solenoid valve to see if it would work and if the pressure drop still allows an irrigation zone to run. I used a regular 9V battery to trigger it to avoid running long wires for a test.It worked!