Reply To: OpenSprinkler Pi + Hunter PGV-101, power does not switch off

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24VAC power supply (24 VDC | 1.5 A | 36Watt | Mean Well HDR-30-24)

But the Mean Well HDR-30-24 is a 24V DC power supply (AC/DC)! You cannot use this and will damage OSPi and the solenoid valves if used for a long time! Use a 24VAC power supply (AC/AC), i.e. 230V input voltage AC, 24V output voltage AC
Solenoid valve technology is based on this voltage.