There are two ways to bleed a zone valve for manual operation:
One way is to simply turn the solenoid (the black cylinder with 2 wires) counter-clockwise a 1/4 to 1/2 turn. To shut off the valve, twist the solenoid clockwise until it is snug on the valve.
The other way is to use the bleed screw the same way, loosen the screw enough to release air (1/4 to 1/2 turn). Hand tighten the screw to shut the valve off.
NOTE: When using this method, you will see some water trickling from the bleed screw and this is normal.
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