I have a master valve but I need the zone valve to stay open for a set time after the master valve shuts off, how can I do this?
Background:
I have a master valve that is underground and a manifold for my various drip zones that is above ground. I am trying to auto drain the line between the master valve and the manifold.
Currently when a zone finishes the master valve and zone valves close at the same time. This causes the manifold to remain at full pressure and prevents the drain valve from activating.
I need a way for the zone valves to operate at a delay relative to the master valve.