Orbit brand parts (especially valves)?

Does zone 2's valve affect the flow rate at all? Or is it always
the same dribble, regardless of bleeder valve/control setting?

These valves can sometimes exhibit odd behaviour. Unscrew the
solenoids and make sure that the orifices aren't scarred up.
In certain vintages of valve, the orifice can "slip" out of
optimum alignment with the solenoid, and exhibit a variety
of behaviours:

- won't turn off
- bleeder does nothing
- bleeder arm jammed and cannot be moved
- won't turn on at all.

Try activating the solenoids after they're unscrewed and see if
it actually moves.

I've also had a defective bleeder arm on a new valve that broke
at a touch.

Orbit's saving grace is that they're _very_ generous with
free repair parts.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.