I have an Orbit 9 Station Sprinkler System & the manual watering feature isn't working. I replaced the 2 AA batteries & the fuse in the control box but it still won't come on. Can you help me?

Here is the location of Orbits Product Manuals
https://www.orbitonline.com/help_center?stPage=guideListPage-1

Hope this helps

I want to buy the orbital flush valve assembly ,please see the piture.

Question is not clear.
Do you have programming problem with the timer?
Or problem locating sprinkler heads?
Or a sprinkler valve problem?
Add a comment with detailed information.

Sprinkler timer turns ON-and-OFF.
Timer does not advance the sprinkler to next station. The sprinkler valve advances to next station when timer turns OFF.
For example, when timer turns ON, then station 1 starts watering.
Timer turns off, and then sprinkler valve automatically advances to station 2.
Timer turns on again, and station 2 starts watering.

Orbit resources:
http://www.orbitonline.com/support/
http://www.orbitonline.com/lib/media/InstallationGuide.pdf
http://www.irrigationdirect.com/media/manuals/owners-manuals/orbit/Orbit-WaterMaster-57880-Controller-Owners-Manual.pdf

i keep blowing fusa out of orbit time box

Perhaps it means there is a valve that you have to twist at each station?

Manual:
http://www.orbitonline.com/lib/media/57114-14%20rF_Eng.pdf
Website:
http://www.orbitonline.com/products/Timers/02/01/19/671/
Tech service 1-800-488-6156
Timer has 4 year warranty

The manual has troubleshooting

Looking through the manual I can see potential trouble areas:
-Water pressure too high > 60 psi is ordinary household pressure > order Brady BTG pressure gauge that connects to hose
-Overlapping times are 'stacked' by timer ... but 'more than one start time' is listed as cause of stations turning on when not supposed to >> reset and re-program timer, make chart of on-off times
-Weak or missing AA batteries >> clean terminal inside timer and replace batteries
-Hard water deposits or unfiltered water clogging water valve (water softeners frequently have this problem) >>> see if vinegar or CLR cleaner can help flush water valve >>> add sediment filter in front of timer
-Look at screen > does display show Manual? As in manual mode
-Fuse blown
-Bad solenoid
-A combination of problems listed above with sediment -or- solenoid as main suspects

moved into house with 4 station Orbit sprinkler unit. Manual is faded, cannot figure out how to get it to control the sprinkler system. Can I get online instructions on how to program it?

http://orbitonline.com/support/guides/Manualsearch3.cfm?Brand=02&Type=Timers

There are 3 things this "off power" "light bulb" could be. Blinking red light? means fuse has gone out. Check the power source where the unit is plugged in to. Is the GFI popped out? plug something else like a fan or something into the socket to test. the third thing is a short internally. Call orbit technical assistance. they're great.

Have you programmed the new one with all the info for date and time? Did you set the zones for the days you want and watering times?

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c