Ran into one of these at a fairly new house (4 years old) the other day: http://www.fimcomfg.com/
1 line (the 'mainline') into the valve, 8, count em, 8, lines coming out the bottom of the valve then I guess running all over the yard for the 8 zones. The valve was maybe 10" in diameter so there had to be quite a mess of pipe down in the ground leaving the valve. From the controller you could only tell it to turn on and off, there was no selecting which zone to turn on; it only turns on the next zone in line. Limit of 8 zones per device (and per controller), so since the yard had 11 zones there were 2 controllers and 2 of these devices. To run zone 4 if zone 5 had just ran, you had to cycle all the way thru all the zones to get back to zone 4.
Sure hope I never have to repair a leak in all that mess.....
George
1 line (the 'mainline') into the valve, 8, count em, 8, lines coming out the bottom of the valve then I guess running all over the yard for the 8 zones. The valve was maybe 10" in diameter so there had to be quite a mess of pipe down in the ground leaving the valve. From the controller you could only tell it to turn on and off, there was no selecting which zone to turn on; it only turns on the next zone in line. Limit of 8 zones per device (and per controller), so since the yard had 11 zones there were 2 controllers and 2 of these devices. To run zone 4 if zone 5 had just ran, you had to cycle all the way thru all the zones to get back to zone 4.
Sure hope I never have to repair a leak in all that mess.....
George