Posted: 28/08/2014 at 23:11
I'm not entirely sure I fully understand what you mean David but if you are thinking about 2 separate, permanently installed systems that you can operate at different times - then you should be able to do that.
At the 'tap' end of the supply hose you have a valve which stops the risk of water from the irrigation system being drawn back into the mains water supply. I think it also helps to regulate the mains water flow so it doesn't 'blow' your irrigation system.
You would normally attach this valve to your outdoor tap but I can't see why you couldn't have 2 valves - one each on the 'tap' end of each irrigation system - and then use a regular hosepipe to attach to the valve to 'transport' the water to the system when you want to use the system (its just a regular hozelok type connection). You can swap the hosepipe between systems as required.
The advantage of this is that you can have the irrigation systems set up some distance from the tap and you're using regular hose to bring the water to each system instead of relying on long lengths of permanently installed 13mm supply hose running from tap to system.
One thing I would advise is that you find a way to keep the regulating valves off the ground & cover them when not in use. Any muck in the system will soon block it.