I've included more information on my setup.

I'm no expert but am dealing w/ drip systems myself. If you are planting different items in each raised bed, you may want different watering needs. You could in that sense, make each one a zone by having in-line valves to shut off those you don't want to water, or turn a dial and reduce the amount going to the lower beds. Hope that helps. Check out all the fittings, you'll come up w/ something

LH,
GDl has a very workable idea, but here is my $0.02. Water from drip will never be evenly distributed unless your drip line is down hill at a 1 percent grade. That is a one foot drop for every one hundred feet. This allows the difference of elevation drop to compensate for the loss in hydraulic head. It is not an exact science because of many factors, the difference in water amount along a level lateral is not that noticeable. Not enough to cause a difference in the plants needs anyway. That was why they came up with a pressure compensated drip line to take care of this notion. But of course this solution only provided a more expensive drip line which was more apt to clog or blow out under excessive pressure. Trial and error is the best method. Any system set up that is not keeping some plants healthy can be modified easily. Just keep your eye on what is happening to your plants and checking the wetting pattern of your system. If you can tell me the slope with vertical drop height over distance, I can give you more definitive advice. JMHO Aloha