This is an example of how to use zone valves and Pumps for a heating system.
You will notice that in the Picture Below there are 8 zones with 4 Zone Valves the other zones appear to be always feed when the boiler is on. (All this is on a Secondary Loop) But, there could be a mixing station higher up that controls the flow and tempeature - but this is not show in this picture. You will also see that one zone is going to a PEX Manifold with 9 loops. There does not appear to be a mixing valve thus we can assume that this manifold get the water at boiler tempeature.
This is only an example. Actual layouts vary from job to job.
List of materials needed for a project like this (Click Link below to Purchase Product and see more Information)
Hydronic Heating Side (Trim)
Quantity 1 - Gas or Electric Heating Boilers
Quantity 4 - Zone Valves
Quantity 15 + - Ball Valves for Hydronic Heating Side
Quantity X - Boiler Drain and Hose Bibs
Quantity 3+ - Temperature Guages and Tees
Quantity 1 - Hydronic Heating Expansion Tanks
Qunatity 1 - Zone Valve Controllers
Qunatity 1 - Pump Relay
Quantity X - Hydronic Heating Thermostats and Floor Sensors
Quantity 1 - Taco Flo Checks Valves
Hydronic Heating Side (Distribution)
Quantity X - Hydronic Baseboards (Depends on System)
X = Various Amounts of Product needed - dependant on actual system