The constant volume systems may employ away or way valve. While pumping costs will decrease to
a small amount with away valve, other problems occur. The way valves with constant volume system may sometime lead to balancing problems in a large network and may lead to water scarcity at some terminal locations. The pumps must incorporate the minimum recalculating system should the way valves close to 100% close position. The systems incorporating away valve ensure continuous circulation. The type of away valve selected will determine its location in the system.
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