求翻译：供回水总管间设电动压差旁通阀，在末端负荷变化时，根据压差调节旁通水量，来维持冷热源机组及水泵在定流量工况下的节能运行。水管系统布置为同程式。是什么意思？

Supply and return mains are located to the electric differential pressure bypass valve, in the end of the load changes, according to the pressure regulating bypass water to maintain the cold and heat source unit and the pump energy-saving operation in conditions of constant flow. The plumbing system

For water mains-powered pressure differential by-pass valve, in the end, when the load changes pressure differential regulation by-pass water, to heat units and maintaining the cold water pump in the energy flow conditions to be able to run. water pipe system to the program.

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For return line located electric differential pressure by-pass valve, at the end when the load changes, adjustable according to the differential pressure by-pass of water, to maintain and water pump constant flow of cold and heat source unit under the condition of energy-saving operation. Layout of

Supposes the electrically operated differential pressure by-pass valve for the return line between, when terminal load change, according to the differential pressure adjustment by-pass water volume, maintains the cold heat source unit and the water pump under steady flow quantity operating mode ener