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1) Commissioning instructions for differential pressure bypass: The main purpose of differential pressure bypass system debugging is to ensure that when the ends are all closed, the water flow through the bypass valve can meet the minimum flow required by the host, to ensure that the host will not have a flow alarm and cannot normal work. In addition to the selection of a pressure difference bypass valve of appropriate caliber, the setting value of the pressure difference bypass valve needs to be adjusted to meet the flow requirements of the host. If the selected differential pressure bypass valve diameter is too small or the set value is too large, it may cause insufficient flow through the host. During commissioning, it is simulated that all the hot and cold ends are closed, all the end valves are closed, and the pressure value is adjusted to ensure that the host will not have a flow alarm.
2) How to set the pressure value of differential pressure bypass according to the curve:
Assumption: The model for selecting the differential pressure bypass according to the cooling capacity is the DN25 angle type 0.5 ~ 3Bar differential pressure bypass; the minimum water flow required by the system is 2m3 / h (according to the equipment parameters of the host manufacturer), and the pump's external head It is 17.5M (1.75bar), then the intersection point A of the two parameters in the graph is drawn as follows, then the pressure value corresponding to the bypass of the differential pressure is set to 1.5Bar. 
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