In micro water pumps and micro self-priming pumps, the term "open flow rate" or "open flow rate" is often mentioned. Generally refers to water pumps, liquid pumps, especially micro water pumps. Micro liquid pumps have no pressure at the outlet (i.e. no valve), nozzles, thinner pipes, etc

The maximum flow rate that the pump can supply when there is no need for the pump to output the corresponding pressure to overcome the resistance of the class load, that is, when it is "open" or "open".

Once there is an added load, the flow rate of the pump will decay and cannot reach the maximum flow rate. However, the corresponding output pressure of the pump will also increase, and then meet the needs of spray, pressurization, car washing, water circulation, water transfer, improvement, scouring and other purposes. Widely used in laboratories and other fields. A typical water pump has a flow rate and pressure curve (also known as a flow head curve or Q-H curve). The two have a similar but inversely proportional relationship.

For example, the nominal "open flow rate" of a micro water pump is 12L/min, with a maximum output pressure of 2.4 kilograms. The meaning is: When there is no pressure at the pump outlet, the flow rate can reach its maximum; 12 liters per minute (such as when unloaded), rather than representing it at maximum output

When the pressure is 2.4 kilograms, the flow rate can still reach up to 12 LPM.

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