High-lift self-priming pump flow head measurement method

How to measure the flow head of a high-lift self-priming pump? How to measure the head lift of a high-lift self-priming pump? High-lift self-priming pump flow head measurement method First determine the specific model of high-lift self-priming pump, using what series of high-lift self-priming pump selection, you can press the actual conditions required for the maximum flow rate of flow, lift if Not sure, according to the vertical height of the delivery plus elbow and horizontal distance, pipe loss can calculate the required lift, enlarge 5% - 10% margin value for the required lift, the two main performance parameters in the type Determine the specific model number on the spectrogram or series of characteristic curves. Use the pump characteristic curve to find the desired flow value on the abscissa and the desired lift value on the ordinate. Draw the vertical or horizontal lines from the two values, respectively, and the intersection of the two lines falls exactly on the characteristic curve. The pump is to be elected high-lift self-priming pump, but this ideal situation generally not rare, usually run into the following situations: The first: the intersection point in the characteristic curve above, indicating that the flow to meet the requirements, but the head Not enough, at this time, if the lift is about the same, or a difference of about 5%, can still be used, if a lot of head difference, then choose a larger head pump. Or try to reduce the pipeline resistance loss. The second: the intersection of the curve below the characteristic curve, in the fan characteristic trapezoidal trapezoidal range, initially set this model, and then according to head difference between how much to decide whether to cut the impeller diameter, if the head difference is small, do not cut, if According to the required Q and H, according to its ns and cutting formula, cut the impeller diameter, if the intersection does not fall within the range of fan-shaped trapezoid, should choose a pump with smaller head. The above is the high head self-priming pump flow head measurement method, in addition to high lift self-priming pump, and sometimes have to consider the production process requirements, the use of different shapes QH characteristic curve. Read more: China Building Water Exhibition Pump Valve Tube Fittings Exhibition Water Expo Xiamen Maritime Exhibition Internet + Forum Yiwu Expo Industry Interconnection (Xiamen) Technology Co., Ltd. Asia Pump Network Editor: He Duanhui (QQ / WeChat:) http://beng.liuti.cn/ (service hotline:)