The steel tape is composed of eight parts: shell, ruler, brake, ruler hook, carrying strap, ruler spring, anti-drop protective cover and labeling.
Used for advertising and promotion purposes, it is divided into steel tape (steel tape) and leather tape (PVC plastic fiber tape), usually cute and small. Tape measures are also called measuring tools. Eighty-five percent of the world's tape measures are exported from China.
Abs Measuring Tape,Plastic Tape Measures,Metal Tape Measure,Plastic Retractable Tape Measure Shangqiu Yusheng Tools co.,Ltd. , https://www.cnystools.com
Pump characteristic curve
Pump characteristic curve Each pump performance parameters, flow Q, head H, efficiency η, shaft power P and NPSH NPSH can be used to test the resulting graph that the pump characteristic curve comprehensive, comprehensive and intuitive To the performance of the pump, there are many uses. Users can select the required pump according to the characteristic curve, determine the installation height of the pump, and grasp the operation of the pump. After the pump is manufactured, the manufacturer makes the characteristic curve through experiments and analyzes the influence of the geometric parameters of the pump on the performance of the pump according to the change of the shape of the characteristic curve so as to design and manufacture the pump with the required performance. The characteristic curve generally shows the flow rate Q on the horizontal axis, the vertical axis H, the efficiency η and the shaft power P, and the NPSH. The example is shown above.