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technical article
Learn about plastic tube float flowmeters
2011-12-29 10:16:49

I. Overview

锥管等主部件均由AS、ABS塑料制成,有较好的耐腐性能,产品还具有结构合理、体积小、重量轻、锥管不易破碎等特点,塑料管转子流量计可广泛应用 Plastic pipe rotor flowmeter cone and other main components are made of AS, ABS plastic, have good corrosion resistance, the product also has reasonable structure, small size, light weight, cone tube is not easy to break, etc. Can be widely used

In chemical, environmental protection, food and other industrial sectors.


Principles and Structure


的主要测量元件为一根小端向下,大端向上垂直安装的锥形塑料管及其在内可以上下移动的浮子。 The main measuring element of the plastic tube rotor flowmeter is a conical plastic tube with a small end facing downward and a large end facing upward, and a float that can move up and down inside. When the fluid flows through the conical plastic tube from bottom to top, a pressure difference is created between the upper and lower parts of the float.

The float rises under this differential pressure. When the force that causes the float to rise is equal to the combined forces of gravity, buoyancy, and viscous force, the float is in an equilibrium position. Therefore, the fluid flow through the flowmeter and the height of the float, that is, the flow with the flowmeter

There is a certain proportional relationship between the areas, and the position height of the float can be used as a flow measurement.

3. Installation [1] Before installation, the foam support in the instrument should be gently taken out with tool nose pliers, and then reinstalled. When installing, pay attention to whether the rubber gasket is installed in the groove of the pipe. To prevent water leakage.


[2] The interface of the flowmeter can be matched with ABS plastic pipe, or PVC plastic pipe, and connected with special glue, or it can be connected by plastic method, and then connected to the metal flange.


[3] The flowmeter must be installed vertically, without obvious tilt, and its installation height should be convenient for reading the float. When reading, the line of sight and the float should be horizontal. [General standard: The optimal flow rate required is 50% -70% of the maximum flow rate of the flow meter. Try not to use the highest number. A

[4] At the upstream and downstream of the meter, the inlet and outlet of the meter should ensure a straight pipe section with 5 times the meter diameter.


[5] The pressure of the bedding fluid must be stable. If the fluid is too unstable, it will cause the float to fluctuate and cannot be measured correctly. A buffer or a setter should be set upstream of the flowmeter.


应垂直安装,流量计中心线与铅垂线的夹角不应超过5度。 [6] The plastic tube rotor flowmeter should be installed vertically, and the angle between the centerline of the flowmeter and the plumb line should not exceed 5 degrees.

Fourth, use


[1] When using the meter, first slowly open the upstream valve to full open, and then use the regulating valve downstream of the flow meter to adjust the flow. When the meter is out of use, close the upstream valve slowly, and then close the flow regulating valve downstream of the meter.


[2] The indication value of the meter is seen in the middle of the score line, and the indication value is read from the scale of the float according to the height of the float.


〔3〕 When the cone and float are contaminated, they should be cleaned in time.


[4] Regularly check the flowmeter for errors. Once it exceeds the specified error, the float and cone should be replaced or recalibrated to obtain better accuracy.


[5] When the measured fluid is inconsistent with the calibration medium of the flowmeter, the displayed value must be corrected.