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Reasons and Solutions for Internal Noise of Metering Pumps


As a professional metering pump manufacturer, I often hear feedback from users that the metering pump will make a buzzing noise when it is installed and used for about 2 years. The most normal thing, just like the computer, we will also experience sluggishness after using it for a period of time. Generally, such noise is mostly caused by the need to replace parts or the collision of internal components, mainly in the following aspects.

1. Fault 1: The impact sound inside the check valve at the inlet and outlet of the metering pump. Solution: No matter it is a diaphragm metering pump or a plunger metering pump, there will be a normal impact sound between the valve ball and the valve seat. The larger the one-way valve, the louder the sound, so this kind of noise belongs to the normal scene and does not need to be ignored.

2. Fault 2: The noise generated by the operation of the pressure relief valve inside the metering pump. Solution: The staff only needs to check whether the outlet pressure of the metering pump is abnormal. If the pressure is abnormal, it will inevitably cause the release valve to work and produce noise.

3. Fault 3: The release valve of the internal pressure lubrication system of the metering pump is working. Solution: This is the sound of the normal pressure release of the metering pump, we only need to confirm whether the grade of the lubricating oil is correct.

4. Fault 4: The worm gear/worm of the metering pump has an impact between the conversion of the suction and discharge strokes. Solution: Check whether a buffer is installed in the outlet pipeline of the metering pump, and whether the inflation pressure of the buffer is correct.

5. Fault 5: There is an impact between the suction and discharge stroke conversion of the metering pump, resulting in the impact between the couplings. Solution: First, check whether the motor turns correctly, and then check whether the buffer is installed in the outlet pipeline, and whether the inflation pressure of the buffer is correct.