How to deal with common faults of metering pumps?

1、 How to disassemble and replace the diaphragm of the metering pump

1. Remove the four screws that secure the stationary pump head. The screw position is on the opposite side of the metering pump.

2. After the pump head is loosened, adjust the stroke length to 0% before removing the pump head. It can ensure that the magnetic induction shaft has sufficient working pressure and maintain its connection firmly, so that the diaphragm can be unscrewed.

3. Pull the hydraulic end outward to release the screw from the socket. Grasp the liquid end and rotate it in the opposite direction. Slight frictional resistance can unscrew the diaphragm.

Once the diaphragm is removed, check the safety of the metering pump diaphragm to ensure that it is intact and undamaged without any damage. Install a new diaphragm and rotate the back plate and diaphragm clockwise until they are tightly attached. Adjust the backplate so that the liquid leakage outlet hole is located at the bottom of the pump.

5. After the installation of the diaphragm is completed and the backplate liquid leakage is discharged and placed in a vertical position, install the pump head. Ensure that the suction valve is aligned with the two ends of the liquid leakage discharge hole, and the hydraulic end screw is aligned with the two ends of the four opposite holes.

6. Rotate to the position where the stroke length is 100%. That can rotate the entire set of components until the backplate liquid leakage discharge hole is aligned with the bottom two ends of the pump. During the whole process of pump operation, adjust the hydraulic end and diaphragm to the appropriate position.

7. After the hydraulic end is connected to the backplate, tighten the four anchor bolts using the top angle method until they fit. Use force evenly during this work.

2、 How to remove the old diaphragm

Loosen the four pump head screws and move the hydraulic end. Rotate the stroke length to 0% and grasp the hydraulic end, then slide down from the screw hole, so that the screw does not touch them, but still controls the back plate and diaphragm. Then rotate this component in the opposite direction, with slight frictional resistance, the diaphragm will loosen from the magnetic induction shaft. If the diaphragm has not yet loosened, apply some lubricating grease on the contact surface between the diaphragm and the magnetic induction shaft. After being left for more than ten minutes, gently tap the diaphragm with a plastic hammer. Then proceed again according to the above description.

3、 When using the self suction method to measure and calibrate hydrogen peroxide, air pockets are caused within the system software. How to solve this problem?

The metering pump is installed with a self exhaust pipe pump head and uses a self filling suction type. Keep the suction pipeline as short as possible.

4、 After the installation and operation of the metering pump, do not measure the calibration solution?

Is a metabolic tube installed and the metabolic valve closed? The metabolic valve must be opened during the liquid introduction process of the metering pump. Note: Not all metering pumps may have metabolic valves.

2. There is a high possibility of vapor leakage at the suction end of the metering pump. The hydraulic end suction side connector is likely to lack an O-ring or the suction valve connection is loose.

3. The bottom valve of the metering pump is likely to be blocked, and the medicine used for metering calibration cannot be used.

4. The stroke length setting of the metering pump is not suitable.

5. The chemicals used for metrological verification are likely to crystallize at the hydraulic end, causing the valve ball and high-pressure gate valve of this product to malfunction.

5、 When a low viscosity substance has been calibrated using total flow monitoring, a common fault indication data signal of total flow has been received during the entire process of liquid introduction. How can this problem be addressed?

In terms of reaction speed, the delay time of a single pulse is likely not sufficiently long. Compared to the standard pulse width of 80msec, the pulse width of the total flow monitor can be excited by increasing the pulse width to 300msec. Stimulate the intelligent switching switch, remove the protective cover of the fixed circuit board, and remove the leakage wire X-1. That would stimulate the expansion effect, allowing a lot of time before common fault indications.

6、 How to prevent damage to the stroke precise positioning motor?

When adjusting the stroke position, ensure that the electric motor of the metering pump is running from start to finish. If the metering pump motor is not running, the stroke length adjustment rod needs to resist the support force of the pressure spring, which will cause the stroke precise positioning motor to be damaged too early.

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