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Metering pump installation precautions

Edit:Huaian Machinery Co., Ltd.UpDate:2018-08-02

1. Exports are higher than imports to avoid siphoning

2. Pump head and needle valve require vertical device

3. The attached pipe fittings can be tightened by hand. Do not use anything; do not use raw tape at the thread.

4. The power supply voltage is stable and grounded

5. The installation environment is neat and wide, and the ventilation is good.

Analysis of common problems in metering pump measurement

1) The metering pump is not properly sucked

Rotate to the stroke length in hundred percent orientation. This allows the entire set of components to be rotated to the back plate leakage drain hole to align with the lower end of the pump. Adjust the hydraulic end and the barrier to the proper orientation during pump operation. Metering pump manufacturers wholesale

For the reaction moment, the pulse duration may not be long. With respect to the specification of a pulse width of 80 msec, the flow monitor pulse width extension can be activated, adding a pulse width to 300 msec. Activate the smart transfer switch, remove the cover of the fixed circuit board, and remove the jumper X-1. This activates the extension function and allows more moments before the fault indication.

The metering pump device is self-priming and aspirating from the exhaust pump head. Keep the aspiration line as short as possible.

2) Disconnecting the metering pump barrier

When it comes to removing the old barriers, it often takes trouble. Now give some additional advice on how to remove the old barrier.

1. After the pump head is loose, adjust the stroke length to 0% orientation before removing the pump head. It can ensure that the electromagnetic shaft has a satisfactory pressure and insists that its connection is stable, so that it can unscrew the barrier.

2. Pull the hydraulic end outward to disengage the screw from the socket. Catch the liquid end to rotate counterclockwise. With a little resistance, you can unscrew the barrier.

3. The metered chemical may crystallize at the hydraulic end, causing the check valve ball and seat to operate normally.

4. There may be a gas leak at the suction end of the metering pump. The hydraulic end suction side adapter may have a short O-ring or suction valve connection loose.

3) Use the flow supervision to measure a high-viscosity medium, and receive a flow fault indication signal during the liquid introduction process. How can I deal with this problem?

After releasing the 4 pump head screws, move the hydraulic end. Rotating the stroke length to 0% and catching the hydraulic end, then sliding out of the screw hole, then the screw does not touch them, but also manipulate the back plate and the barrier. Then rotate the part counterclockwise with a little resistance and the barrier will loosen from the electromagnetic shaft. If the barrier is not loose, use some lubricant on the touch surface of the barrier and the electromagnetic shaft. After a few minutes, use a plastic hammer to quietly tap the barrier. Then proceed again according to the above description.

4) How to avoid the metering pump stroke positioning motor burning?

1. Remove the 4 screws that secure the pump head. The screw orientation is on the opposite side of the metering pump.

2. See if the secretion tube is installed and the secretion valve is closed? The secretion valve needs to be opened during the introduction of the metering pump. Note: Not all metering pumps have a secretion valve.

3. Install the pump head after the end of the barrier and the back drain of the backing plate is placed in a straight orientation. Make sure that the suction valve is aligned with the leaking discharge hole, and the screw at the hydraulic end is aligned with the corresponding four holes.

5) Is the flow of the hydraulic metering pump small or inaccurate?

1. Unscrew the bleed valve in the three valves.

2. Fill the oil through the oil filling valve.

Selection of metering pumps

First, determine the pressure: the additional pressure of the selected metering pump is slightly higher than the required higher pressure, generally 10 to 20% higher. Don't pick too much, too much pressure will ruin the power, add equipment and running costs.

2. Determine the flow rate: The selected metering pump flow rate should be equal to or slightly larger than the required flow rate of the process. The application scale of the metering pump flow rate is preferably 30 to 100% of the additional flow rate of the metering pump, and the repeating reproduction accuracy of the metering pump is high at the moment. Considering the economical and practical, it is recommended that the actual demand flow of the metering pump be selected as 70 to 90% of the additional flow of the metering pump.

3. Determine the pump head (hydraulic end) raw material: After the specific model of the metering pump is determined, the raw material of the over-current part is selected according to the characteristics of the overflow medium. This step is very important. If the selection is not correct, the medium will be corroded. Damage to overcurrent components or media leaks, pollution systems, etc. In serious cases, a major accident may also occur.

Other aspects: When selecting a metering pump, it is also necessary to consider the accuracy level of the metering pump required. The higher the accuracy level, the higher the investment. The metering pump generally operates at a temperature of -30 to 100 ° C. The metering pump has a wider operating temperature range (for example, a high temperature liquid metering pump with a thermal jacket, the delivery temperature can reach 500 ° C). Regarding the particle size of the medium, the requirement should be less than 0.1 mm. For the medium larger than 0.1 mm, the overcurrent structure of the pump can be modified to meet the demand. The viscosity of the medium should generally be 0-1000mm/s, the special metering pump can reach 6000 mm2/s, and the flow rate of the mechanical barrier metering pump is the larger flow measured under the calibrated extra pressure (water at room temperature) When transporting, if the pressure drops, the output flow will be higher than the calibration.