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Several notices in the application process of metering pump

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威尼斯官网:Several notices in the application process of metering pump

威尼斯官网: Release time:2018-03-10 author:KeYu Machinery click:

Do you know a few important matters that need to be paid attention to in the application of metering pump? Below the diaphragm metering pump manufacturer Ke Yu machinery for you to introduce

Metering pump

Attention should be paid to the following items when the drug processing system is run:

A. pressure point pressure

B. stroke frequency

C. suction lift height

D. altitude

The corrosivity of E. chemicals

When the outlet of the metering pump is atmospheric pressure, what is the way to improve the precision of the repeated metering of the pump?

The installation valve spring of the metering pump discharge valve can improve the accuracy of repeated metering, but the most effective way to improve it is to install a back pressure valve at the end of the pipeline.

How to adjust the back pressure valve?

1. never exceed the maximum working pressure of the metering pump.

2. when the pump has pressure at the suction end, the pressure of the discharge end of the pump is at least 1bar higher than the pressure at the suction end.

How to choose the appropriate volume of pulse dampers?

By multiplying the metering capacity (ML) of each stroke of the metering pump by 26, the minimum volume (ML) of the pulse dampers needed to reduce the 90% pulsation can be obtained.

How to set the pressure of the safety valve?

The pressure of the safety valve can be adjusted within the rated operating pressure range of the metering pump, and it is not allowed to exceed the maximum working pressure of the metering pump. The safety valve is designed to prevent the overvoltage operation of the metering pump. For example, if the maximum working pressure of the metering pump is 3bar, the pressure of the safety valve should be set to 3bar or lower, so as to ensure the normal operation of the metering pump. Overpressure is one of the main causes of the damage of the metering pump.

If the conveyed liquid is not water, how to calculate the height of the lift?

The rated suction height of the metering pump is divided by the proportion of the measured liquid.

Under what circumstances do you use a self filled suction fluid?

It can be used in the following case with self filling suction:

1. the liquid is easy to volatilize.

2. the specific gravity of the liquid is larger.

3. when higher stroke frequency is needed;

4. the large storage tank is needed in the field application, and it depends on the self imbibition of the metering pump.

Can you give some suggestions about the selection of the pump head? What are the usual problems in the corrosion of the pump head / seal, and how to avoid them?

In relation to the pump head of a metering pump, the common problem is when it occurs in the case of acid, chlorine, fluoride and hydrogen peroxide. Because of the difference of drug concentration and operating temperature, it is difficult to determine the material of the concrete pump head. When measuring fluorides, we recommend the use of Viton? Sealed PVC pump head. For most applications of chlorination, it is best to choose the EPDM sealed NP (organic glass) pump head. The PTFE sealed PTFE pump head or stainless steel pump head can only be used for the measurement of hydrogen peroxide mixture. The measurement of concentrated hydrochloric acid usually uses Viton? Sealed organic glass pump head. The measurement of concentrated sulfuric acid can select the PTFE seal PTFE pump head. The chemical manufacturer gives the relevant suggestions, or consult the ProMinent? Chemical Anticorrosion chart to determine the compatibility of the chemicals and the contact material.

What factors must be taken into consideration when measuring the liquid in the pump head?

The main considerations are the viscosity, specific gravity, steam pressure and temperature of the liquid.


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