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Precautions for selection of metering pump

  • Categories:Company News
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  • Time of issue:2020-11-09 15:26
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(Summary description)Metering pump is a kind of reciprocating pump, which can be divided into plunger pump and diaphragm pump in structure. When selecting metering pump, there are many things to pay attention to. Here is a brief introduction for everyone.

Precautions for selection of metering pump

(Summary description)Metering pump is a kind of reciprocating pump, which can be divided into plunger pump and diaphragm pump in structure. When selecting metering pump, there are many things to pay attention to. Here is a brief introduction for everyone.

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2020-11-09 15:26
  • Views:
Information

Metering pump is a kind of reciprocating pump, which can be divided into plunger pump and diaphragm pump in structure. When selecting metering pump, there are many things to pay attention to. Here is a brief introduction for everyone.

In order to ensure the metering accuracy of the metering pump, when the outlet pressure is not greater than the inlet pressure, a back pressure valve needs to be installed behind the metering pump outlet buffer tank, and the pump discharge pressure is not less than 0.3 MPa.

In addition, it is also necessary to install a safety valve on the outlet pipe of the metering pump. If the pump is self-provided, there is no need to set it separately. Generally, diaphragm metering pumps have a built-in and adjustable hydraulic safety valve. Plug metering pumps are usually not available, so it is necessary to install a safety valve on the pipeline.

Relevant Information

Comprehensive knowledge of water supply and drainage: the selection of pumps for sewage pumping stations should meet
Comprehensive knowledge of water supply and drainage: the selection of pumps for sewage pumping stations should meet
The pumps should be of the same type, and the number of pumps should not be less than 2, and not more than 8. When the water volume changes greatly, water pumps of different specifications can be configured, but not more than two types, or use variable frequency speed regulation device, or use blade adjustable water pump. The sewage pump room and the combined sewage pump room should be equipped with pumps. When the number of working pumps is not more than 4, the number of standby pumps should be one. When the number of working pumps is not less than 5, the number of standby pumps should be 2; when there are 2 standby pumps in the submersible pump room, one can be reserved on site and one is reserved in stock. The rainwater pump room may not be equipped with pumps. The rainwater pump room on the interchange road may be equipped with standby pumps depending on the importance of the pump room.
Causes of pump cavitation
Causes of pump cavitation
Causes of pump cavitation 1. Air leakage in the inlet pipe. 2. The liquid level is too low and air is inhaled. 3. The inlet pipeline design is unreasonable, and the highest point is higher than the impeller (only refers to the suction of water). 4. The installation method is unreasonable. In some places, the atmospheric pressure is low, and the cavitation margin of the selected pump itself is large, or the pipe diameter is too small, and the resistance is large. It can only be used to suck water when inverted. 5. The pressure of liquid vaporization increases. 6. The type selection is wrong, and the pump deviates seriously from the optimal working point. 7. Eliminate the damage of the air valve, the air is not exhausted or other reasons cause the pipeline and pump body to not exhaust the air.
Comprehensive knowledge of water supply and drainage: the selection of pumps for sewage pumping stations should meet
Comprehensive knowledge of water supply and drainage: the selection of pumps for sewage pumping stations should meet
The pumps should be of the same type, and the number of pumps should not be less than 2, and not more than 8. When the water volume changes greatly, water pumps of different specifications can be configured, but not more than two types, or use variable frequency speed regulation device, or use blade adjustable water pump. The sewage pump room and the combined sewage pump room should be equipped with pumps. When the number of working pumps is not more than 4, the number of standby pumps should be one. When the number of working pumps is not less than 5, the number of standby pumps should be 2; when there are 2 standby pumps in the submersible pump room, one can be reserved on site and one is reserved in stock. The rainwater pump room may not be equipped with pumps. The rainwater pump room on the interchange road may be equipped with standby pumps depending on the importance of the pump room.
Causes of pump cavitation
Causes of pump cavitation
Causes of pump cavitation 1. Air leakage in the inlet pipe. 2. The liquid level is too low and air is inhaled. 3. The inlet pipeline design is unreasonable, and the highest point is higher than the impeller (only refers to the suction of water). 4. The installation method is unreasonable. In some places, the atmospheric pressure is low, and the cavitation margin of the selected pump itself is large, or the pipe diameter is too small, and the resistance is large. It can only be used to suck water when inverted. 5. The pressure of liquid vaporization increases. 6. The type selection is wrong, and the pump deviates seriously from the optimal working point. 7. Eliminate the damage of the air valve, the air is not exhausted or other reasons cause the pipeline and pump body to not exhaust the air.

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Time of issue:2020-11-06 13:43:33

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