Motor driven metering pump has to be strong and  stable. Every series of NEWDOSE motor-driven dosing pumps offer a range of different models, with manual or automatic signal control (4-20mA), for viscous liquids, with different dosing systems, different parameters, different functions. Every model, in turn, is available with different flow rates and working pressures to meet every need. NEWDOSE motor-driven metering pumps offer few liters to 6000 l/h, with a working pressure that can reach up to 30 bar in the ND (high-pressure) models. 

Benefits of Motor Driven Metering Pumps

The performance range of motor-driven dosing pumps is very wide. They can provide extremely accurate measurements even under fluctuating pressure conditions. This can reduce chemical consumption and achieve precise process control.

These pumps always provide powerful low-cost power. They are also flexible: they can be controlled by stroke length and motor speed, so that they can be seamlessly integrated and/or modified in the automation process. Energy consumption depends on the power required, not the other way around. Finally, a specially designed metering profile can achieve the best metering results.


Working Principle of Electric Diaphragm Pump

The motor drives the helical gear reduction box connected with the main shaft to form a reduction mechanical structure, the bearing is on the eccentric shaft, the eccentric shaft rotates under the drive of the output shaft of the reduction box, the bearing performs eccentric motion on the eccentric circle of the eccentric shaft, the generated eccentric distance is converted into linear motion of the push rod, and the push rod drives the diaphragm to do linear reciprocating motion with the cooperation of the restoring force of the spring. A reciprocating cycle is called a stroke, the reciprocating distance is called the stroke length, and the number of reciprocating cycles per minute is called the stroke frequency.

When the push rod pulls the diaphragm to move backward, the volume between the diaphragm and the pump head increases to generate negative pressure, the one-way valve of the suction pipeline opens, and the medium in the inlet pipeline enters the cavity of the motor-driven dosing pump head. When the suction stroke ends, the diaphragm movement stops instantly, the pressure in the pump head is balanced with the pressure in the inlet pipe, and the one-way valve of the suction port is reset. During the discharge stroke, the diaphragm connected with the slide bar moves forward, and the pressure in the pump head immediately rises. When the pump head pressure is higher than the outlet pressure, the outlet check valve is opened, and the medium in the pump head enters the discharge line. When the discharge stroke ends, the diaphragm movement stops again, the pressure in the pump head is equal to the outlet pressure, and the outlet check valve resets, and then enters the next cycle, thus forming the transmission of liquid in the form of pulses. Rotate the stroke adjusting rod, which rotates to feed or move away from the box body, so that the distance traveled by the push rod is correspondingly reduced or increased, thereby adjusting the stroke size and finally achieve the purpose of changing the stroke adjusting flow rate.

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