The metering pump can be divided into two types: plunger pump metering pump and diaphragm metering pump according to the part of pump impeller

The plunger pump type metering pump is a kind of liquid ground suction and drainage by the plunger pump when it is operated repeatedly in parallel line, and the diaphragm metering pump relies on the plunger pump to move repeatedly in the cylinder body, which causes the single pulse impulse caused by the hydraulic oil in the cavity, promotes the diaphragm to and fro incite, and achieves the liquid suction and drainage under the effect of the valve opening and closing work. Because the diaphragm separates the plunger pump from the transported liquid, It can avoid environmental pollution and damage caused by liquid leakage. If the alarm system is added, parking alarm can be immediately conducted after diaphragm is cracked, and the fuel can be reasonably prevented from environmental pollution of step pipeline. After diaphragm is removed and replaced, it can be restored to operation. In addition, diaphragm pump also has the ability to add three valve equipment (full automatic oil pump, valve and exhaust valve), It can fill the oil in the hydraulic cavity immediately, in addition, it can prevent excessive oil supplement, improve the diaphragm service life, and ensure the safety of the software of metering pump system. According to the transmission system, it can be divided into camshaft type and n-tooth inlay type:

In which JW is a plate camshaft type structure, which is driven by the motor according to the worm gear and worm of the vortex bar, and the plunger pump is operated in parallel line reciprocating through the guide slide block (crosshead). The total flow adjustment of the pump is completed according to the change of the length of the plunger pump stroke or the pump speed. The stroke arrangement of the plunger pump can be adjusted without any pole within the range of 0-100%, and can be carried out during operation and parking.

After the motor control and other equipment are added, the original distance can be operated or mechanical automation can be completed. In addition to the communication AC soft starter or electromagnetic speed regulating motor, the double adjustment or reduction of pump speed can be completed to integrate into the production process.