What is the difference between the plunger pumps and the diaphragm metering pump

Metering pump is a common type of pump, can be used in a variety of environments, transportation of different media, the metering pump will have different types, the common type of pump type pump and diaphragm metering pump two types, each has the advantages of each place, the plunger pumps and the diaphragm metering pump has something different,

The principle of the plunger pumps and the diaphragm metering pump is different


The working principle of the plunger pumps: the motor drives the worm through a coupling and decelerates the spindle and eccentric wheel to make a rotary motion. The motor is reciprocated by the sliding adjustment seat of the eccentric connecting rod. When the plunger is moved back to the dead point, a vacuum is gradually formed in the pump cavity. The suction valve opens and inhales the liquid; when the plunger moves forward, the suction valve closes, the discharge valve opens, and the liquid is discharged when the plunger moves further. The reciprocating running of the pump also forms a continuous discharge of liquid with pressure and quantity.


The working principle of diaphragm metering pump: the plunger of the hydraulic end of diaphragm metering pump is driven by the reciprocating movement of the crank connecting rod mechanism at the transmission end. Plunger in the hydraulic chamber for reciprocating movement to promote the pressure of hydraulic oil pressure change, the hydraulic diaphragm deflection displacement to transport medium, hydraulic pressure in the hydraulic chamber is relatively stable, the function of the three valve to maintain.