Metering pump is also called dosing pump or proportioning pump. It is a kind of special volume pump that can meet all kinds of strict technological process requirements. The flow can be step-less adjusted in the range of 0-100%. It is a special positive displacement pump used to transport liquid (especially corrosive liquid) and has been widely used in the seawater desalination industry. There are many classification methods for the desalination metering pumps.


1. According to the flow part of the desalination metering pump

(1) plunger and piston type (2) mechanical diaphragm type (3) hydraulic diaphragm type

2. According to the driving method

(1) motor (2)electromagnetic

3. According to work style

(1)reciprocating (2)rotary (3) gear

4. According to the characteristics of the desalination metering pump

(1)Extra-large base (2)Large base (3)Medium base (4)Small base (5)Microcomputer base


Other classification methods: electric control type, air control type, heat preservation type, heating type, high viscosity type, etc.


Structure of the Desalination Metering Pump


The pump consists of three parts: motor, transmission box and cylinder.


The transmission box component is composed of a worm gear mechanism, a stroke adjustment mechanism and a crank connecting rod mechanism. The high adjustment stroke is implemented by rotating the adjustment hand wheel, thereby changing the eccentricity of the moving shaft to achieve the purpose of changing the plunger (piston) stroke.


Cylinder body parts are composed of pump head, suction valve group, discharge valve group, plunger and packing seal.


Working Principle of the Desalination Metering Pump


The motor drives the worm through the coupling and decelerates the main shaft and the eccentric wheel through the worm gear to rotate. The eccentric wheel drives the reciprocating motion in the sliding adjusting seat of the bow-shaped connecting rod. When the plunger moves to the rear dead center, a vacuum is gradually formed in the pump chamber. Once the suction valve opens, liquid will be sucked in. When the plunger moves to the forward dead center, the suction valve closes and the discharge valve opens, and the liquid moves further toward Exhausted during exercise. In the reciprocating and smooth operation of the pump, a continuous pressure and quantitative discharge liquid is formed.

Solenoid Metering Pumps

Related NEWDOSE Dosing Pumps

  • DP Type Solenoid Dosing Pump
    Manual stroke frequency adjustment, adjustment by Up and Down keysRemote automatic control mode: Pulse signalProportional dosing is adjusted by external impulse signal and optional modes are frequenc...
    View More
    DP Type Solenoid Dosing Pump
    Pulse Signal
  • NDJ Motor Dosing Pump
    Functional CharacteristicsEccentric shaft is supported by bearings in front and rear and the cantilever shaft structure of the most of manufacturers on the market is abandoned; the speed reducing moto...
    View More
    NDJ Motor Dosing Pump
    40-150 L/h 10-3 Bar
  • ND1000 Motor Dosing Pump
    Functional Characteristics:Mechanically-driven diaphragm assembly is of simple operation and easy maintenance, and the pump head is free of leakage.The operation is smooth and steady, and the noise is low...
    View More
    ND1000 Motor Dosing Pump
    660-1200 L/h 5-3 Bar
  • NDWS Motor Dosing Pump
    Functional Characteristics:It is equipped with low pressure die-casting aluminum box with high strength, which ensures solidness and firmness, reduces the mass of the dosing pump and the weight of the ove...
    View More
    NDWS Motor Dosing Pump
    8-386 L/h 16-3 Bar

Tell Us Your Needs for Dosing Pumps,NEWDOSE team Get Back to You ASAP!