Solenoid Dosing Pump

HAOSH electromagnetic driven metering pumps are available in flow rates from 0.4 to 80 L/H and back pressures from 16 to 1.5 bar. To be able to meter almost any liquid chemical, HAOSH uses a very wide range of materials to help customers’ various applications run smoothly.

The solenoid pump has almost no wear on the drive because there is only one moving part. The pump does not require lubricated bearings or shafts, so maintenance and repair costs are very low. The continuous operation characteristics are very good.

how does a solenoid pump work?

Solenoid driven dosing pumps have two main components, the actuator and the hydraulic end. The actuator uses an electronic pulse unit (EPU) to energize the solenoid coil. The solenoid then moves the solenoid shaft forward and backward by opening and closing. This stroke motion is transferred to the diaphragm in the metering head. Two check valves prevent the feed chemical from flowing back during pumping. The stroke length and stroke rate can be adjusted precisely to vary the dosing rate of the HAOSH solenoid-driven metering pump.

Industry applications

Solenoid dosing pumps are particularly suitable for applications that convey small flows of low pressure line liquids.

  • Drinking water treatment: disinfectants
  • Wastewater treatment: flocculants
  • Cooling water: corrosion inhibitors and biocides
  • Paper industry: additives



Solenoid metering pumps use a diaphragm and solenoid assembly to discharge fluid into the discharge line.

The solenoid “actuator” consists of a solenoid and spring assembly that can be activated/deactivated by a series of electrical pulses. When the solenoid is activated, the solenoid pushes against the diaphragm, discharging fluid. When the solenoid is deactivated, the spring mechanism causes the diaphragm to return, allowing more fluid to enter the chamber from the suction line in preparation for delivery.

Solenoid dosing pump by the electromagnetic body as the main driving force, the flow and pressure is smaller. Mechanical diaphragm pumps are driven by mechanical motion as the deformation of the diaphragm to convey the liquid, with greater flow and pressure.

A solenoid is a three-dimensional coil that refers to multiple coils of wire, which can be hollow inside the coil or have a metal core. When an electric current is passed through the wire, a uniform magnetic field is generated inside the solenoid. Solenoids are very important components and can also be used as solenoids or inductors.

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