What is a metering pump with electromagnetic drive?

A metering pump, also widely known as a dosing pump or chemical injection pump, belongs to the family of positive displacement piston pumps. The primary function of a metering pump is to accurately dose chemicals into a system. There are various types of metering pumps, including solenoid, piston, peristaltic, diaphragm, and hydraulic pumps. The ML & ML‑S metering pumps are solenoid‑driven pumps with microprocessor control.

How does it work?

In an electromagnetic metering pump, an electromagnetic drive moves the diaphragm in a reciprocating motion within the pump head, causing changes in volume and pressure inside the pump chamber. Pressure changes, driven by the opening and closing of suction and discharge valves, enable precise intake and discharge of liquid. A magnet moves the solenoid valve shaft back and forth, turning it on and off. This motion is transferred to the diaphragm in the metering head. Two check valves prevent backflow of chemicals during pumping. Additionally, stroke length and speed can be adjusted to modify the pump’s performance.

Key Advantages

Since there is only one moving part, the drive is virtually wear‑resistant. The pump does not require lubrication of bearings or shafts, resulting in very low maintenance and repair costs. It also offers excellent continuous operation performance.

Technical Specifications

Parameter	Value
Flow rate range	1–20 L/h
Pressure range	10–1 bar
Operating temperature (fluid)	–15 ℃ to 60 ℃
Viscosity range	0.3–1000 cps
Ambient temperature range	–10 ℃ to +45 ℃
Power consumption	28 W
Supply voltage	1Ph 240V 50Hz / 1Ph 110V 60Hz
Strokes per minute	80–180
Diaphragm diameter	60–84 mm
Protection rating	IP55
Control options	Manual (ML), Pulse/4–20 mA (MLS)
Diaphragm material	PTFE + EPDM rubber + SUS304 + Nylon fiber
Valve type	Ball check valves
Suction lift	Up to 2 m

Installation and Operation Guidelines

• Mounting: Can be installed vertically or horizontally using provided brackets.
• Tubing: Use compatible chemical-resistant tubing (supplied: suction 4 m, delivery 2 m).
• Priming: Ensure the pump is primed before initial operation to avoid dry running.
• Maintenance: Regularly inspect diaphragm and valves for wear; clean suction filter periodically.
• Safety: Install in a well-ventilated area away from direct sunlight and rain (unless outdoor-rated).

Optional Accessories