LK Series Mechanically Actuated and Motor-Driven Metering Pumps Provide Flow Rates up to 856 GPH and Pressures to 145PSI

Ideal for Large Chemical Feed Applications

LK Series Metering Pump
The Iwaki LK Series metering pumps are motor-driven, mechanically-actuated diaphragm metering pumps. This larger LK Series can achieve outputs up to 856 GPH (3240 l/h) and maximum pressures of 220 PSI (1.5 MPa). The LK Series is ideal for chemical feed applications in a wide range of fields, including water treatment, chemical process, agriculture, mining and paper.

With market proven results and years of experience, Iwaki has employed state-of-the-art pump technology in the development of the LK Series metering pumps. A robust design transfers rotational force from the motor to the diaphragm via a compact drive unit. The pump drive unit is a worm gear and dual-cam drive gear box design. The advantage of this economical design is reliability, quality, performance, and ease of operation.

Various Materials and Types

The LK Series offers a variety of sizes to fit a range of small to very large injection flow rates. Several material configurations and flexible motor options combine to satisfy a multitude of applications.

High Performance and Versatile Design

The LK series has a discharge accuracy (repeatability) that is within ±2% FS. Reliability has been enhanced with the improvement in the linearity of the stroke and the discharge ratio of each stroke.

Liquid End

A diaphragm is attached to the gear reduction unit being driven by an attached motor. Displacement of volume by the diaphragm in the pump head, in combination with check valves, makes for a reliable positive displacement metering pump. Motor driven mechanical metering pumps are both economical and simple, yet retain a high degree of versatility. The LK Series pumps have flange connections available, improving installation flexibility. Three main pump head materials are PVC, stainless steel, or PVDF. A wide range of chemicals, such as acid, alkalines, organic solvents, slurry, and high-temperature liquids, can be effectively pumped with the LK series. Six different liquid end materials combinations can be chosen to best fit the application. 

Stroke Adjustment

Output of flow is regulated by changing the volume per stroke with a micrometer Stroke Length dial. Accurate and reliable adjustments are made possible with the spring-back mechanism of the LK design ensuring repeatable performance.


The LK-A, LK-B, and LK-C series pump are designed to be fit with general-purpose, vertically mounted TEFC outdoor-use motors, providing different voltage and enclosure options, including VFD-ready and explosion-proof designs.

Drive Component

The heart of the LK series is the dual-cam gearbox with a highly reliable, built-in worm gear type reduction unit. This compact and rigid drive unit achieves maximum wear resistance during continuous operation. The aluminum bronze worm gear designed with a large module ratio combined with a tapered roller bearing used at the end of the worm gear enables efficient transmission of motor power to the gearbox. A fully enclosed oil bath lubrication system keeps wear to a minimum while permitting outdoor installation. The LK Series was designed for durability during continuous operation providing long life.


Download LK Series Metering Pump Brochure

Call us today at (855) 737-4714 to learn more, or fill out our online form and someone will get back to you.