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Sponsored Article

Full isolation dual seal precision dispense pump

09 February 2024

The Lee Company’s Full Isolation (FI) Dual Seal Precision Dispense Pump is a positive displacement, variable volume pump engineered to control more challenging fluids across an extensive cycle life reliably.

Traditional single-seal pumps are limited by certain fluid properties. For example, fluids prone to crystallisation can scratch the seal, leading to increased wear and a shortened life. 

Likewise, fluids containing high concentrations of surfactants are susceptible to leakage due to their low surface tension, which can cause failures in the mechanical portion of the pump. 

The Lee Company’s robust FI Dual Seal Pump is specially designed to handle these challenging fluids, offering sealing reliability above and beyond a typical single seal pump.

The innovative dual seal design of this pump prevents leakage and significantly extends cycle life in applications that require harsh working fluids, such as DNA sequencing and synthesis, immunoassay and haematology, and medical device, pharmaceutical and industrial manufacturing.

The FI Dual Seal Pump is offered in two standard full-stroke dispense volumes and includes both a home sensor to establish the end-of-stroke position and an optical encoder to provide feedback on piston movement.

Performance parameters, dispense volumes, port head configuration, and materials can be customised to meet specific application requirements. Contact your local Lee Sales Engineer for additional technical assistance and application information.

The FI Dual Seal Pump’s innovative design utilises two seals to isolate the motor from the working fluid. The range of piston movement is shorter than the spacing between the primary and secondary seals which guarantees no part of the piston in contact with working fluid will ever retract past the second seal. 

Between the two seals is the seal isolation chamber, which can be used in various ways to prevent crystallisation and dilute working fluid residue on the piston. The simplest method is to plug this chamber and leave it full of air. This limits the evaporation of the working fluid residue on the piston, reducing the build-up of harmful crystals. 


Alternatively, the chamber can be filled with a barrier fluid and plugged. This prevents crystallisation and dilutes surfactants which eliminates leakage. In the most extreme cases, the seal isolation chamber can be actively flushed with liquid, consistently diluting the working fluid while washing the piston and primary seal.


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