Overlook Industries: World Leaders in Innovative Single-Use Liquid Dispensing Technology

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Pump Types

Overlook can design and manufacture high quality filler needles to retrofit any genre of dispensing system..

- Peristaltic Pump

Preferred Usage: Metal-sensitive products, filling lines that benefit from ultra fast line changeover and little to no cleaning and sterilization between runs.
Contraindications: Very viscous products, products that negatively interact with platinum-cured silicone tubing.
Description: Peristaltic pumps work by pressing and dragging a series of metal rollers against flexible pump tubing that contains liquid, moving it downstream towards the dispensing tip. Pressure is created when the flexible tubing is sandwiched between the rollers and the metal cap of the pump head. Peristaltic pumps have both single and dual-element pump heads. Dual-element pump tubing, often referred to as a "double-Y" (due to the shape of the configuration), moves half as much product per side per cycle, but effectively moves the same amount of product as a single-element pump head, albeit with a significant reduction in fluid path pulsation, leading to a more precise dispense.

Watson-Marlow 505S

Watson-Marlow Flexicon PD22I

Overlook Freedom Filler™ kit, designed
for dual-element peristaltic pumps

- Rotary Piston Pump

Preferred Usage: Ultra-low volume dispenses, dispenses where the utmost precision is required, viscous products.
Contraindications: Products that are metal-sensitive, situations where the utmost flexibility is needed between runs.
Description: Rotary piston pumps have long been considered the most precise and accurate pumps on the market. They are capable of dispensing thicker products than a peristaltic or time-pressure system, but require cleaning and sterilization between runs. Due to the fact that tubing does not wear out over time (as with a peristaltic pump), there is no need to recalibrate fill volumes during the campaign.

Bausch + Ströbel rotary piston pumps
on a B+S KSF liquid filling machine

Bausch + Ströbel rotary piston pump

Bosch rotary piston pump

- Rolling Diaphragm Pump

Preferred Usage: Dispense that required high accuracy and precision that can also benefit from single-use technology.
Contraindications: Products that are sensitive to certain plastics.
Description: Bosch is the name that comes to mind in regards to rolling diaphragm pumps. With the availabilty of their latest disposable rolling diaphragm pump comes the opportunity for users to benefit from the same level of precision and accuracy as before, combined with the ability to throw out the entire fluid path. Unfortunately, the setup is very expensive, which may prohibit many potential customers from more readily utilizing this technology.

Rolling diaphragm pumps gently move product and are used when the utmost delicacy is needed during dispensing.
Bosch single-use rolling diaphragm pumps

Bosch rolling diaphragm pump

- Time-Pressure System

Preferred Usage: Large, multi-head filling machines, ultra high output filling machines.
Contraindications: Viscous products, products that are sensitive to platinum-cured silicone tubing.
Description: Time-pressure systems are incredibly effective at dispensing several accurate and precise doses in a short period of time, making them perfect for high output filling machinery. They are comprised of a pressurized product vessel and pinch valves on each head that are opened for the appropriate amount of time to dispense a specific volume of product. A checkweigh or electronic eye system keeps track of the volume of product within the pressurized vessel, calling on a simple peristaltic pump to keep it topped off when needed. The biggest problem associated with time-pressure systems is a requirement for a pressurized stainless steel product vessel that must be cleaned and sterilized between each run.

Bausch + Ströbel time-pressure system,
needle carriage

Bausch + Ströbel time-pressure system,
manifold