FRL Unit

An FRL unit is made up of a filter (F), regulator (R), and a lubricator (L). They are usually utilized as one unit to ensure clean air in a pneumatic system but can also be used separately. Having a proper FRL unit set up in a pneumatic system offers higher reliability of the components downstream, cut down your power waste due to over pressurization, and enhanced component lifetime. The three components work together to do the following job:

● Filters remove dirt, water, and other detrimental debris from an air system. This is often the first step in improving air quality.
● Regulators regulate and control the air pressure of a system to make sure that down-line components do not surpass their maximum operating pressures. This is the second step in the FRL unit.
● Lubricators are responsible for reducing the internal friction between the surfaces of the equipment and parts by means of administering a controlled amount of mist oil into the compressed air and releasing the lubricating fluid into the machinery. This process is typically carried out last and/or right before the component lubrication is needed.


The filter is there to clean pollutants out of the air in the line as the name implies. As with most filters, it acts as a strainer, enabling air to flow through while trapping dirt, rust, dust, et cetera. The filter separates liquids into oil and water as well. The filter serves as the first stage inside an FRL system, which is incorporated with the upstream of the regulator as well as the lubricator.

You are probably familiar with the concept of how annoying pollutants can be in your pneumatic system. The dirt and other particles have to go somewhere. They go directly into the parts in the equipment where the air is contained. The pollutants gum up your tools and elevate friction, eventually resulting in loss of functionality or complete breakage.

The more you can filter out such pollutants and keep them out of your equipment, the less idle-time you will have to encounter. Idle-time is exorbitant, so it pays to have the best filter you can find in your FRL. You can select from three different filter types: general-purpose, vapor, and coalesce. General-purpose filters can pull out both liquids and particles. Vapor filters seize odor and oil vapor. Coalescing filters remove oil. Please bear in mind that filters will cause a drop in pressure, so you need a filter that will get the job done without lavishing too much pressure.


The regulator exists to steady pressure at a level that is right for your system. They can lower pressure coming into the system upstream while seeking to preserve incessant flow downstream. Preferably the regulator should maintain perfect constant pressure; but in truth, it will always be influenced by what is occurring upstream. The two primary types of general-purpose regulators include the relieving and non-relieving regulators.

The relieving type can let the pressure off from the system as necessary. The hissing noise you hear from pneumatic systems is the sound of this type releasing the system. A non-relieving type does not act like this. You will need another approach to release the pressure within the system with non-relieving regulators. Last, a regulator should be chosen based on what sort of flow and pressure requirements you have for your equipment.


The major part of tools used with pneumatic systems requires lubrication to function effectively and to decrease tear and wear from internal friction. While it is sometimes possible to lubricate these tools utilizing a grease gun or other method, it is often less messy and more efficient to lubricate them through the airflow. A lubricator is an FRL unit that allows you to add an exact level of lubricant to avert over-saturating your tools.

The oil added has an extra advantage: it can clear out unpleasant oils from the system, such as those from the compressor. You will have two options: either oil-fog or micro-fog. While micro-fog delivers much smaller drops to form a mist, oil-fog delivers larger drops to the airflow.

How does FRL Unit Works?

Filter, regulator, and lubricator (FRL Unit) compressed air systems are utilized to deliver clean air, at a fixed pressure, and lubricated to make sure adequate pneumatic component operation and extend their operational lifespan. The air supplied by compressors is often over-pressurized, non-lubricated, and times contaminated meaning that an FRL unit is required to avert damage to equipment.

Filters, regulators, and lubricators can be bought separately or as a package based on what is required to ensure adequate air specifications are being met for downstream equipment. It is suggested to install these devices if you are planning to do the following things:

● Want to better the service life, safety, and reliability of your air system Urgent need of clean air to be delivered to your facility or workplace
● Want to install an HVAC system
● ISO, OSHA, and ASHRA compliance, or other air quality standards is required
● Use pneumatic equipment and tools

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