A Filter Regulator Lubricator (FRL) unit is a critical pneumatic component used in compressed air systems. It is typically installed between the air compressor and the AODD pump — and helps prepare the compressed air for safe, efficient, and consistent pump operation. Using an FRL unit can significantly extend the lifespan of your AODD pump and improve its performance.
The FRL unit is comprised of three individual components connected in series. Each plays a distinct and important role in preparing compressed air before it reaches the pump:
Removes moisture, dust, debris, oil particles, and other contaminants from the compressed air supply before it enters the pump.
Controls and maintains the compressed air pressure at the desired operating level (PSI/Bar) required for your specific pump model and application.
Adds a controlled amount of oil (SAE 40) to the compressed air stream to lubricate internal air valve components and keep them moving smoothly.
Compressed air from most industrial compressors contains moisture, dust, rust particles, and oil vapour. If this contaminated air enters the AODD pump directly, it can corrode internal metal parts, block small air passages, and damage the air valve — leading to stalling and premature pump failure.
The filter in an FRL unit traps these contaminants before they can reach the pump. Most FRL filters have a bowl that collects the separated moisture which can be drained manually or automatically.
Air compressors typically deliver air at a higher and fluctuating pressure than what an AODD pump requires for optimal operation. Without a regulator, pressure spikes can damage internal components and cause erratic pump behaviour.
The regulator allows operators to set and maintain a precise operating pressure — which directly controls the flow rate and discharge pressure of the AODD pump.
The AODD pump's air valve and internal spool mechanism have moving parts that require lubrication to operate smoothly. Without lubrication, these components experience increased friction, wear, and the risk of stalling — especially in high-duty applications.
The lubricator adds a fine mist of oil (typically SAE 40 grade) into the compressed air stream. This oil travels with the air into the pump and lubricates the internal air valve components continuously during operation.
By using an FRL unit, compressed air is filtered, regulated, and lubricated before it reaches the pump. The combined benefits are:
Antlia Engineering Works supplies FRL units along with AODD pumps for complete, ready-to-install pneumatic pump systems. Contact us for pricing and technical guidance.
Get a Free Consultation Call +91 9819395995An FRL unit stands for Filter, Regulator, and Lubricator. It is a pneumatic component installed between the air compressor and AODD pump. The filter removes moisture and contaminants, the regulator controls air pressure, and the lubricator adds oil to keep pneumatic components running smoothly.
An FRL unit ensures the compressed air entering the AODD pump is clean, dry, and properly pressured. Clean air prevents internal valve damage, regulated pressure ensures consistent flow, and lubrication keeps the air valve moving smoothly — extending pump life significantly and reducing downtime.
SAE 40 grade oil is typically recommended for the lubricator in an FRL unit used with AODD pumps. The oil is metered into the compressed air stream in small quantities to lubricate internal air valve components continuously during operation.
The FRL unit should be installed between the air compressor and the AODD pump, as close to the pump as practically possible. It should be mounted in the correct orientation (usually vertical with the bowl facing down) for efficient moisture drainage and proper oil distribution.