���ϳԹ� cholesterol is the gummy, sometimes abrasive varnish that forms when raw, compressed air is permitted to contaminate the veins and organs of your air circuit. When you combine atmospheric moisture, compact it into a smaller space, and add microscopic particles too fine for the inlet filter and ingested by the air compressor, you create dangerous LDL-level pneumatic cholesterol. Now add the heat of compression along with a sprinkle of compressor oil, and you’re looking at oxidized ApoB level lipoproteins ready to infect your entire pneumatic system.

Unlike the myocardial infarction, which is a catastrophic pneumatic failure, such as a burned-out valve coil or blown manifold O-ring, pneumatic cholesterol manifests slowly yet malignantly. It coats high-precision spools, emulsifies with water and assembly lube, and turns to varnish when exposed to prolonged heat. Valves stick, cylinders chatter, and repeatability goes out the window.

You will experience a gradual loss of efficiency, and, just as with your own body, you may not notice until symptoms arise (hopefully mild in both cases!). You may experience reduced cycle times, production bottlenecks, or a single-point failure that can lead to cascading failures in sophisticated factory automation applications. When you practice reactive maintenance rather than preventive maintenance, you essentially subscribe to “sick care” rather than healthcare.

We now know that lifting heavy weights, eating whole, unprocessed foods, and engaging in bursts of high-intensity exercise will prevent 99% of today’s cardiovascular and metabolic diseases, and so too can you prevent such chronic conditions in your pneumatic system.

Preventing the slow, operational decay of your machine from the inside out doesn’t have to be the sole responsibility of your FRL (Filter, Regulator, Lubricator). Still, it’s certainly one of the most important and effective interventions for the task. There’s a reason you see FRLs strategically positioned throughout your facility and at nearly every leg of the system.

The filter traps the raw materials required to formulate pneumatic cholesterol, such as water, particles, and oils, before they can combine into a nasty paste ready to destroy the inside of all you love. ���ϳԹ� filters use a cyclonic effect to remove fluids, and the sintered bronze filters trap what’s left with a single-digit micron efficiency. Filters will collect so much water, in fact, that manufacturers offer them with automatic drains.

The regulator keeps (“blood”) pressure in check, providing enough to operate cylinders and motors without dizzy spells while preventing excessive, damaging pressure that would tax the compressor. Remember that up to 90% of the energy used in pneumatic systems is wasted as heat from compressing air, so get that “resting heart rate” (pressure) down by reducing your compressor’s unloading pressure.

Of course, any solid health regimen can’t do without a supplementation protocol. Vitamin D, magnesium, creatine, and fish oil are staples to any health journey, and so too is the lubrication you add back in for your precious and sensitive valves, regulators, and actuators.

A lubricator will deliver a micro-mist of fresh, clean oil to neutralize friction while protecting moving components with minimal friction and maximum cooling, helping wash away varnish buildup before it clogs pneumatic arteries.

Just like diet and exercise are mandatory to good bodily health, FRLs are the single most effective component to install throughout your facility to show your pneumatic machines how much you love them and care about their cardiovascular health.

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The Type 385 Stainless Steel Filter features corrosion-resistant 316L stainless steel construction throughout the body, housing, trim, and filter assemblies, making it ideal for offshore, chemical processing, food and beverage, pharmaceutical, and other harsh operating environments. Large internal porting and oversized flow paths deliver high flow capacity with minimal pressure drop, helping maintain stable downstream performance in high-demand pneumatic systems.

Available with either manual or automatic drain configurations, the Type 385 is engineered for reliable moisture and particulate removal while reducing maintenance requirements and improving system performance. Standard filtration is 40 micron, with an optional 5 micron element available for enhanced air cleanliness. The unit also offers a low temperature option for operation down to –61°F (–52°C).

Designed for versatility and durability, the Type 385 Stainless Steel Filter is well suited for use with large volume valve actuators, pneumatic instrumentation, process automation systems, and other applications requiring dependable air filtration under difficult environmental conditions.

The Type 385 offers maximum supply pressure ratings up to 450 psig (31 bar), with flow coefficients up to Cv 13. Port sizes are available in 3/4 or 1 in. NPT configurations, with dual 1/4 in. NPT gauge ports and 1/8 in. NPT exhaust connections. Operating temperature range is –40 to 200°F (–40° to 93°C), with optional low temperature operation from –61° to 194°F (–52° to 90°C). The unit is available with optional automatic drain, low temperature operation, 5 micron filtration, and ATEX 2014/34/EU certification for use in potentially explosive atmospheres.

ControlAir LLC
www.controlair.com

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Compressed air is widely used in manufacturing, but contamination is a major concern. To maintain air quality, compressed air systems rely on filters — particularly coalescing and dry particulate filters — that remove oil, water aerosols, and solid particulates. These filters use replaceable elements that degrade over time due to harsh operating conditions like pressure variations, high humidity, and chemical attack.

Filter media is constantly bombarded by contaminants, weakening its structure. If the media is damaged — even with a pin-sized hole — it compromises filtration, allowing contaminants to pass downstream. Thus, filter elements have a finite life and should be replaced regularly, typically every 12 months, regardless of usage duration. This ensures consistent air quality and protects downstream equipment.

Many users mistakenly rely on differential pressure (DP) indicators to determine when to replace filter elements. However, DP devices are imprecise (±25% accuracy) and are designed only to detect premature blockages — not as reliable indicators for routine maintenance or air quality. In fact, a torn filter may show no DP change at all, falsely indicating that the system is functioning well.

Using clogged or damaged filters can increase system pressure losses, leading to higher energy costs and reduced equipment efficiency. Every 1 bar of extra pressure can raise energy consumption by approximately 7%. Additionally, contamination due to filter failure can result in costly damage to equipment and product spoilage.

A white paper, “” by Parker Hannifin stresses that preventative maintenance — changing filter elements and float drains annually with proper parts safeguards system integrity, ensures compliance with ISO 8573-1 standards, and preserves manufacturer guarantees. Washing or reusing filters is ineffective and damaging.

Timely replacement of compressed air filter elements is essential for maintaining air quality, operational efficiency, and long-term cost savings. DP indicators should not be used as the sole maintenance trigger. Instead, users should follow manufacturer guidelines to avoid contamination risks and ensure system reliability.

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