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Compressed Air Dryer Filter And Accessories

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OEM Water/Dust/Oil Removeal Compressed Air Dryer Filter Manufacturer in China

A compressed air filter is a solid-liquid separation filtration device. Above all, the main function is to filter out dust and solid particulates in the air. And separate the water droplets and oil vapors in the compressed air. Besides, the air compressor water separator can also remove odor. The filters are usually in the front or back of the refrigerated air dryer. We are one of the most professional compressed air filter manufacturers in China. Lingyu produces high-quality coalescing compressed air dryer filters with automatic drains. Welcome to inquire us!

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Technical Parameters of Compressed Air Dryer Filter

Working medium
General compressed air
Nominal flow rate
1.5 to 22m³/min (thread connection)
Flange connection
Maximum nominal pressure
Max 16 bar (25bar & 40bar customizable)
Pressure drop or loss
Operating temperature
up to 80°C
Filtration accuracy
5μm, 1μm, 0.01μm
thread and flange connection
Filter element material
HV glass fiber filter material
Casing material
Die-cast aluminum alloy, carbon steel, and stainless steel are available.

Why Choose Our Inline Compressed Air Filter?

1. 100% HV Filter Paper Imported From The USA

Firstly, the filtration effect of our air compressor water separator is over 99.999%. We use a flat-wound glass fiber filter with a 96% porosity ratio. And the filter element does not absorb water and swell. So it can significantly improve coalescing filtration performance. In addition, our filter elements' lifetime is up to 6000-8000 hours.

2. Cast Aluminum Alloy Housing, 100% Secondary Pressure Test

Secondly, it uses first-class die-casting aluminum alloy. Good pressure and air tightness. Because of tight construction, it ensures safe use. Furthermore, our filters pass the test twice. The housing can be under pressure for 96 hours @3.2Mpa. The maximum burst pressure is 10.5 Mpa. Besides, our filter casing lifetime can last 10 years.

Additionally, the filter housing is airflow-optimized. Because of the smooth elbow design, the airflow is smoother. The differential pressure is shallow (that is, pressure drop: about 0.2 to 0.25 bar). For example, a pressure drop of 1 bar is approximately equal to 7% to 10% of the compressor power loss. Therefore, it can greatly reduce energy consumption and operating costs.

Moreover, the precision thread inlet/outlet port makes installation easy. In addition, you can choose the parallel connection of the housing. Then it can reduce installation and maintenance space.

3. Internal Electrophoresis Treatment, Surface Anti-corrosion Treatment

Thirdly, take all filter shells with anti-corrosion treatments before painting. For example, cleaning and degreasing, etc. This increases durability and prevents secondary contamination. Thus it can effectively protect the air quality.

Painting together with a special anti-corrosion treatment for better adhesion. There are many advantages, such as no peeling and no delamination. So compressed air dryer filter has better corrosion resistance.

4. SS304 Stainless Steel Support Mesh

Fourthly, the support mesh uses two 0.5 mm 304 stainless steel layers. So it can ensure the necessary rigidity of the filter layer. At the same time, it won’t reduce the filtration area. In addition, the mesh passes ultrasonic secondary cleaning. Drying in the oven. So it can avoid the residual oil.

5. UP to 16bar, 25bar & 40bar Inlet Air pressure

Fifthly, the max operating pressure of our regular air compressor water separator is 1.6MPa. So it has a wide range of applications. Besides we can also customize the high-pressure compressed air dryer filter. For example, 25bar and 40bar particulate and coalescing air filters.

6. Customize Medical Or Food-grade Air Compressor Moisture Separator

Sixthly, besides ordinary filters, we also customize them for special industries. For example, the medical, food, and pharmaceutical industries must require 304 stainless steel. In addition, activated carbon compressed air filters can remove odor.

7. Strict Quality Control For Compressed Air Dryer Filter

Above all, we use high-quality element materials. More importantly, we have perfect testing equipment and processes. After processing the filter element, we test the filtration accuracy. Nextly, test the filter housing and head for leakage. Then do we surface-treat and test? Finally, assemble the air compressor water separator filter. And check the finished product for leaks.


It removes aerosols of liquids such as water and oil by coalescing. Coalescing is the process of capturing smaller droplets along a filtration medium. This is until they combine into larger droplets.

The droplets continue to coalesce until their weight is large enough. Finally, under gravity, they fall to the bottom of the air compressor water separator filter. Then they are discharged by the drainer.

Filter life and dirt-holding capacity are limited. Therefore, compressed air quality cannot be guaranteed when its life expires. Usually, the replacement cycle of our filter element is 8000 hours.

In addition, it is not only to ensure air quality but also to consider pressure loss and energy consumption. The additional power of the air compressor must compensate for the pressure loss of the filtration system. As a result, the power consumption of the compressor increases. Eventually, operating costs and expenses will rise. Now take two examples for comparison.


Electricity fee: 0.07USD/kWh,

For every 100SCFM air consumption, the pressure loss will increase by 1PSIG,

Finally annual increase in electricity bills due to pressure loss: 67 USD.

Case 1:

Filter element purchase cost = $400.00;

Air consumption = 500 SCFM;

Initial pressure loss = 2 PSID;

Pressure loss before filter element replacement= 5 PSID;

Filter element lifetime = 6 months;

So average pressure loss during filter element use: 3.5PSID;

Increased electricity bill: 3.5 X (500/100) x 67 = 1,172$;

Because replacing the filter element is twice a year, the total annual cost is 400X2 + 1,172 = 1,972$

Case 2:

Filter element purchase cost = $400.00;

Air consumption=500 SCFM;

Initial pressure loss = 5 PSID;

Pressure loss before replacing the filter element = 10PSID;

Filter element service life = 1 year;

Average pressure loss = 7.5 PSID;

Operating electricity bill increase = 7.5 PSID X (500/100) X 67 = 2,512$;

So total annual expenses = $400 + $2512 = $2,912

In conclusion, in case 2, the filter element was used twice as long as in case 1. However, the total cost increased by $940 due to a bigger pressure loss. So much more than the cost of replacing the filter element ($400). Thus, we must exchange the air compressor water separator filter element in time.

Firstly, this gauge is not a service indicator for the air compressor water separator. Besides, it is also not an indicator of air quality either. It just shows the differential pressure roughly. Or indicate whether the filter element is blocking in advance.

Filter fibers gradually become brittle during use. So even a tiny hole can cause the filter media to break. Then contaminants will enter the downstream compressed air system without filtration.

In this case, the pressure difference between the front and rear of the compressed air filter is not large. So the pointer will always be in the green area.

So the filter element will not be replaced in time. And when we find there are already a lot of pollutants downstream.

Generally, filters only remove solid and liquid particles. However, water vapor and oil vapor can still pass the filter material. Therefore, the mechanical filter cannot filter them out. Of course, except for the activated carbon compressed air filter.

To fundamentally remove water vapor and oil vapor, only use a dryer to lower the dew point.

Many people mistakenly believe that it is enough to choose a high-precision filter. This saves costs. This is not correct.

Air quality depends on the accuracy of a single filter. But without the pretreatment protection of the pre-stage filter, the high-precision filter element will be blocked soon due to excessive load.

So it will speed up the replacement frequency of the filter element. Finally, it will increase the production cost in a disguised form.

In some industrial situations, there is often inhalation of dangerous air, liquids, or particles. To protect our workers, filtering is necessary.

For example, carbon monoxide is a toxic gas. If without filtration, it will be a hazard to our workers. A breathable compressed air dryer filter can remove these harmful gases. It can convert carbon monoxide into carbon dioxide.

Compressed air has more and more wide applications in industry. At the same time, the quality requirements for compressed air are getting higher and higher.

The air will contain many impurities, such as bacteria and dust. Some industries require it to be sterile-filtered. Otherwise, it will affect the production of the enterprise. It will also increase the consumption of resources and funds.

We can produce quick-fit stainless steel compressed air sterilizing filters. These sanitary filters are popular in industries such as beer, dairy, pharmaceutical, beverage, food, etc.

Unlike general air compressor water separator filters, its housing is 304 stainless steel. Besides, the filter element is not a filter paper material but PTFE.

It sterilizes the air with high-temperature steam. The sterilization efficiency can reach 100%. The time is about 20 to 30 minutes.

Filtration accuracy refers to the max size of particles that the element can block. The higher the filtration precision, the smaller the particle size blocked.

But it is also easier to be blocked by particles with larger sizes. Therefore, using high-precision filters regardless of the occasion cannot guarantee improving filtration efficiency. Besides, it will affect the service life.

The largest contaminant in compressed air is water. Water includes liquid water and moisture vapor.

Air compressor water separator filter can remove liquid water. But it cannot remove moisture vapor. Besides, as the temperature decreases, the latter condenses into liquid water.

So this brings great trouble to the downstream pneumatic equipment. Water vapor can only be removed with the air compressor dryer. Therefore, a compressed air filter cannot replace it.

Refrigerant air dryer has rated requirements for inlet air temperature and pressure. In addition, the refrigerant dryer also requires that there is no liquid water in the air. So it can avoid increasing the refrigeration load.

This requires a pre-filter or air-water separator. The requirements for air compressor air dryer filter precision are not very high. Our pre-filters have a filtration precision of 1.0 μm.

The dust particles in the air do not significantly affect the cooling capacity. Water vapor requires the involvement of particles in the condensation process. Besides, the condensation water with larger sizes is easier to separate than the smaller ones. Finally, all these solid particles will be discharged with the condensate.

This reflects that the refrigeration air dryer itself has a self-cleaning function. So there is no point in having an air compressor water separator filter with too high a precision before the refrigerated dryer.

Firstly, desiccant dryers have higher filter requirements than refrigerant dryers. Because the adsorbent is very sensitive to oil. The oil vapor content should be under 0.1mg/m³. Otherwise, it will influence the water-removal effect of the adsorbent. Besides, it will shorten the lifetime.

Secondly, the adsorption dryer should have a dust-removal compressed air filter. The filtration precision is 0.01 microns. Because of the constant friction between the adsorbent particles, it will generate dust. Then this dust will enter the downstream air pipe. Eventually, it will cause secondary air pollution. So there must be a high-precision filter.

Pressure drop is an important indicator of an air compressor water separator. In addition, it can also measure the working life of a filter element.

Firstly, the filter element has a tiny initial pressure drop. But with time accumulation, the pressure drop will tend to rise.

When reaching a certain value, the lifetime of the filter element ends. At this time, it should replace the element.

To observe in time, we should add a differential pressure gauge. It can show the pressure drop of the compressed air filter at any time.

The housing is an important part of the air compressor water separator. It withstands the full internal pressure. Therefore, the filter housing must have high tensile and compressive strength.

In addition, the working conditions of air compressor dryer filters are generally harsh. The inner wall of the filter housing is often in contact with the oil-water mixture. Thus, it should have an anti-rust and anti-corrosion ability.

They are different. The compressor filters are used for the screw air compressor. And it includes there kinds of filters. That is the intake air filter, oil filter, and air-oil separator.

But the compressed air dryer filter belongs to the air treatment equipment. And we usually install them onto the main pipe. These filters work with dryers to purify compressed air. Because the air compressor water separator filter can remove dust, moisture, and oil vapors.

Firstly, activated carbon has a huge surface area. So it has a strong physical adsorption ability. And it can adsorb chemical impurities such as organic vapors, sulfur, carbon dioxide, and various micro-organisms.

Therefore, it is widely used for oil removal and deodorization applications. Or we also use it as a sterilization filter. Oil vapors can easily pass through coalescing filters. So we need this carbon filter.

The main function of an activated carbon compressed air filter is to remove oil and hydrocarbon vapors. They are most commonly used where removing taste or odor is critical. For example, food processing and pharmaceuticals.

Since moist air reduces activated carbon adsorption, generally install it after the desiccant dryer. In addition, activated carbon filters can’t remove liquid oils or sols. So poor maintenance or no pre-filter will accelerate its performance failure.

There is a float drainage system in the automatic drain. When the pressure is low, the drain is closed. So it will not carry out drainage work at this time.

However, when the buoyancy and pressure are in balance, it starts to drain in drips. When the buoyancy force is greater, the drain port will open. Then it carries out drainage. So it works cyclically according to the buoyancy force.

The pre-filter is also namely the rough/coarse filter. In most cases, it is used at the front end of the pipeline. Therefore, we call it the compressed air pre-filter.

The main function is preliminary compressed air filtering, such as oil, moisture, dust, and rust. It can protect the fine filters downstream. To prevent large impurities from damaging the precision filter.

On the contrary, the post-filter mainly refers to high-precision filters. Its filtration accuracy will be much higher. Besides, we usually install it at the back end of the pipeline.

There are many reasons for air leakage, such as the automatic drain or drain valve leaking, poor closure of the filter end cap, or filter housing leakage. So the troubleshooting is as follows:

  1. Close the drainer well; clean up impurities in time; or replace a new automatic drain;
  2. Contact the compressed air filter manufacturer to exchange a new end cap or housing.
  • Working medium: general compressed air.
  • Nominal flow rate: 1.5 to 22m³/min (thread connection);
  • 28.5~170m³/min (flange connection);
  • Maximum nominal pressure: Max 16 bar (25bar & 40bar customizable);
  • Pressure drop or loss: 0.2~0.25bar;
  • Operating temperature: up to 80°C;
  • Filtration accuracy: 5μm, 1μm, 0.01μm;
  • Connection: thread and flange connection;
  • Filter element material: HV glass fiber filter material.
  • Casing material: die-cast aluminum alloy, carbon steel, and stainless steel available.