Air Filter/Dryer for Purge Systems | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Air Filter/Dryer

Definition

An air filter/dryer is a critical component within purge air systems that cleans and dries compressed air by removing particulate matter, oil aerosols, and water vapor to prevent contamination and corrosion in downstream equipment and processes. This unit integrates filtration and drying functions into a single housing, typically constructed from stainless steel or aluminum alloy. The filtration stage uses coalescing filters made of polyester or glass fiber to capture solid particles and liquid droplets, while the drying stage employs desiccant materials such as activated alumina or silica gel to adsorb moisture, or a refrigeration system to condense and remove water vapor. The device is designed for operating pressures between 1.0 and 1.6 MPa, with flow capacities ranging from 15 to 60 m³/min (ISO 1217). Filtration ratings vary from 0.01 to 5 μm, achieving ISO 8573-1 purity classes 1–4 for particulates, 2–3 for moisture (pressure dew point -40 to -20 °C), and 1–4 for oil content (0.01–0.5 mg/m³). Operating temperature ranges from 1 to 65 °C, with ambient temperature limits of 1–50 °C for outdoor installation. The unit is available with flanged or threaded connections (DN25–DN100, ISO 7005) and weighs 15–60 kg depending on flow capacity. Electrical requirements include a 24 V DC solenoid drain valve (±10%) and a heater/controller consuming 10–30 W. Enclosure protection is rated IP54–IP65 (IEC 60529) for washdown areas. Body material is aluminum alloy with corrosion-resistant coating (GB/T 3190). All specifications are reference ranges and must be verified with the legal manufacturer for specific models and applications.

Working Principle

Compressed air enters the filter/dryer where it passes through filtration media (such as coalescing filters) to capture solid particles and liquid droplets. For drying, the air may pass through desiccant materials (like silica gel or activated alumina) that adsorb moisture through physical or chemical processes, or through refrigeration systems that cool the air to condense and remove water vapor. The cleaned and dried air then exits the unit for use in downstream processes. Regular monitoring of pressure differential across the filter and dew point is essential to ensure optimal performance.

Common Materials

Stainless steel housing, Polyester/glass fiber filter media, Activated alumina/silica gel desiccant

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow Capacity	15–60 m³/min	At 1.0 MPa inlet pressureISO 1217
Filtration Rating	0.01–5 μm	Class 1–4 for particulatesISO 8573-1
Pressure Dew Point	-40–-20 °C	Class 2–3 for moistureISO 8573-1
Oil Content	0.01–0.5 mg/m³	Class 1–4 for oilISO 8573-1
Operating Temperature	1–65 °C	Above 65°C seals degrade
Ambient Temperature	1–50 °C	For outdoor installation
Voltage	24 ±10% V DC	For solenoid drain valve
Power Consumption	10–30 W	For heater and controller
IP Rating	IP54–IP65	IP65 for washdown areasIEC 60529
Body Material	Aluminum alloy	Corrosion-resistant coatingGB/T 3190
Weight	15–60 kg	Depends on flow capacity
Connection Size	DN25–DN100 mm	Flanged or threadedISO 7005

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Filter Housing
Contains and protects the filtration and drying media

Material: Stainless steel or aluminum
Coalescing Filter Element Part
Removes oil aerosols and fine particulate matter from compressed air

Material: Glass fiber or synthetic fiber media
Desiccant Bed Part
Adsorbs moisture from the air stream through physical or chemical attraction

Material: Activated alumina or silica gel
Drain Valve
Automatically removes accumulated liquids from the filter housing

Material: Brass or stainless steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Purge Air System

View system integration details

Manufacturers of Air Filter/Dryer

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Frequently Asked Questions

What is the operating pressure range for this air filter/dryer?

The reference operating pressure range is 1.0–1.6 MPa. However, the actual allowable range depends on the specific model and must be confirmed with the manufacturer.

What filtration ratings are available?

Filtration ratings range from 0.01 to 5 μm, corresponding to ISO 8573-1 purity classes 1–4 for particulates. The exact rating varies by model and should be verified.

How does the drying process work?

Drying can be achieved via desiccant materials (e.g., activated alumina or silica gel) that adsorb moisture, or via refrigeration cooling to condense water vapor. The specific method depends on the model.

What are the electrical requirements?

The solenoid drain valve operates on 24 V DC (±10%), and the heater/controller consumes 10–30 W. These values are reference ranges; confirm with the manufacturer for your model.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 16 bar (232 psi)
dew point:	-40°C to +3°C
flow rate:	0.5 to 100 m³/min (17.7 to 3531 CFM)
temperature:	+1°C to +65°C

Air Filter/Dryer

Product Specifications

Applied To / Applications

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Application Fit & Sizing Matrix

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Compliance & Manufacturing Standards