Compressed Air Maintenance
Filter Regulators for Compressed Air – Filter & Regulator Combined
A filter regulator combines two functions in one unit: it cleans compressed air of condensate and particles while maintaining a constant set working pressure. Instead of installing a filter and regulator separately, you save space, fittings, and installation time. At STASTO, you will find filter regulators from the FR01/FR and Gold FR04 series for common port sizes from G1/4 to G1 – designed for continuous operation in industrial compressed air maintenance.
Filtering & Regulating in One Housing
Advantages
Why a Filter Regulator from STASTO
Filter regulators reduce components and leak points, maintain constant secondary pressure and reliably drain condensate – in robust designs for continuous industrial operation.
Two Functions, One Device
Filtration and regulation in one housing: fewer components, fewer leak points, more compact service unit.
Defined Filter Fineness per Series
Filter element 20 µm for the FR01/FR series, 5 µm for the Gold Series FR04-M – matched to the required air quality of your application.
Constant Secondary Pressure
Adjustable pressure range 0.5…8 bar (FR01/FR) or 0.5…10 bar (FR04-M), with secondary exhaust for precise reduction of outlet pressure.
Semi-Automatic Drain Valve
Accumulated condensate is reliably drained without requiring manual intervention.
Product range
Filter regulator series and supplementary regulators
From the standard FRL line FR01/FR and the Gold Series FR04 with gauge and micro variants to standalone pressure regulators and precision pressure regulators.
Series comparison
FR01/FR vs. Gold FR04-M compared
The standard line FR01/FR and the compact Gold variant FR04-M differ in filtration fineness, pressure range, inlet pressure and bowl design.
| FR01/FR | Gold FR04-M | |
|---|---|---|
| Line | FRL standard line | Gold line, compact |
| Filter element | 20 µm | 5 µm |
| Pressure range | 0.5…8 bar | 0.5…10 bar |
| Max. inlet pressure | 16 bar | 25 bar |
| Flow rate | up to 1200 Nl/min (G1/4, 6.3 bar, Δp = 1 bar) | up to 900 Nl/min (G1/4, 6 bar, Δp = 1 bar) |
| Bowl | Plastic with guard bowl | Metal |
| Drain valve | semi-automatic | semi-automatic |
Application areas
Where filter regulators work
From the machine inlet through the distribution level to the complete FRL unit – filter regulators condition compressed air exactly where it is needed.
Machine inlet / service unit
The filter regulator conditions compressed air directly at the machine inlet and sets the required working pressure.
Compressor and distribution level
As a central conditioning point upstream of distribution into individual branch lines.
Part of an FRL unit
Combined with a lubricator of Series L, the filter regulator forms a compact service unit – available as a complete assembly: MU201/FRL and MU301/FRL3 as well as Gold MU204/MU304.
Assembly and production lines
Consistent working pressure and clean air at pneumatically operated stations along the production line.
Systems with elevated cleanliness requirements
For finer air quality, the 5 µm stage FR04-M is complemented by micro-filter Series MF and activated carbon filter Series FI01-AC.
Rugged industrial environments
Metal housing versions such as the Gold FR04-M withstand higher mechanical stress at the installation point.
Buyer's Guide
How to select the right filter regulator
Filtration grade, port size and pressure range determine which series suits your compressed air application. This guide helps with configuration.
Design & Function
- Filter regulator or separate components
- A filter regulator combines both functions in a single housing, saving fittings, potential leak points and installation space. Separate components are worthwhile when the filter and regulator need to be located at different points or when high contamination loads are present.
- Secondary exhaust
- Allows precise reduction of outlet pressure without venting the system.
- Semi-automatic drain valve
- Drains condensate automatically without manual intervention.
- Bowl type
- Plastic bowl with protective guard (FR01/FR) or metal bowl (Gold FR04-M), depending on mechanical stress requirements.
Sizing
- Filtration grade
- For general compressed air, the 20 µm grade (FR01/FR) is standard; for cleaner air, the 5 µm grade (FR04-M). For even finer requirements, there are micro-filter series MF and activated carbon filter series FI01-AC.
- Port size
- G1/4, G3/8, G1/2 or G1 – matched to pipe cross-section and required flow rate. An undersized port creates pressure drop.
- Pressure range
- 0.5…8 bar (FR01/FR) or 0.5…10 bar (FR04-M). The working pressure must fall within this range; the upstream pressure must not exceed the maximum value.
- Flow rate
- Use the flow rate value in Nl/min of the respective variant to avoid pressure drop.
Availability & Service
Variants, Availability and Consultation
Filter pressure regulators are available in numerous variants by port size, filter grade, bowl type, and pressure range. Availability depends on the series and configuration selected.
Availability by Variant
Current availability and delivery times are shown on the respective product page or available on request.
Extensive Product Range
Standard port sizes, variants with pressure gauge (FR04-P), and compact sizes (FR04-M) — all from one source.
Advice on custom configurations
For larger quantities or special configurations, our sales team will assist you in selecting the right series.
Frequently Asked Questions
Filter regulators – frequently asked questions
Answers on function, selection and integration into compressed air maintenance.
What is a filter regulator?
A filter regulator is a compressed air component that combines a filter and a pressure regulator in a single housing. It removes condensate and particles from the compressed air while maintaining the set outlet pressure at a constant level.
What is the difference between a filter regulator and a pressure regulator?
A standalone pressure regulator controls pressure only; a filter regulator also handles air filtration. Where the air is already filtered, a pressure regulator (e.g. Series RE01/R) is sufficient; where conditioning and regulation are both required, the filter regulator is the space-saving solution.
What filter grades do STASTO filter regulators offer?
The FR01/FR series works with a 20 µm filter element, the Gold Series FR04-M with 5 µm. Further grades for each variant can be found on the respective product page.
What port sizes are available?
Filter regulators are available in common port sizes from G1/4 to G1. Exact availability depends on series and variant and is shown on the respective product page.
Is the filter regulator part of a service unit?
Yes. Combined with a lubricator, it forms an FRL service unit. STASTO offers complete units in the MU201/FRL and MU301/FRL3 series as well as the Gold variants MU204/MU304.
What pressure range do the series cover?
The adjustable pressure range is 0.5…8 bar (FR01/FR) and 0.5…10 bar (FR04-M). The required working pressure must be within this range; the inlet pressure must not exceed the respective maximum value (16 or 25 bar).
Related Products
Related Categories for Compressed Air Maintenance
Complement your filter pressure regulator with complete service units, additional regulators, or finer filter stages.
Configure now
Find the right filter regulator
Select series, port size and filter grade – or let our engineering team advise you. We'll help you configure the right variant for your compressed air application.