Festo LFR-3/8-D-MIDI-KA-A Pneumatic Service Unit Combination

Technical Overview

The Festo 185714 (LFR-3/8-D-MIDI-KA-A) is a highly robust service unit combination from the D-series, intelligently integrating a filter regulator and branching distributor module. Engineered for demanding pneumatic control and inert gas applications, it delivers a standard nominal flow rate of 2620 l/min via standard G3/8 pneumatic connections. The device offers an exceptionally precise pressure regulation range of 0.5 to 12 bar, operating at line pressures up to 12 bar with a maximum hysteresis of just 0.2 bar. To guarantee supreme air purity, it is equipped with a 40 µm filtration element and a fully automatic condensate drain capable of handling up to 43 ml of fluid. Housed in a durable die-cast zinc body with a polycarbonate bowl and metal bowl guard, the unit conforms to ISO 8573-1:2010 standards and PWIS conformity, making it ideal for high-vibration, vertically mounted (+/- 5°) industrial settings.

Key Features

Midi size, D-series architecture
Branching module and filter regulator with analog pressure gauge
Rotary knob with detent actuator lock to prevent accidental adjustments
40 µm grade of filtration with fully automatic condensate drain (43 ml max volume)
Die-cast zinc housing with PC bowl and heavy-duty metal bowl guard
Compatible with both compressed air (ISO 8573-1:2010) and inert gases

Technical Specification Matrix

Parameter	Value
Pneumatic Connection	G3/8 (Ports 1 and 2)
Standard Nominal Flow Rate	2620 l/min
Operating Pressure	2 to 12 bar (0.2 to 1.2 MPa)
Pressure Regulation Range	0.5 to 12 bar (0.05 to 1.2 MPa)
Max. Pressure Hysteresis	0.2 bar
Grade of Filtration	40 µm
Max. Condensate Volume	43 ml
Condensate Drain	Fully automatic
Ambient/Media Temperature	-10 °C to 60 °C
Housing Material	Die-cast zinc
Operating Medium	Compressed air (ISO 8573-1:2010 [7:8:4]), Inert gases

Industrial Applications

1. Automated Manufacturing Pneumatic Networks

In high-throughput manufacturing lines, stable and clean compressed air is critical for valve and pneumatic cylinder longevity.

Problem Solved

Unfiltered moisture and pressure spikes cause premature wear on pneumatic actuators. The fully automatic condensate drain and 40 µm filtration grade ensure dry, clean air, while the 0.5-12 bar regulation range maintains exact operating pressure to prevent mechanical stalling.

40 µm filtrationautomatic condensate drain0.5-12 bar regulationpneumatic actuators

2. Packaging Machinery Multi-line Distribution

Complex packaging machines often require a single main air supply to be split safely across multiple parallel pneumatic subsystems.

Problem Solved

Standard regulators lack integrated splitting capabilities, requiring extra manifolds. The built-in branching module design distributes the 2620 l/min standard nominal flow efficiently across multiple circuits, while the rotary knob with detent lock prevents accidental pressure changes from machine vibration.

branching module2620 l/min flow ratedetent actuator lockmanifold distribution

3. Inert Gas Blanketing in Food Processing

Food processing and packaging facilities frequently require inert gas environments to prevent oxidation and extend product shelf life.

Problem Solved

Gas blanketing applications require precise flow control and fully compatible regulators. This unit is explicitly rated for inert gases, features a robust die-cast zinc housing, and handles ambient temperatures from -10 °C to 60 °C, ensuring highly reliable gas pressure management.

inert gasesdie-cast zinc housing-10 °C to 60 °Cgas blanketing