LR-3-8-D-I-MIDI Festo Pressure Regulator

USD 89.44

High-performance pressure regulator with return flow function. Offers precise 0.5–12 bar control, NBR seals, and die-cast zinc housing for durable air systems.

SKU Festo-192312 Category
Pressure Regulators

LR-3/8-D-I-MIDI Festo Pressure regulator

Model Identifier LR-3/8-D-I-MIDI
Official Part Number 192312
GTIN Standard 4052568079390

Technical Overview

The Festo LR-3/8-D-I-MIDI is a Midi-sized, directly actuated diaphragm pressure regulator from the D series, designed to provide high-stability pressure control for compressed air and inert gases. It ensures a constant output pressure through primary pressure compensation and features integrated secondary venting alongside a return flow function. Constructed with a die-cast zinc housing and NBR seals, it includes an analog pressure gauge and a rotary knob with detent for actuator locking. It supports a regulation range from 0.5 to 12 bar with a standard nominal flow rate of 3200 l/min.

Key Features

  • Actuator lock: Rotary knob with detent
  • Directly actuated diaphragm regulator design
  • Primary pressure compensation for constant output pressure
  • Integrated secondary venting
  • Integrated return flow function
  • Equipped with analog pressure gauge
  • Midi size, Series D
  • RoHS-compliant materials

Primary pressure compensation maintains constant output pressure despite fluctuations in supply pressure.

Technical Specification Matrix

ParameterValue
SizeMidi
SeriesD
Actuator lockRotary knob with detent
Mounting positionoptional
DesignDirectly actuated diaphragm regulator
Controller functionOutput pressure constant Via primary pressure compensation With secondary venting With return flow function
Symbol00991558
Pressure gauge (ANALOG) or Pressure display (DIGITAL)With pressure gauge
Operating pressure (MPa)0 MPa ... 1.6 MPa
Operating pressure (bar)0 bar ... 16 bar
Pressure regulation range0.5 bar ... 12 bar
Max. pressure hysteresis (MPa)0.02 MPa
Max. pressure hysteresis (bar)0.2 bar
Max. pressure hysteresis (psi)2.9 psi
Standard nominal flow rate (standardised to DIN 1343)3200 l/min
Operating mediumCompressed air to ISO 8573-1:2010 [7:4:4] Inert gases
Note on operating and pilot mediumLubricated operation possible (in which case lubricated operation will always be required)
LABS (PWIS) conformityVDMA24364-B1/B2-L
Air purity class at outputCompressed air to ISO 8573-1:2010 [7:4:4] Inert gases
Media temperature-10 °C ... 60 °C
Ambient temperature-10 °C ... 60 °C
Product weight720 g
Type of mountingWith accessories
Pneumatic connection, port 1G3/8
Pneumatic connection, port 2G3/8
Note on materialsRoHS-compliant
Material sub-baseDie-cast zinc
Material sealsNBR
Material housingDie-cast zinc

Industrial Applications

1. High-Speed Pneumatic Actuation in Automated Packaging Lines

Integrating the Festo MIDI regulator into the main air preparation station of a high-speed blister packaging machine to distribute compressed air to multiple pick-and-place and sealing pneumatic cylinders.

Problem Solved

Prevents downstream pressure drops and inconsistent cylinder actuation speeds when multiple pneumatic devices fire simultaneously. The primary pressure compensation and high standard nominal flow rate of 3200 l/min ensure a stable operating pressure, eliminating incomplete seals or damaged packaging.

3200 l/min standard nominal flow ratePrimary pressure compensationDirectly actuated diaphragm regulatorMax. pressure hysteresis 0.2 bar

2. Precision Workholding in CNC Machining Centers

Regulating the shop-floor compressed air supplied to pneumatic toggle clamps and zero-point workholding fixtures inside a 5-axis CNC milling machine.

Problem Solved

Eliminates part deformation and slippage during machining. The 0.5 bar to 12 bar pressure regulation range allows operators to dial in the exact clamping force needed for delicate, thin-walled components, while the robust die-cast zinc housing and NBR seals withstand the harsh, debris-heavy environment of a machine shop.

0.5 bar ... 12 bar pressure regulation rangeDie-cast zinc housingNBR sealsRotary knob with detent

3. Inert Gas Supply Regulation for Robotic Welding Cells

Acting as a secondary point-of-use regulator to control the pressure of inert shielding gases (such as Argon mixtures) delivered from a centralized manifold to an automated robotic welding arm.

Problem Solved

Overcomes weld defects (like porosity or oxidation) caused by inconsistent shielding gas coverage. The regulator's certified compatibility with inert gases, combined with its exceptionally low max pressure hysteresis (0.02 MPa) and secondary venting capability, maintains a perfectly stable gas envelope over the weld pool despite supply line fluctuations.

Inert gases compatibleMax. pressure hysteresis 0.02 MPaSecondary ventingG3/8 pneumatic connection

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