Festo LR-1/4-D-MIDI-MPA Pressure Regulator

Technical Overview

The Festo 8002368 LR-1/4-D-MIDI-MPA is a high-performance, directly controlled diaphragm pressure regulator belonging to the D-series (Midi size). Designed to maintain constant output pressure with primary pressure compensation and secondary exhaust, it delivers a standard nominal flow rate of 2,100 l/min. The unit handles operating pressures up to 16 bar and provides a precise regulation range of 0.5 to 12 bar. It features a robust zinc die-cast housing, G1/4 pneumatic connections, and an integrated MPA scale pressure gauge. Ideal for industrial compressed air and inert gas applications requiring reliable flow control and moderate corrosion resistance.

Key Features

Directly controlled diaphragm regulator design for precise pressure control [1.3]
Maintains constant output pressure with primary pressure compensation and secondary exhaust
Wide operating pressure range up to 16 bar with a regulation range of 0.5 to 12 bar
Generous nominal flow rate of 2,100 l/min suitable for demanding industrial pneumatic circuits
Robust zinc die-cast housing and connecting plate with NBR seals for maximum durability
Rotary knob with integrated lock for secure pressure setting adjustments
Equipped with a pressure gauge (MPA scale) for convenient monitoring
Compatible with compressed air (ISO 8573-1:2010 [7:4:4]) and inert gases

Technical Specification Matrix

Parameter	Value
Size	Midi
Series	D
Actuator Lock	Rotary knob with lock
Assembly Position	Any
Design Structure	Directly controlled diaphragm regulator
Controller Function	Constant output pressure, with primary pressure compensation, with secondary exhaust
Pressure Indicator	Pressure gauge (MPa scale)
Operating Pressure	0 to 16 bar
Pressure Regulation Range	0.5 to 12 bar
Max Pressure Hysteresis	0.2 bar
Standard Nominal Flow Rate	2,100 l/min
Operating Medium	Compressed air to ISO 8573-1:2010 [7:4:4]; Inert gases
Corrosion Resistance Class (CRC)	2 - Moderate corrosion stress
Ambient / Medium Temperature	-10 to 60 °C
Product Weight	720 g
Pneumatic Connection 1 & 2	G1/4
Material of Housing / Connecting Plate	Zinc die-casting
Material of Seals	NBR

Industrial Applications

1. Automated Packaging Machine Pneumatic Control

In automated packaging systems, maintaining a consistent air pressure is critical for the reliable operation of pneumatic actuators and grippers. Variations in primary supply pressure can cause inconsistent force application, damaging fragile goods or causing machine jams.

Problem Solved

The LR-1/4-D-MIDI-MPA provides primary pressure compensation and a stable secondary pressure, ensuring that pneumatic actuators receive a consistent force even if the main factory air supply fluctuates. Its high flow rate of 2,100 l/min easily handles the rapid cycling demands of packaging machinery.

Primary Pressure CompensationDirectly Controlled Diaphragm2,100 l/min Nominal Flow0.5 to 12 bar Regulation

2. Machine Tool Equipment Maintenance and Tooling

Machine tools often require dedicated compressed air lines for tool changing mechanisms, swarf blow-off, or spindle purging. These subsystems need a controlled pressure level independent of the high-pressure main factory line to prevent tool damage and reduce air consumption.

Problem Solved

With a maximum operating pressure of 16 bar and an adjustable range of 0.5 to 12 bar, this pressure regulator drops the main line pressure down to the precise requirement of the machine tool. Its rotary knob with lock prevents accidental adjustments in harsh factory environments.

16 bar Operating PressureRotary Knob with LockZinc Die-cast HousingG1/4 Pneumatic Connection

3. Inert Gas Shielding Control in Welding Stations

Certain robotic welding or precision laser cutting operations use inert gases as shielding or assist gases. Controlling the flow and pressure of these gases accurately is vital to maintaining weld quality and preventing oxidation of the workpiece.

Problem Solved

This regulator is certified for use with inert gases as well as compressed air. The integrated pressure gauge and direct diaphragm control allow for fine-tuning of the gas pressure, while the NBR seals and moderate corrosion resistance (CRC 2) ensure longevity and leak-free operation.

Inert Gas CompatibleNBR SealsCRC 2 Corrosion ResistanceSecondary Exhaust