Festo LR-1/4-D-7-I-MINI-MPA Pressure Regulator

Technical Overview

The Festo LR-1/4-D-7-I-MINI-MPA (part number 8002391) is a high-performance, directly actuated diaphragm pressure regulator from the D series, Mini size. It features standard G1/4 pneumatic connections and an integrated analog pressure gauge indicating MPa. Engineered for precision and stability in pneumatic systems, it delivers constant output pressure via primary pressure compensation, secondary venting, and a return flow function. The regulator accommodates input supply pressures ranging from 1 to 16 bar and smoothly regulates output pressure between 0.5 and 7 bar. It provides a substantial standard nominal flow rate of 1,600 l/min, accommodating high-demand pneumatic circuits. Constructed with a robust die-cast zinc housing and NBR seals, it ensures high reliability in industrial automation applications utilizing compressed air or inert gases within a temperature range of -10 °C to +60 °C.

Key Features

Directly actuated diaphragm regulator design for rapid response times.
Maintains constant output pressure with primary pressure compensation and secondary venting.
Integrated analog pressure gauge (MPa scale) for direct visual monitoring.
Secure rotary knob actuator lock with detent prevents accidental pressure adjustments.
Wide operating pressure range from 1 bar up to 16 bar (0.1 MPa to 1.6 MPa).
Compatible with compressed air (ISO 8573-1:2010 [7:4:4]) and inert gases.
Rugged die-cast zinc housing paired with durable NBR seals.

Technical Specification Matrix

Parameter	Value
Size	Mini
Series	D
Pneumatic Connection 1 & 2	G1/4
Design	Directly actuated diaphragm regulator
Operating Pressure Range	1 bar to 16 bar (0.1 MPa to 1.6 MPa)
Pressure Regulation Range	0.5 bar to 7 bar
Standard Nominal Flow Rate	1,600 l/min
Max. Pressure Hysteresis	0.2 bar
Medium Temperature Range	-10 °C to +60 °C
Ambient Temperature Range	-10 °C to +60 °C
Housing Material	Die-cast zinc
Seals Material	NBR
Product Weight	350 g

Industrial Applications

1. Pneumatic Actuator Control in Automated Packaging Lines

Automated packaging systems rely on pneumatic cylinders for precise material handling, folding, and carton forming operations. The Festo LR-1/4-D-7-I-MINI-MPA regulates supply pressure reliably between 0.5 and 7 bar, ensuring the actuators apply the exact required mechanical force. Its high nominal flow rate of 1,600 l/min easily supports high-speed pneumatic cycling.

Problem Solved

Eliminates inconsistent actuator extension forces caused by fluctuating upstream air pressure, mitigating product damage and reducing machine jamming.

Primary pressure compensation1,600 l/min flow rateConstant output pressureDiaphragm regulator

2. Precision Shielding Gas Delivery in Robotic Welding Cells

In automated TIG or MIG welding stations, a highly stable flow of shielding gas is critical to maintaining a defect-free weld pool. Since this regulator is fully compatible with inert gases and features an extremely low pressure hysteresis of 0.2 bar, it can precisely dial down bulk gas lines into an optimal, low-pressure delivery stream. The secondary venting quickly adapts if lower pressure thresholds are required.

Problem Solved

Prevents shielding gas flow surges or starvation that would otherwise lead to weld porosity and oxidation defects.

Inert gas compatible0.2 bar maximum hysteresisSecondary ventingDirectly actuated

3. Air Supply Regulation for High-Torque Pneumatic Tooling Stations

Assembly stations utilizing handheld or robotic pneumatic nutrunners and drivers require steady air pressure to achieve accurate torque application. Tapping into standard 10-12 bar facility compressed air, this G1/4 Mini regulator steps the pressure down to a safe, constant working pressure up to 7 bar. The return flow function protects equipment when circuits are suddenly de-energized.

Problem Solved

Solves pneumatic motor RPM variations and torque inaccuracies by delivering stabilized high-volume air despite shifting factory compressor loads.

1 to 16 bar operating pressureReturn flow functionG1/4 connectionDie-cast zinc housing