LR-1/8-D-MINI-MPA Festo Pressure Regulator

Technical Overview

The Festo LR-1/8-D-MINI-MPA is a high-performance, directly actuated diaphragm pressure regulator from the D-Series. Designed for precise compressed air preparation, it features primary pressure compensation to maintain constant output pressure despite inlet variations and incorporates secondary venting for safety. This Mini-sized unit includes a rotary knob with detent for secure adjustment and comes equipped with an integrated analog pressure gauge, suitable for moderate corrosion environments (CRC 2).

Key Features

Rotary knob with detent actuator lock
Directly actuated diaphragm regulator design
Output pressure constant via primary pressure compensation
Secondary venting for exhaust capability
Equipped with analog pressure gauge
Optional mounting position
RoHS-compliant material construction
Suitable for lubricated operation
Moderate corrosion resistance class (CRC 2)

Technical Specification Matrix

Parameter	Value
Size	Mini
Series	D
Actuator lock	Rotary knob with detent
Mounting position	optional
Design	Directly actuated diaphragm regulator
Controller function	Output pressure constant, Via primary pressure compensation, With secondary venting
Symbol	00991538
Pressure gauge (ANALOG) or Pressure display (DIGITAL)	With pressure gauge
Operating pressure (MPa)	0.1 MPa ... 1.6 MPa
Operating pressure (bar)	1 bar ... 16 bar
Pressure regulation range	0.5 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)	800 l/min
Operating medium	Compressed air to ISO 8573-1:2010 [7:4:4], Inert gases
Note on operating and pilot medium	Lubricated operation possible (in which case lubricated operation will always be required)
Corrosion resistance class CRC	2 - Moderate corrosion stress
LABS (PWIS) conformity	VDMA24364-B1/B2-L
Air purity class at output	Compressed air to ISO 8573-1:2010 [7:4:4], Inert gases
Media temperature	-10 °C ... 60 °C
Ambient temperature	-10 °C ... 60 °C
Product weight	350 g
Type of mounting	With accessories
Pneumatic connection, port 1	G1/8
Pneumatic connection, port 2	G1/8
Note on materials	RoHS-compliant
Material sub-base	Die-cast zinc
Material seals	NBR
Material housing	Die-cast zinc

Industrial Applications

1. Paint Spray Gun Air Pressure Regulation in Automotive Assembly

Integration of the Festo LR-1/8-D-MINI-MPA pressure regulator into the pneumatic supply manifolds for automated robotic paint spray guns to maintain exact atomization pressure.

Problem Solved

Prevents paint surface defects like fish-eyes and cratering by utilizing completely silicone-free, PWIS-compliant components, while the tight 0.2 bar maximum pressure hysteresis prevents uneven paint application caused by supply pressure drops.

LABS (PWIS) conformityVDMA24364-B1/B2-LMax. pressure hysteresis (bar)Standard nominal flow rate 800 l/min

2. Precise Clamping Force Control in Compact Packaging Machinery

Mounting the mini-sized pressure regulator near the end-effectors of high-speed automated packaging and pick-and-place lines to control downstream pneumatic clamping cylinders.

Problem Solved

Solves the problem of severe spatial constraints in miniaturized automated cells while preventing the crushing of delicate goods by ensuring the output pressure remains constant via primary pressure compensation.

Size MiniPneumatic connection G1/8Controller functionPrimary pressure compensationOutput pressure constant

3. Inert Gas Shielding Control for Automated Laser Welding Cells

Utilizing the regulator to control the precise delivery pressure of inert shielding gases to the welding nozzle in an industrial automated laser welding environment.

Problem Solved

Eliminates weld pool oxidation and porosity by maintaining a stable, uninterrupted gas blanket, safely handling inert gases and offsetting any primary pressure fluctuations from the central gas supply across a wide temperature range.

Operating mediumInert gasesMedia temperature -10 C to 60 CWith secondary venting