MS4-LR-1/4-D7-A4-AS – Pressure Regulator – Festo Compressed Air Regulator

USD $ 61.11

SKU: Festo 527690

Manufacturer Part Number: Festo 527690
Festo Compressed Air Regulator: MS4-LR-1/4-D7-A4-AS
OEM Spec Ref 

The Festo MS4-LR-1/4-D7-A4-AS, with MPN 527690, is a high-performance compressed air regulator engineered to enhance the efficiency and reliability of pneumatic systems. This precision device is essential for maintaining controlled and stable air pressure across a variety of industrial applications.

Key Features:

  • Precision Air Regulation: Tailored to deliver precise control of air pressure, this regulator ensures optimal conditions are maintained, achieving superior performance and consistency in pneumatic systems.
  • Durable Construction: Made with premium materials, the MS4-LR-1/4-D7-A4-AS is built to endure the demanding environments of industrial settings, ensuring durability and longevity.
  • Compact and Functional Design: Designed for flexibility in installation, its compact structure allows for easy integration into limited spaces without compromising on performance.
  • User-Friendly Adjustment: It features an intuitive adjustment mechanism that allows for quick and precise pressure modifications, facilitating easy system calibration.
  • Versatile Compatibility: Compatible with a diverse array of pneumatic setups, it can be seamlessly integrated into existing systems, enhancing adaptability in system design.


  • Enhanced System Efficiency: By maintaining optimal pressure levels, this regulator contributes to the improved efficiency and reliability of pneumatic operations, boosting overall system performance.
  • Reduced Operational Costs: Optimizing pressure settings helps reduce energy consumption, leading to lower operational costs and enhanced economic efficiency.
  • Extended Equipment Life: Proper air pressure regulation minimizes wear on pneumatic components, extending their lifespan and reducing the frequency of maintenance.
  • Increased Safety: Reliable and consistent air pressure control promotes safer operations within pneumatic systems, adhering to rigorous safety standards.


  • Industrial Manufacturing: Vital for ensuring precise air pressure in automated production lines, which is crucial for maintaining high-quality manufacturing outputs.
  • Pneumatic Control Systems: Plays an integral role in systems where accurate and stable pressure is essential for proper operation.
  • Testing and Inspection: Ideal for use in systems requiring consistent air pressure for precise testing and diagnostic procedures.
  • General Pneumatics: Suitable for a wide range of applications in various industries, ensuring operational precision and reliability.

The Festo MS4-LR-1/4-D7-A4-AS Compressed Air Regulator exemplifies Festo’s commitment to innovation in pneumatic technology, offering a robust solution for effective management of air pressure and enhancing the performance of industrial processes.

Technical Data

Feature Specification
Size 4
Series MS
Actuator Lock Rotary knob with detent
Rotary knob with integrated lock
can be closed with accessories
Mounting Position Any
Structural Design Pressure regulator with pressure gauge
Controller Function Outlet pressure constant
With secondary exhausting
With return flow function
Pressure Gauge G1/4 prepared
G1/8 prepared
with pressure sensor
with pressure gauge
Operating Pressure 0.08 MPa … 1.4 MPa
Operating Pressure 0.8 bar … 14 bar
Pressure Regulation Range 0.3 bar … 12 bar
Max. Pressure Hysteresis 0.025 MPa
Max. Pressure Hysteresis 0.25 bar
Max. Pressure Hysteresis 3.625 psi
Standard Nominal Flow Rate 1000 l/min … 2200 l/min
Certification c UL us – Recognized (OL)
CE marking (see declaration of conformity) as per EU explosion protection directive (ATEX)
UKCA marking (see declaration of conformity) acc. to UK EX instructions
Explosion Protection Certification EPL Db (GB)
Explosion Prevention and Protection Zones Zone 1 (ATEX)
Zone 1 (UKEX)
Zone 2 (ATEX)
Zone 21 (ATEX)
Zone 21 (UKEX)
Zone 22 (ATEX)
ATEX category gas II 2G
ATEX category for dust II 2D
Type of ignition protection for gas Ex h IIC T6 Gb X
Type of (ignition) protection for dust Ex h IIIC T60°C Db X
Explosive Ambient Temperature -10°C <= Ta <= +60°C
Operating Medium Compressed air as per ISO 8573-1:2010 [7:4:4], Inert gas
Information on operating and pilot media Operation with oil lubrication possible (required for further use)
Corrosion resistance class (CRC) 2 – Moderate corrosion stress
LABS (PWIS) conformity VDMA24364-B1/B2-L
Storage temperature -10 °C … 60 °C
For use in the food industry See supplementary material information
Temperature of medium -10 °C … 60 °C
Ambient temperature -10 °C … 60 °C
Product weight 225 g
Type of mounting Optionally:
Front panel mounting
Line installation
With accessories
Note on materials RoHS-compliant
Material of sub-base Die-cast aluminum
Seals material NBR
Housing material Die-cast aluminum
Diaphragm material NBR