Precise Regulation for Critical Pneumatic Circuits
The Festo MS4-LR-1/4-D6-E11 (part no. 8190237) is a directly controlled diaphragm regulator designed to maintain a constant outlet pressure with minimal hysteresis. Its pressure regulation range of 0.3 bar to 7 bar covers a wide spectrum of low-to-mid pressure applications, while the maximum pressure hysteresis of 3.625 psi ensures repeatable setpoint accuracy—critical for processes where even minor pressure drift can affect product quality. The regulator also features secondary exhausting and a return flow function, allowing it to vent downstream pressure quickly and handle reverse flow conditions without compromising performance.
With a standard nominal flow rate of 1800 l/min and an operating pressure range of 0.8 bar to 14 bar, this unit is well-suited for supply lines feeding multiple actuators or sensitive instrumentation. The G1/4 pneumatic connections on both ports simplify integration into existing piping, and the unit's compact size (Size 4) fits neatly into MS series modular systems.
Built for Harsh and Hygienic Environments
Constructed with a die-cast aluminum sub-base and housing, plus NBR seals and diaphragm, the MS4-LR-1/4-D6-E11 offers robust mechanical strength and chemical resistance. It operates reliably across a temperature range of -10 °C to 60 °C for ambient, medium, and storage conditions, making it suitable for unheated factory floors or warm enclosures. The corrosion resistance class of 2 (moderate corrosion stress) ensures durability in typical industrial atmospheres with occasional condensation or mild contaminants.
For industries with strict cleanliness requirements, this regulator conforms to VDMA24364-B1/B2-L (LABS/PWIS) and is RoHS-compliant. It is also noted as suitable for food industry use (refer to supplementary material for specific conditions), meaning it can be deployed in packaging, food processing, or pharmaceutical lines where silicone-free and low-emission components are mandatory.
Flexible Mounting and Secure Adjustment
Installation versatility is a key advantage of the MS4-LR-1/4-D6-E11. It supports front panel mounting, in-line installation, or mounting with accessories, and can be oriented in any position. This flexibility simplifies retrofits or new machine builds where space is constrained. The operator panel is made of aluminum, and the rotary knob includes an integrated lock—preventing accidental setpoint changes due to vibration or inadvertent contact. This is particularly valuable on equipment that undergoes frequent cleaning or where multiple operators interact with the same station.
The unit comes with a pressure gauge, allowing immediate visual verification of outlet pressure without additional instrumentation. This reduces commissioning time and simplifies troubleshooting during maintenance.
Operational Considerations for Engineers
When integrating this regulator, note that the operating medium must be compressed air per ISO 8573-1:2010 [7:4:4] or inert gas. If oil lubrication is used in the system, it is possible but must be continued for subsequent operation to avoid seal degradation. The regulator's design as a directly controlled diaphragm type means it responds quickly to downstream changes, but it is not a pilot-operated unit—so ensure the supply pressure is at least 0.8 bar above the desired setpoint to maintain regulation accuracy.
Weighing only 350 g, the MS4-LR-1/4-D6-E11 adds minimal load to panels or tubing. Its die-cast aluminum construction provides a good strength-to-weight ratio, and the NBR elastomers offer broad compatibility with standard industrial lubricants and cleaning agents.
Why Choose the MS4-LR-1/4-D6-E11
This regulator is an excellent choice for engineers seeking a balance of precision, durability, and compliance. Its ability to handle return flow and secondary exhausting makes it more versatile than simple pressure reducers, while the integrated pressure gauge and locking knob reduce ancillary component count. For procurement teams, the MS series compatibility ensures easy integration with other Festo components, and the RoHS and LABS conformity simplify global equipment certification.
Whether you are designing a new pneumatic system or upgrading an existing line, the MS4-LR-1/4-D6-E11 delivers consistent performance in a compact, corrosion-resistant package.