Product Overview
The FESTO MS4-LR-1/8-D6-A8 is a precision pneumatic pressure regulator from the FESTO MS4 series modular air preparation system. This regulator is a diaphragm-type pressure control valve designed to maintain a constant, accurately regulated downstream working pressure regardless of fluctuations in upstream supply pressure or changes in flow demand. As a core component within FESTO’s MS series air service units, it serves as a critical control element in compressed air networks, ensuring stable actuation pressure for downstream pneumatic cylinders, valves, and automation devices. The unit features a lockable adjusting knob and is engineered for panel or inline mounting within modular MS4 combination units.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pneumatic Pressure Regulator Valve (Diaphragm Type) |
| Model Designation | MS4-LR-1/8-D6-A8 |
| Series | FESTO MS4 Modular Air Preparation Series |
| Port Connection | G1/8 (1/8″ BSPP) threaded ports |
| Operating Pressure | Standard Industrial Grade (up to 16 bar inlet) |
| Regulated Output Range | Adjustable secondary pressure via lockable rotary knob |
| Mounting & Connection | Modular MS4 inline / panel mount interface |
| Media | Compressed air (filtered, lubricated or non-lubricated) |
Engineering Features & Advantages
- Precision Pressure Regulation: Diaphragm-controlled design delivers highly accurate and repeatable secondary pressure, minimizing hysteresis and maintaining stable output even under varying flow conditions.
- Lockable Adjusting Knob: Integrated locking mechanism prevents unauthorized tampering with the set pressure, ensuring process consistency in critical pneumatic circuits.
- Modular System Integration: Designed for seamless combination with other FESTO MS4 series components (filters, lubricators, soft-start valves) for a compact, fully integrated air preparation unit.
- Industrial Reliability: Built for continuous operation under severe industrial conditions with robust housing and high-quality diaphragm materials.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original FESTO OEM standards for drop-in service and maintenance.
Typical Industrial Applications
This FESTO MS4-LR-1/8-D6-A8 pressure regulator is widely deployed in pneumatic control systems across plastic injection molding machines, packaging and assembly automation lines, CNC machine tools, and general factory automation. It is also commonly used in food and beverage processing equipment, pharmaceutical production lines, and textile machinery where precise, stable compressed air pressure is essential for consistent actuator performance and product quality.
PRODUCT IMAGES


FESTO MS4-LR-1/8-D6-A8 Pneumatic Pressure Regulator
⚡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine FESTO MS4-LR-1/8-D6-A8 Pneumatic Regulator. This Germany-made precision regulator features a reliable pressure control design, delivering leak-free, consistent air flow for heavy-duty industrial automation systems.