Johnson Controls A-4000-139 Valve Station

The Johnson Controls A-4000-139 is a single-stage pressure reducing valve station engineered for pneumatic control systems requiring high-purity air delivery. Rated for a 10 scfm flow capacity, this station integrates a 4-way bypass valve that allows for seamless filter maintenance without system downtime. This assembly is critical for protecting downstream pneumatic components by utilizing a coalescing filter to remove oil aerosols and an activated charcoal filter to eliminate oil vapors and odors. Designed for durability in industrial HVAC environments, the A-4000-139 ensures precise pressure regulation and maintains instrument-quality air standards. The compact configuration simplifies pneumatic control system installations while providing a robust interface for compressed air filtration and pressure management. By preventing oil contamination within control lines, technicians can ensure more reliable calibration and longer service life for actuators and controllers.

Key Technical Benefits

• High-Efficiency Filtration: Dual-stage filtration removes 99.9% of oil particles and vapors to prevent pneumatic line fouling.
• 10 SCFM Throughput: Optimized for mid-sized pneumatic networks requiring consistent pressure and flow.
• Integrated Bypass: The bypass valve assembly permits filter element replacement without depressurizing the entire control loop.
• Pressure Regulation: Maintains stable output pressure despite fluctuations in the primary air supply.
• Rugged Construction: Built to withstand the environmental demands of mechanical rooms and industrial plants.

Common Questions

What is the primary function of the 4-way bypass valve on the A-4000-139?
The bypass valve allows the technician to reroute air flow around the filter bowls. This is essential for performing maintenance or changing filter elements while the system remains operational, ensuring no loss of control air to the facility.

How do the coalescing and charcoal filters differ in this station?
The coalescing filter is designed to trap liquid oil and sub-micron particles, while the activated charcoal filter absorbs oil vapors. Using both ensures that the compressed air is free of contaminants that could damage sensitive pneumatic HVAC controls.

Can this valve station be mounted in any orientation?
For proper drainage of filtered contaminants and oil, the station should be mounted vertically with the filter bowls facing downward. This ensures the oil removing filters function correctly and the manual or automatic drains can be accessed easily.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.