Johnson Controls A-4000-144 Relief Valve

The Johnson Controls A-4000-144 is a professional-grade safety relief valve designed specifically for pneumatic control systems and air compressor accessories. Featuring a 1/4" NPT male connection, this pop-type valve is factory-set to activate at 25 PSIG, providing a critical mechanical failsafe against overpressurization in the supply line. The robust brass body construction ensures durability and corrosion resistance, essential for maintaining the integrity of oil removal and pressure reducing stations. With a maximum flow capacity of 25 SCFM, the A-4000-144 is engineered to vent excess pressure rapidly, protecting downstream gauges and sensitive pneumatic components from damage. This non-ASME coded relief valve is a standard component in the A-4000 series pressure reducing stations, acting as the final line of defense for your compressed air infrastructure. Technicians should ensure the 1/4 inch relief valve is installed in an upright position to prevent debris accumulation on the seat, maintaining a reliable seal for long-term system stability.

• Factory-Set Protection: Calibrated to 25 PSI for precise overpressure venting in low-pressure pneumatic circuits.
• Industrial Construction: Heavy-duty brass safety valve housing resists environmental degradation and mechanical wear.
• High Flow Capacity: Handles up to 25 SCFM to quickly stabilize system pressure during surges.
• Standard Compatibility: The 1/4" NPT threaded inlet allows for easy integration into existing manifolds and pressure stations.
• Compact Profile: Ideal for tight installations within Johnson Controls A-4000 series assemblies.

When should the A-4000-144 be replaced?
If you notice consistent air leakage below the 25 PSIG set point or if the valve fails to pop during a controlled pressure test, the internal spring or seat may be compromised by oil aerosols or debris.

Is this valve compatible with other set pressures?
While the A-4000-144 is fixed at 25 PSIG, the system gauge scales can be adjusted if the safety relief valve is matched to the specific requirements of the downstream pneumatic equipment.

Can this be used in steam applications?
No, this is a pneumatic relief valve designed specifically for compressed air systems. Using it in steam or liquid applications will cause premature failure and safety risks.

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.