25154436
Pneumatic Valve Assembly
Mack

This pneumatic valve assembly is the heart of the air system control, regulating the flow and pressure of compressed air to braking and auxiliary circuits. Engineered for harsh vibration, temperature swings, and demanding duty cycles, the unit combines a durable body, a precise internal spool or diaphragm mechanism, seals, and mounting interfaces that ensure repeatable performance. A well-functioning valve maintains accurate cut-in and cut-out pressures, enabling timely brake application, reduced brake lag, and improved overall vehicle safety. The design tolerances support long service life, minimizing leakage and reducing energy waste from the compressor. Quick, secure field service is aided by modular seals and standard connectors, allowing technicians to replace the valve without disassembling adjacent components. Paying attention to port sizing and compatible control signals helps avoid over-pressurization or under-pressurization of systems, which can compromise performance in cold starts or high-altitude operation. Value comes from reliability, consistent response times, and reduced maintenance cycles. Source One Parts Center.