Lear Siegler Truck Products Corp. has improved the design of their Neway height control valve (HCV) for use with truck, bus, and trailer air suspensions. This improvement applies a patented method for developing the time delay feature.Air suspension applications in the commercial, military, and recreational segments of the vehicle market have recorded sustained growth. Vehicle air suspensions as well as air suspended cabs, seats, and kingpins are increasingly specified options.At least one HCV is required on every air suspension system. The HCV will automatically control the design height reliably for several years.The main objectives for the valve improvements were: to increase durability, reduce sensitivity to misinstallation, and improve manufacturability. This paper will deal with the design, development, and testing of the improved Neway HCV.