Abstract: A lift axle control valve (200) for controlling a vehicle lift axle is provided. The valve (200) includes a vehicle port (103) configured to receive a vehicle pressure and a suspension port (106) configured to receive a suspension pressure. The valve (200) is configured to receive a lift axle control signal, actuate the lift axle control valve (200) to connect one or more lift bag output ports (121) to the vehicle port (103) and to connect one or more load bag output ports (131) to the vent port (118) if the lift axle control signal comprises a lift command, and actuate the lift axle control valve (200) to connect the one or more load bag output ports (131) to the suspension port (106) and connect the one or more lift bag output ports (121) to the vent port (118) if the lift axle control signal comprises a load command.

Abstract: A pneumatic valve (100) including a first port (150) and a second port (155) is provided according to the invention. The pneumatic valve (100) includes a valve mechanism (101) in fluidic communication with the first port (150) and the second port (155). The valve mechanism (101) is configured to receive a pneumatic control signal via the first port (150) and advance to a next valve actuation state of a plurality of predetermined valve actuation states upon receipt of the pneumatic control signal. The plurality of predetermined valve actuation states provides a plurality of predetermined flow profiles between the first port (150) and the second port (155).

Abstract: A lift axle control valve (200) for controlling a vehicle lift axle is provided. The valve (200) includes a vehicle port (103) configured to receive a vehicle pressure and a suspension port (106) configured to receive a suspension pressure. The valve (200) is configured to receive a lift axle control signal, actuate the lift axle control valve (200) to connect one or more lift bag output ports (121) to the vehicle port (103) and to connect one or more load bag output ports (131) to the vent port (118) if the lift axle control signal comprises a lift command, and actuate the lift axle control valve (200) to connect the one or more load bag output ports (131) to the suspension port (106) and connect the one or more lift bag output ports (121) to the vent port (118) if the lift axle control signal comprises a load command.