LSAS Valve Body

This LSAS system is designed to automatically drop one or more lift axles on a trailer when a load is sensed. This prevents overloading of the trailer's static (down) axles if the operator neglects to drop the lifted axles. The system monitors the load by sensing the pressure in the air suspension.

The axle(s) can be manually lowered at any time or raised when there is no load sensed. The axle(s) will automatically lower if attempts are made to raise them when a load is sensed.

The LSAS is all pneumatic and does not rely on electrical power to operate. It will not change modes (drop or lift) when the power circuit is non existent, faulty or the voltage drops.

An optional internal switch and harness set are available to illuminate a status lamp when the lift axle(s) are raised.

The deployment trigger reacts to pressure in the static (down) axle’s ride springs. Adjustment of the trigger pressure is accomplished by turning the adjustment screw located on the back of the valve. The adjustment range is from 25 to 75 psi. A security label is included to seal off the adjustment screw and indicate whether the adjustment level has been tampered with. The valve body can be mounted within an enclosure or outside if protected from heavy splash and contamination. It has excellent low temperature operational characteristics and features a trigger gain feature for extra security against false deployment.