Apparatus for equalizing pressure between two conduits including means for sensing pressure in said conduits; valve means communicating between said conduits, said valve means adapted to open so as to equalize pressure between said conduits.
A vehicle lift control maintains multiple points of a lift system within the same horizontal plane during vertical movement of the lift engagement structure by synchronizing the movement thereof. A vertical trajectory is compared to actual positions to generate a raise signal. A position synchronization circuit synchronizes the vertical actuation of the moveable lift components by determining a proportional-integral error signal.
