Patent ID: 8025073

Claim:
A valve responsive to the incline of a supporting surface, said valve comprising: a valve body adapted for fixed attachment to a mounting surface having an orientation corresponding to the incline of the supporting surface, whereby the valve body assumes an orientation corresponding to the incline; a spool assembly comprising a spool pivotally mounted relative to the valve body; a pendulum assembly pivoting the spool in gravitational response to the orientation of the valve body to thereby situate the spool relative to the valve body among an IO position, sequential LIO positions whereat the valve body and the spool define enlarging LIO flowpaths, and sequential GIO positions whereat the valve body and the spool define enlarging GIO flowpaths; wherein at least one of the valve body, the spool assembly, and the pendulum assembly includes means for adjusting flow symmetry between the LIO flowpaths and the GIO flowpaths.