Hydraulic fluid under pressure, admitted through connection 1, passes through throttling devices 2, consisting of a set of washers of equal resistance, and ports a into sleeve 3 at both ends of floating plunger 4. Plunger 4, subject to equal fluid pressures, is positioned between ports d, through which fluid is delivered to the brake grid control cylinders. If one of the grids is jammed or the friction is unequal in their mechanism, the two rates of fluid flow become unequal, and the pressure drops at the side of greater flow. This shifts pluniger 4 toward this side and it closes ports d to some extent, admitting less fluid until the pressure is equalized at both ends. Plunger 4 has extensions of smaller diameter at both ends to prevent it from completely blocking off ports d.
$4269$CHP,Rg$