Hi-Low Unloading Valve
We have just shown how an unloading valve can be piped
into a system to provide unloading of the high volume pump. To complete this hi-low circuit,
it was necessary to in corporate two separate components, namely, an isolating
check valve and a high pressure low flow relief.
Assuming that the selected pumps and system requirements fall within
the performance capabilities of the valve, multiple components and
related piping can be replaced by a single component. As shown in
the cross-sectional illustration, this valve package consists of
a direct operated unloading valve, a high pressure relief, and an
isolating check valve. Pipe connections to the valve include high
volume pump, high pressure pump, system and tank return.
Above: A Rexroth Hi-Low Unloading Valve. Cross-section diagram
(See Color code legend for above image)
Thursday, November 27, 2008 17:49