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.