Patent ID: 7722131
Filing Date: 2010-05-25
Classification: B60T,F04B

Abstract:
1. A control for a hydraulic circuit comprising: a manifold housing in fluid communication with an associated spring applied-pressure released brake and an associated pump; and a movable member disposed in the housing and movable between a first operating position and a second operating position when pressure is not being applied from the associated pump to the housing, in the first operating position the movable member being disposed to allow fluid communication between the associated pump and the associated brake, in the second operating position the movable member being disposed to prohibit fluid communication through the control from upstream the associated brake toward the associated pump while allowing fluid communication through the control from upstream the associated pump toward the associated brake in a second direction, wherein the movable member comprises a first member and a second member, the first member having a cavity that receives the second member and the second member being movable in relation to the first member when pressure is not being applied to the housing from the associated pump.